Non-archimedean construction of elliptic curves and abelian surfaces - - PowerPoint PPT Presentation

non archimedean construction of elliptic curves and
SMART_READER_LITE
LIVE PREVIEW

Non-archimedean construction of elliptic curves and abelian surfaces - - PowerPoint PPT Presentation

Non-archimedean construction of elliptic curves and abelian surfaces ICERM WORKSHOP Modular Forms and Curves of Low Genus: Computational Aspects Xavier Guitart 1 Marc Masdeu 2 Mehmet Haluk Sengun 3 1 Universitat de Barcelona 2 University of


slide-1
SLIDE 1

Non-archimedean construction of elliptic curves and abelian surfaces

ICERM WORKSHOP Modular Forms and Curves of Low Genus:

Computational Aspects

Xavier Guitart 1 Marc Masdeu 2 Mehmet Haluk Sengun 3

1Universitat de Barcelona 2University of Warwick 3University of Sheffield

September 28th, 2015

Marc Masdeu Non-archimedean constructions September 28th, 2015 0 / 34

slide-2
SLIDE 2

Modular Forms and Curves of Low Genus: Computational Aspects

Xavier Guitart 1 Marc Masdeu 2 Mehmet Haluk Sengun 3

1Universitat de Barcelona 2University of Warwick 3University of Sheffield

September 28th, 2015

Marc Masdeu Non-archimedean constructions September 28th, 2015 1 / 34

slide-3
SLIDE 3

Quaternionic automorphic forms of level N

F a number field of signature pr, sq, and fix N Ă OF . Choose factorization N “ Dn, with D square free. Fix embeddings v1, . . . , vr : F ã Ñ R, w1, . . . , ws : F ã Ñ C. Let B{F be a quaternion algebra such that RampBq “ tq: q | Du Y tvn`1, . . . , vru, pn ď rq. Fix isomorphisms B bFvi – M2pRq, i “ 1, . . . , n; B bFwj – M2pCq, j “ 1, . . . , s. These yield Bˆ{F ˆ ã Ñ PGL2pRqn ˆ PGL2pCqs ý Hn ˆ Hs

3.

R>0 C

H3

R>0

H

R

PGL2(R) PGL2(C) Marc Masdeu Non-archimedean constructions September 28th, 2015 2 / 34

slide-4
SLIDE 4

Quaternionic automorphic forms of level N (II)

Fix RD

0 pnq Ă B Eichler order of level n.

ΓD

0 pnq “ RD 0 pnqˆ{Oˆ F acts discretely on Hn ˆ Hs 3.

Obtain an orbifold of (real) dimension 2n ` 3s: Y D

0 pnq “ ΓD 0 pnqz pHn ˆ Hs 3q .

The cohomology of Y D

0 pnq can be computed via

H˚pY D

0 pnq, Cq – H˚pΓD 0 pnq, Cq.

Hecke algebra TD “ ZrTq : q ∤ Ds acts on H˚pΓD

0 pnq, Zq.

Hn`spΓD

0 pnq, Cq “

à

χ

Hn`spΓN

0 pnq, Cqχ,

χ: TD Ñ C. Each χ cuts out a field Kχ, s.t. rKχ : Qs “ dim Hn`spΓD

0 pnq, Cqχ.

Marc Masdeu Non-archimedean constructions September 28th, 2015 3 / 34

slide-5
SLIDE 5

Abelian varieties from cohomology classes

Definition

f P Hn`spΓD

0 pnq, Cqχ eigen for TD is rational if appfq P Z, @p P TD.

If r “ 0, then assume N is not square-full: Dp N.

Conjecture (Taylor, ICM 1994)

1

f P Hn`spΓD

0 pnq, Zq a new, rational eigenclass.

Then DEf{F of conductor N “ Dn attached to f. i.e. such that #EfpOF {pq “ 1 ` |p| ´ appfq @p ∤ N.

2

More generally, if χ: TD Ñ C is nontrivial, cutting out a field K, then D abelian variety Aχ, with dim Aχ “ rK : Fs and multiplication by K. Assumption above avoids “fake abelian varieties”, and it is needed in

  • ur construction anyway.

Marc Masdeu Non-archimedean constructions September 28th, 2015 4 / 34

slide-6
SLIDE 6

Goals of this talk

In this talk we will:

1

Review known explicit forms of this conjecture.

§ Cremona’s algorithm for F “ Q. § Generalizations to totally real fields. 2

Propose a new, non-archimedean, conjectural construction.

§ (joint work with X. Guitart and H. Sengun) 3

Explain some computational details.

4

Illustrate with examples.

Marc Masdeu Non-archimedean constructions September 28th, 2015 5 / 34

slide-7
SLIDE 7

F “ Q: Cremona’s algorithm for elliptic curves

Eichler–Shimura construction

X0pNq

JacpX0pNqq

ş

H0pX0pNq,Ω1q

_

H1pX0pNq,Zq Hecke

C{Λf – EfpCq.

1

Compute H1pX0pNq, Zq (modular symbols).

2

Find the period lattice Λf by explicitly integrating Λf “ Cż

γ

2πi ÿ

ně1

anpfqe2πinz : γ P H1 ´ X0pNq, Z ¯G .

3

Compute c4pΛfq, c6pΛfq P C by evaluating Eistenstein series.

4

Recognize c4pΛfq, c6pΛfq as integers ❀ Ef : Y 2 “ X3 ´ c4

48X ´ c6 864.

Marc Masdeu Non-archimedean constructions September 28th, 2015 6 / 34

slide-8
SLIDE 8

F ‰ Q: constructions for elliptic curves

F totally real. rF : Qs “ n, fix σ: F ã Ñ R. S2pΓ0pNqq Q f ❀ ˜ ωf P HnpΓ0pNq, Cq ❀ Λf Ď C.

Conjecture (Oda, Darmon, Gartner)

C{Λf is isogenous to Ef ˆF Fσ. Known to hold (when F real quadratic) for base-change of E{Q. Exploited in very restricted cases (Demb´ el´ e, Stein+7). Explicitly computing Λf is hard.

§ No quaternionic computations (except for Voight–Willis?).

F not totally real: no known algorithms. . .

Theorem

If F is imaginary quadratic, the lattice Λf is contained in R.

Idea

Allow for non-archimedean constructions.

Marc Masdeu Non-archimedean constructions September 28th, 2015 7 / 34

slide-9
SLIDE 9

Non-archimedean construction

From now on: fix p N. Denote by ¯ Fp “ alg. closure of the p-completion of F.

Theorem (Tate uniformization)

There exists a rigid-analytic, Galois-equivariant isomorphism η: ¯ F ˆ

p {xqEy Ñ Ep ¯

Fpq, with qE P F ˆ

p satisfying jpEq “ q´1 E ` 744 ` 196884qE ` ¨ ¨ ¨ .

Choose a coprime factorization N “ pDm, with D “ discpB{Fq. Compute qE as a replacement for Λf. Starting data: f P Hn`spΓD

0 pmq, Zqp´new,

pDm “ N.

Marc Masdeu Non-archimedean constructions September 28th, 2015 8 / 34

slide-10
SLIDE 10

Non-archimedean path integrals on Hp

Consider Hp “ P1pCpq P1pFpq. It is a p-adic analogue to H:

§ It has a rigid-analytic structure. § Action of PGL2pFpq by fractional linear transformations. § Rigid-analytic 1-forms ω P Ω1

Hp.

§ Coleman integration ❀ make sense of

şτ2

τ1 ω P Cp.

Get a PGL2pFpq-equivariant pairing ş : Ω1

Hp ˆ Div0 Hp Ñ Cp.

For each Γ Ă PGL2pFpq, get induced pairing (cap product) HipΓ, Ω1

Hpq ˆ HipΓ, Div0 Hpq ş

Cp

´ φ, ř

γ γ bDγ

¯ ✤

ř

γ

ż

φpγq. Ω1

Hp – space of Cp-valued boundary measures Meas0pP1pFpq, Cpq.

Marc Masdeu Non-archimedean constructions September 28th, 2015 9 / 34

slide-11
SLIDE 11

Measures and integrals

Bruhat-Tits tree of GL2pFpq, |p| “ 2. P1pFpq – EndspT q. Harmonic cocycles HCpAq “ tEpT q

f

Ñ A | ř

  • peq“v fpeq “ 0u

Meas0pP1pFpq, Aq – HCpAq. So replace ω P Ω1

Hp with

µω P Meas0pP1pFpq, Zq – HCpZq.

P1(Fp)

U ⊂ P1(Fp)

µ(U)

v∗ ˆ v∗ e∗

T

Coleman integration: if τ1, τ2 P Hp, then ż τ2

τ1

ω “ ż

P1pFpq

logp ˆt ´ τ2 t ´ τ1 ˙ dµωptq “ lim Ý Ñ

U

ÿ

UPU

logp ˆtU ´ τ2 tU ´ τ1 ˙ µωpUq. Multiplicative refinement (assume µωpUq P Z, @U): ˆ ż τ2

τ1

ω “ ˆ ż

P1pFpq

ˆt ´ τ2 t ´ τ1 ˙ dµωptq “ lim Ý Ñ

U

ź

UPU

ˆtU ´ τ2 tU ´ τ1 ˙µωpUq .

Marc Masdeu Non-archimedean constructions September 28th, 2015 10 / 34

slide-12
SLIDE 12

The tpu-arithmetic group Γ

Choose a factorization N “ pDm. B{F “ quaternion algebra with RampBq “ tq | Du Y tvn`1, . . . , vru. Recall also RD

0 ppmq Ă RD 0 pmq Ă B.

Fix ιp : RD

0 pmq ã

Ñ M2pZpq. Define ΓD

0 ppmq “ RD 0 ppmqˆ{Oˆ F and ΓD 0 pmq “ RD 0 pmqˆ{Oˆ F .

Let Γ “ RD

0 pmqr1{psˆ{OF r1{psˆ ιp

ã Ñ PGL2pFpq.

Example

F “ Q and D “ 1, so N “ pM. B “ M2pQq. Γ0ppMq “ ` a b

c d

˘ P GL2pZq: pM | c ( {t˘1u. Γ “ ` a b

c d

˘ P GL2pZr1{psq: M | c ( {t˘1u ã Ñ PGL2pQq Ă PGL2pQpq.

Marc Masdeu Non-archimedean constructions September 28th, 2015 11 / 34

slide-13
SLIDE 13

The tpu-arithmetic group Γ

Lemma

Assume that h`

F “ 1. Then ιp induces bijections

Γ{ΓD

0 pmq – V0pT q,

Γ{ΓD

0 ppmq – E0pT q

V0 “ V0pT q (resp. E0 “ E0pT q) are the even vertices (resp. edges) of T .

Proof.

1

Strong approximation ù ñ Γ acts transitively on E0 and V0.

2

Stabilizer of vertex v˚ (resp. edge e˚) is ΓD

0 pmq (resp. ΓD 0 ppmq).

Corollary

MapspE0pT q, Zq – IndΓ

ΓD

0 ppmq Z,

MapspVpT q, Zq – ´ IndΓ

ΓD

0 pmq Z

¯2 .

Marc Masdeu Non-archimedean constructions September 28th, 2015 12 / 34

slide-14
SLIDE 14

Cohomology

Γ “ RD

0 pmqr1{psˆ{OF r1{psˆ ιp

ã Ñ PGL2pFpq. MapspE0pT q, Zq – IndΓ

ΓD

0 ppmq Z,

MapspVpT q, Zq – ´ IndΓ

ΓD

0 pmq Z

¯2 . Want to define a cohomology class in Hn`spΓ, Ω1

Hpq.

Consider the Γ-equivariant exact sequence

HCpZq MapspE0pT q, Zq

β

MapspVpT q, Zq

ϕ ✤

rv ÞÑ ř

  • peq“v ϕpeqs

So get: 0 Ñ HCpZq Ñ IndΓ

ΓD

0 ppmq Z

β

Ñ ´ IndΓ

ΓD

0 pmq Z

¯2 Ñ 0

Marc Masdeu Non-archimedean constructions September 28th, 2015 13 / 34

slide-15
SLIDE 15

Cohomology (II)

0 Ñ HCpZq Ñ IndΓ

ΓD

0 ppmq Z

β

Ñ ´ IndΓ

ΓD

0 pmq Z

¯2 Ñ 0 Taking Γ-cohomology, . . . Hn`spΓ, HCpZqq Ñ Hn`spΓ, IndΓ

ΓD

0 ppmq, Zq

β

Ñ Hn`spΓ, IndΓ

ΓD

0 pmq, Zq2 Ñ ¨ ¨ ¨

. . . and using Shapiro’s lemma: Hn`spΓ, HCpZqq Ñ Hn`spΓD

0 ppmq, Zq β

Ñ Hn`spΓD

0 pmq, Zq2 Ñ ¨ ¨ ¨

f P Hn`spΓD

0 ppmq, Zq being p-new ô f P Kerpβq.

Pulling back get ωf P Hn`spΓ, HCpZqq – Hn`spΓ, Ω1

Hpq.

Marc Masdeu Non-archimedean constructions September 28th, 2015 14 / 34

slide-16
SLIDE 16

Holomogy

Consider the Γ-equivariant short exact sequence: 0 Ñ Div0 Hp Ñ Div Hp

deg

Ñ Z Ñ 0. Taking Γ-homology yields Hn`s`1pΓ, Zq

δ

Ñ Hn`spΓ, Div0 Hpq Ñ Hn`spΓ, Div Hpq Ñ Hn`spΓ, Zq Λf “ # ˆ ż

δpcq

ωf : c P Hn`s`1pΓ, Zq + Ă Cˆ

p

Conjecture A (Greenberg, Guitart–M.–Sengun)

The multiplicative lattice Λf is homothetic to qZ

E.

F “ Q: Darmon, Dasgupta–Greenberg, Longo–Rotger–Vigni. F totally real, |p| “ 1, B “ M2pFq: Spiess. Open in general.

Marc Masdeu Non-archimedean constructions September 28th, 2015 15 / 34

slide-17
SLIDE 17

Lattice: explicit construction

Start with f P Hn`spΓD

0 ppm, Zqqp´new.

Duality yields ˆ f P Hn`spΓD

0 ppmq, Zqqp´new.

Mayer–Vietoris exact sequence for Γ “ ΓD

0 pmq ‹ΓD

0 ppmq {

ΓD

0 pmq:

¨ ¨ ¨ Ñ Hn`s`1pΓ, Zq δ1 Ñ Hn`spΓD

0 ppmq, Zq β

Ñ Hn`spΓD

0 pmq, Zq2 Ñ ¨ ¨ ¨

ˆ f new at p ù ñ βp ˆ fq “ 0.

§ ˆ

f “ δ1pcfq, for some cf P Hn`s`1pΓ, Zq.

Conjecture (rephrased)

The element Lf “ ż

δpcfq

ωf. satisfies (up to a rational multiple) logppqEq “ Lf.

Marc Masdeu Non-archimedean constructions September 28th, 2015 16 / 34

slide-18
SLIDE 18

Algorithms

Only in the cases n ` s ď 1.

§ Both H1 and H1: fox calculus (linear algebra for finitely-presented

groups).

Use explicit presentation + word problem for ΓD

0 ppmq and ΓD 0 pmq.

§ John Voight (s “ 0). § Aurel Page (s “ 1).

Need the Hecke action on H1pΓD

0 ppmq, Zq and H1pΓD 0 ppmq, Zq.

§ Shapiro’s lemma ù

ñ enough to work with ΓD

0 pmq.

Integration pairing uses the overconvergent method.

Marc Masdeu Non-archimedean constructions September 28th, 2015 17 / 34

slide-19
SLIDE 19

Overconvergent Method

Starting data: cohomology class φ “ ωf P H1pΓ, Ω1

Hpq.

Goal: to compute integrals şτ2

τ1 φγ, for γ P Γ.

Recall that ż τ2

τ1

φγ “ ż

P1pFpq

logp ˆt ´ τ1 t ´ τ2 ˙ dµγptq. Expand the integrand into power series and change variables.

§ We are reduced to calculating the moments:

ż

Zp

tidµγptq for all γ P Γ.

Note: Γ Ě ΓD

0 pmq Ě ΓD 0 ppmq.

Technical lemma: All these integrals can be recovered from #ż

Zp

tidµγptq: γ P ΓD

0 ppmq

+ .

Marc Masdeu Non-archimedean constructions September 28th, 2015 18 / 34

slide-20
SLIDE 20

Overconvergent Method (II)

D “ tlocally analytic Zp-valued distributions on Zpu.

§ ϕ P D maps a locally-analytic function h on Zp to ϕphq P Zp. § D is naturally a ΓD

0 ppmq-module.

The map ϕ ÞÑ ϕp1Zpq induces a projection: H1pΓD

0 ppmq, Dq ρ

H1pΓD

0 ppmq, Zpq.

P Φ ✤

  • P

φ

Theorem (Pollack-Stevens, Pollack-Pollack)

There exists a unique Up-eigenclass Φ lifting φ. Moreover, Φ is explicitly computable by iterating the Up-operator.

Marc Masdeu Non-archimedean constructions September 28th, 2015 19 / 34

slide-21
SLIDE 21

Overconvergent Method (III)

But we wanted to compute the moments of a system of measures. . .

Proposition

Consider the map ΓD

0 ppmq Ñ D:

γ ÞÑ ” hptq ÞÑ ż

Zp

hptqdµγptq ı .

1

It satisfies a cocycle relation ù ñ induces a class Ψ P H1´ ΓD

0 ppmq, D

¯ .

2

Ψ is a lift of φ.

3

Ψ is a Up-eigenclass.

Corollary

The explicitly computed Φ “ Ψ knows the above integrals.

Marc Masdeu Non-archimedean constructions September 28th, 2015 20 / 34

slide-22
SLIDE 22

Recovering E from Λf

Λf “ xqfy gives us qf

?

“ qE. Assume ordppqfq ą 0 (otherwise, replace qf ÞÑ 1{qf). Get jpqfq “ q´1

f

` 744 ` 196884qf ` ¨ ¨ ¨ P Cˆ

p .

From N guess the discriminant ∆E.

§ Only finitely-many possibilities, ∆E P SpF, 12q.

jpqfq “ c3

4{∆E ❀ recover c4.

Recognize c4 algebraically. 1728∆E “ c3

4 ´ c2 6 ❀ recover c6.

Compute the conductor of Ef : Y 2 “ X3 ´ c4

48X ´ c6 864.

§ If conductor is correct, check aq’s. Marc Masdeu Non-archimedean constructions September 28th, 2015 21 / 34

slide-23
SLIDE 23

Example curve (joint with X. Guitart and H. Sengun)

F “ Qpαq, pαpxq “ x4 ´ x3 ` 3x ´ 1, ∆F “ ´1732. N “ pα ´ 2q “ p13. B{F ramified only at all infinite real places of F. There is a rational eigenclass f P S2pΓ0p1, Nqq. From f we compute ωf P H1pΓ, HCpZqq and Λf. qf

?

“ qE “ 8 ¨ 13 ` 11 ¨ 132 ` 5 ¨ 133 ` 3 ¨ 134 ` ¨ ¨ ¨ ` Op13100q. jE “ 1

13

´ ´ 4656377430074α3 ` 10862248656760α2 ´ 14109269950515α ` 4120837170980 ¯ .

c4 “ 2698473α3 ` 4422064α2 ` 583165α ´ 825127. c6 “ 20442856268α3 ´ 4537434352α2 ´ 31471481744α ` 10479346607. E{F : y2 ` ` α3 ` α ` 3 ˘ xy “ x3` ` ` ´2α3 ` α2 ´ α ´ 5 ˘ x2 ` ` ´56218α3 ´ 92126α2 ´ 12149α ` 17192 ˘ x ´ 23593411α3 ` 5300811α2 ` 36382184α ´ 12122562.

Marc Masdeu Non-archimedean constructions September 28th, 2015 22 / 34

slide-24
SLIDE 24

Tables: Imaginary quadratic fields

|∆K| fKpxq NmpNq pDm c4pEq, c6pEq 3 r1, ´1s 196 p3r ´ 2q7p´6r ` 2q28p1q ´131065r, 47449331 3 r1, ´1s 196 p´3r ` 1q7p6r ´ 4q28p1q ´131065r, 47449331 4 r1, 0s 130 p3r ´ 2q13p´r ´ 3q10p1q ´264r ` 257, ´6580r ` 2583 4 r1, 0s 130 p´3r ´ 2q13p´3r ´ 1q10p1q 264r ` 257, 6580r ` 2583 7 r2, ´1s 44 prq2p3r ` 1q22p1q 648r ` 481, ´28836r ` 4447 7 r2, ´1s 44 pr ´ 1q2p3r ´ 4q22p1q ´648r ` 1129, 28836r ´ 24389 8 r2, 0s 99 pr ` 1q3p´4r ` 1q33p1q 444r ` 25, 14794r ´ 16263 8 r2, 0s 99 pr ´ 1q3p´4r ´ 1q33p1q ´444r ` 25, ´14794r ´ 16263 8 r2, 0s 99 p´r ´ 3q11p3q9p1q ´444r ` 25, ´14794r ´ 16263 8 r2, 0s 99 pr ´ 3q11p3q9p1q 444r ` 25, 14794r ´ 16263 Marc Masdeu Non-archimedean constructions September 28th, 2015 23 / 34

slide-25
SLIDE 25

Tables: cubic p1, 1q fields

|∆K | fK pxq NmpNq pDm c4pEq, c6pEq 23 r1, 0, ´1s 185 pr2 ` 1q5p3r2 ´ r ` 1q37p1q 643318r2 ´ 1128871r ` 852306, 925824936r2 ´ 1624710823r ` 1226456111 31 r´1, 1, 0s 129 p´r ´ 1q3p´3r2 ´ 2r ´ 1q43p1q ´4787r2 ` 10585r ` 3349, 1268769r2 ´ 371369r ` 424764 44 r1, 1, ´1s 121 p2r ´ 1q11pr2 ` 2q11p1q 4097022r2 ´ 6265306r ` 7487000, 14168359144r2 ´ 21861492432r ` 26039140708 44 r1, 1, ´1s 121 p2r ´ 1q11pr2 ` 2q11p1q 1774r2 ´ 1434r ´ 1304, ´42728r2 ´ 123104r ´ 54300 44 r1, 1, ´1s 121 p2r ´ 1q11pr2 ` 2q11p1q 4097022r2 ´ 6265306r ` 7487000, 14168359144r2 ´ 21861492432r ` 26039140708 59 r´1, 2, 0s 34 p´r2 ´ 1q2p´r2 ´ 2r ´ 2q17p1q 262r2 ` 513r ` 264, ´2592r2 ` 448r ` 13231 59 r´1, 2, 0s 34 p´r2 ´ 2r ´ 2q17p´r2 ´ 1q2p1q 16393r2 ` 20228r ´ 12524, 4430388r2 ´ 5579252r ` 1619039 59 r´1, 2, 0s 46 p´2r2 ` r ´ 2q23p´r2 ´ 1q2p1q 18969r2 ` 8532r ` 41788, 4216716r2 ` 1911600r ` 9298151 59 r´1, 2, 0s 74 p´r2 ´ 1q2p2r2 ` 2r ` 1q37p1q 33054r2 ` 15049r ` 72776, 9702640r2 ` 4400116r ` 21401723 59 r´1, 2, 0s 88 p´r2 ´ 1q2pr ´ 2q11pr2 ` r ` 1q4 16609r2 ` 7084r ` 37332, 3522136r2 ` 1613876r ` 7760395 59 r´1, 2, 0s 187 p2r2 ` r ` 2q17pr ´ 2q11p1q ´32r2 ´ 848r ` 432, ´7600r2 ` 23368r ´ 8704 76 r´2, ´2, 0s 117 p2r2 ´ r ´ 3q13p´r2 ` 2r ` 1q9p1q 48r ` 16, ´128r2 ´ 224r ´ 216 83 r´2, 1, ´1s 65 pr ` 1q5p´2r ` 1q13p1q 3089r2 ` 1086r ` 4561, 333604r2 ` 117840r ` 493059 83 r´2, 1, ´1s 65 pr ` 1q5p´2r ` 1q13p1q 304r2 ` 112r ` 449, 6616r2 ` 2328r ` 9791 83 r´2, 1, ´1s 65 p´2r ` 1q13pr ` 1q5p1q 3089r2 ` 1086r ` 4561, 333604r2 ` 117840r ` 493059 83 r´2, 1, ´1s 65 p´2r ` 1q13pr ` 1q5p1q 4499473r2 ` 1589254r ` 6650137, 18573712184r2 `6560420272r `27451337687 83 r´2, 1, ´1s 106 prq2p2r2 ´ 3r ` 3q53p1q 2329r2 ` 822r ` 3441, ´34264r2 ´ 12104r ´ 50645 87 r1, 2, ´1s 123 pr2 ´ r ` 1q3pr2 ` 4q41p1q 1424r2 ` 3792r ` 2384, ´245696r2 ´ 201800r ´ 4144 87 r1, 2, ´1s 129 pr2 ´ r ` 1q3p´3r ` 1q43p1q ´752r2 ` 2272r ` 1009, 27496r2 ´ 152144r ´ 63977 87 r1, 2, ´1s 129 pr2 ´ r ` 1q3p´3r ` 1q43p1q ´752r2 ` 2272r ` 1009, 27496r2 ´ 152144r ´ 63977 104 r´2, ´1, 0s 143 pr2 ` r ´ 1q11p2r ` 1q13p1q 12r2 ` 12r ` 25, ´144r2 ´ 90r ´ 125 107 r´2, 3, ´1s 40 p´r2 ´ 1q5pr2 ´ r ` 3q4prq2 3880r2 ´ 984r ` 10473, 405820r2 ´ 105348r ` 1142075 107 r´2, 3, ´1s 135 p´r2 ´ 1q5p3q27p1q 16r2 ´ 16r, 184r ´ 296 108 r´2, 0, 0s 34 p2r ` 1q17prq2p1q 184r2 ` 212r ` 265, ´5010r2 ´ 6306r ´ 7773 108 r´2, 0, 0s 85 p´r2 ´ 1q5p2r ` 1q17p1q 2224r2 ` 2816r ` 3520, ´229056r2 ´ 288672r ´ 363768 108 r´2, 0, 0s 85 p2r ` 1q17p´r2 ´ 1q5p1q 2224r2 ` 2816r ` 3520, ´229056r2 ´ 288672r ´ 363768 108 r´2, 0, 0s 125 p´r2 ´ 1q5pr2 ´ 2r ´ 1q25p1q 496r2, 22088 108 r´2, 0, 0s 145 p´r2 ´ 1q5pr ` 3q29p1q 144r2 ` 176r ` 240, 3816r2 ` 4752r ` 6088 108 r´2, 0, 0s 155 p´r2 ´ 1q5pr2 ` 3q31p1q 16r2 ` 20r ` 17, ´606r2 ´ 762r ´ 929 116 r´2, 0, ´1s 34 p´2r ` 1q17p´r ` 1q2p1q 846760r2 ` 589024r ` 998761, 1781332252r2 ` 1239131712r ` 2101097467 116 r´2, 0, ´1s 34 p´r ` 1q2p´2r ` 1q17p1q 4592r2 ` 3192r ` 5417, 274400r2 ` 190876r ` 323659 116 r´2, 0, ´1s 38 p´r ` 1q2p2r ` 1q19p1q 82921r2 ` 57626r ` 97746, 54599355r2 ` 37980374r ` 64400978 116 r´2, 0, ´1s 38 p2r ` 1q19p´r ` 1q2p1q 1081r2 ` 746r ` 1266, 66555r2 ` 46310r ` 78482 116 r´2, 0, ´1s 58 p´r ` 1q2pr2 ` r ´ 3q29p1q 22024r2 ` 15320r ` 25977, ´4956678r2 ´ 3447968r ´ 5846447 135 r´1, 3, 0s 55 pr2 ´ r ` 2q11pr2 ` 1q5p1q 4139r2 ´ 19599r ` 5885, 2077971r2 ´ 1764501r ` 352796 135 r´1, 3, 0s 88 pr2 ´ r ` 2q11p2q8p1q ´1751r2 ´ 1226r ` 577, ´131901r2 ´ 120528r ` 52524 139 r2, 1, ´1s 46 pr ´ 3q23p´rq2p1q 22560r2 ` 19560r ` 1033, ´8413992r2 ` 2336724r ` 7421723 139 r2, 1, ´1s 57 pr ´ 1q3p´2r ` 1q19p1q 18r2 ` 61r ` 39, 296r ` 239 139 r2, 1, ´1s 57 p´2r ` 1q19pr ´ 1q3p1q 258r2 ` 541r ` 279, ´17136r2 ´ 9280r ` 3767 140 r´2, 2, 0s 25 pr2 ` 1q5pr ` 1q5p1q 1488r2 ` 992r ` 3968, 110440r2 ` 88352r ` 287144 140 r´2, 2, 0s 70 pr2 ` r ` 1q7pr ` 1q5prq2 139012r2 ` 106502r ` 360441, ´100613641r2 ´ 77548384r ´ 260995189 140 r´2, 2, 0s 95 pr2 ` 1q5pr2 ` 2r ` 3q19p1q 16r2 ` 16r, ´64r2 ` 240r ´ 120 140 r´2, 2, 0s 95 pr2 ` 1q5pr2 ` 2r ` 3q19p1q 64r2 ´ 64r ` 48, ´824r2 ´ 368r ` 616 172 r3, ´1, ´1s 45 pr ´ 2q5pr2 ´ r ´ 1q9p1q ´1072r2 ´ 80r ` 1872, ´49976r2 ´ 48864r ` 25920 175 r´3, 2, ´1s 27 prq3pr2 ´ r ` 2q9p1q ´384r2 ` 816r ´ 416, 5904r2 ´ 32472r ` 31816 199 r´1, 4, ´1s 21 p´r2 ` r ´ 2q7pr2 ´ r ` 3q3p1q 98529r2 ` 22348r ´ 12672, ´41881233r2 ` 130193546r ´ 31313977 199 r´1, 4, ´1s 21 p´r2 ` r ´ 2q7pr2 ´ r ` 3q3p1q ´112647r2 ´ 62978r ` 24321, ´60304454r2 ´ 96556295r ` 29529884 199 r´1, 4, ´1s 33 pr ´ 2q11pr2 ´ r ` 3q3p1q 2802r2 ` 3055r ´ 996, ´398780r2 ` 635911r ´ 139543 199 r´1, 4, ´1s 49 p´r2 ` r ´ 2q7p´r2 ´ 3q7p1q 6447r2 ´ 31223r ` 7758, 3699375r2 ´ 3171676r ` 577928 199 r´1, 4, ´1s 49 p´r2 ´ 3q7p´r2 ` r ´ 2q7p1q 6447r2 ´ 31223r ` 7758, 3699375r2 ´ 3171676r ` 577928 199 r´1, 4, ´1s 77 pr ` 1q7pr ´ 2q11p1q 12952r2 ´ 10791r ` 49899, 2866751r2 ´ 2163173r ` 10872899 199 r´1, 4, ´1s 99 pr ´ 2q11pr2 ` 1q9p1q ´120r2 ` 576r ´ 143, 380r2 ` 4776r ´ 1281 200 r2, 2, ´1s 14 pr ` 1q2pr2 ´ r ` 1q7p1q ´401r2 ´ 3756r ´ 2274, 182521r2 ´ 243668r ´ 235802 200 r2, 2, ´1s 14 pr2 ´ r ` 1q7pr ` 1q2p1q ´241r2 ` 404r ` 366, 5649r2 ` 3068r ´ 394 200 r2, 2, ´1s 65 p´r2 ´ r ´ 1q13p´r2 ` r ´ 3q5p1q ´1176r2 ´ 1944r ´ 767, 75636r2 ´ 142236r ´ 124561 204 r´3, 1, ´1s 21 pr2 ` r ` 1q7prq3p1q ´48r2 ` 96r ´ 32, ´288r2 ` 1008r ´ 872 204 r´3, 1, ´1s 21 pr2 ` r ` 1q7prq3p1q 262r2 ´ 326r ´ 44, ´1784r2 ´ 5128r ` 11612 211 r´3, ´2, 0s 21 pr ` 2q7p´rq3p1q 22010896r2 ` 41672992r ` 34877233, 296072400488r2 ` 560550677168r ` 469139740087 212 r´2, 4, ´1s 35 pr2 ´ r ` 1q7pr2 ´ r ` 3q5p1q 29888r2 ´ 13952r ` 112113, 10054302r2 ´ 4693580r ` 37714701 216 r´2, 3, 0s 34 prq2pr2 ` r ` 5q17p1q 307r2 ` 194r ` 1057, ´11235r2 ´ 6786r ´ 37821 216 r´2, 3, 0s 34 pr2 ` r ` 5q17prq2p1q 307r2 ` 194r ` 1057, ´11235r2 ´ 6786r ´ 37821 |∆K | fK pxq NmpNq pDm c4pEq, c6pEq 216 r´2, 3, 0s 38 p´2r2 ´ 2r ´ 7q19prq2p1q 16r2 ` 81, ´216r2 ´ 192r ´ 601 231 r3, 0, ´1s 33 p´r ` 1q3pr2 ´ r ` 2q11p1q 465r2 ´ 1011r ` 1189, 25273r2 ´ 54957r ` 64546 231 r3, 0, ´1s 33 pr2 ´ r ` 2q11p´r ` 1q3p1q 465r2 ´ 1011r ` 1189, 25273r2 ´ 54957r ` 64546 231 r3, 0, ´1s 51 pr2 ` 1q17prq3p1q ´47r2 ´ 50r ` 145, 938r2 ´ 291r ` 4 239 r´3, ´1, 0s 24 pr ` 1q3p2q8p1q 9r2 ` 18r ` 25, 143r2 ` 236r ` 268 239 r´3, ´1, 0s 57 p´r2 ´ r ` 1q19pr ` 1q3p1q 1170r2 ` 1953r ` 2098, 108233r2 ` 180929r ` 194227 243 r´3, 0, 0s 10 pr ´ 2q5pr ´ 1q2p1q 27576r2 ` 39771r ` 57360, 11428272r2 ` 16482420r ` 23771763 243 r´3, 0, 0s 10 pr ´ 1q2pr ´ 2q5p1q 27576r2 ` 39771r ` 57360, 11428272r2 ` 16482420r ` 23771763 243 r´3, 0, 0s 22 pr ` 2q11pr ´ 1q2p1q 2002130917752r2 ` 2887572455827r ` 4164600133648, 7076846143946804016r2 ` 10206578310238918020r ` 14720433182250993839 243 r´3, 0, 0s 34 pr2 ` 2q17pr ´ 1q2p1q 10167352r2 ` 14663859r ` 21148944, ´80986535280r2 ´ 116802795708r ´ 168458781921 243 r´3, 0, 0s 46 p´2r ` 1q23pr ´ 1q2p1q 19946163r2 ` 28767345r ` 41489691, 222892996797r2 ` 321467328855r ` 463636116909 255 r´3, 0, ´1s 15 p´r2 ´ 1q5pr ´ 1q3p1q 248r2 ´ 320r ´ 263, ´2556r2 ´ 4104r ` 16523 255 r´3, 0, ´1s 15 p´r2 ´ 1q5prq3p1q 19r2 ´ r ` 88, 279r2 ` 908 255 r´3, 0, ´1s 51 pr2 ´ 2q17pr ´ 1q3p1q ´32r2 ` 240r ´ 336, ´3416r2 ` 2400r ` 7392 255 r´3, 0, ´1s 51 pr2 ´ 2q17pr ´ 1q3p1q 80r2 ´ 80r ´ 128, 288r2 ´ 2088r ` 2888 255 r´3, 0, ´1s 65 pr2 ´ r ` 1q13pr ` 1q5p1q 3r2 ´ 105r ` 88, ´909r2 ` 1116r ´ 1576 268 r5, ´3, ´1s 14 pr2 ´ 2q7pr ´ 1q2p1q ´285113701784r2 ´ 52062773310r ` 950706811227, 144006413291532359r2 ` 50857254178772568r ´ 433038348784793416 300 r´3, ´3, ´1s 9 p´r2 ` 2r ` 2q3prq3p1q 26r2 ` 46r ` 4, 504r2 ` 504r ` 460 300 r´3, ´3, ´1s 9 p´r2 ` 2r ` 2q3prq3p1q 26r2 ` 46r ` 4, 504r2 ` 504r ` 460 300 r´3, ´3, ´1s 33 pr2 ´ r ´ 1q11prq3p1q 11072r2 ` 17760r ` 12865, 4675808r2 ` 7475664r ` 5398495 300 r´3, ´3, ´1s 90 p´r2 ` 2r ` 2q3p´r ´ 3q30p1q ´71, ´1837 307 r2, 3, ´1s 10 pr ´ 1q5p´rq2p1q ´1450479r2 ´ 118958r ` 338681, ´1778021804r2 ´ 7601175244r ´ 3506038549 307 r2, 3, ´1s 45 pr ´ 1q5pr2 ´ 2r ` 5q9p1q r2 ` 154r ` 81, ´1744r2 ´ 1756r ´ 441 324 r´4, ´3, 0s 4 pr ´ 2q2p´r ´ 1q2p1q 345255874728r2 ` 758120909880r ` 628931968401, 686899433218582980r2 ` 1508309811434747772r ` 1251283596457392135 324 r´4, ´3, 0s 22 pr2 ´ r ´ 1q11pr ´ 2q2p1q 808464801r2 ` 1775245884r ` 1472731953, 77832295537635r2 ` 170905971571164r ` 141782435639127 324 r´4, ´3, 0s 84 pr2 ` 3r ` 3q7p´r2 ´ 3r ´ 2q12p1q 143742984r2 ` 315634200r ` 261847993, 4700399015844r2 ` 10321245891900r ` 8562435635987 327 r´3, ´2, ´1s 9 prq3pr ` 1q3p1q 13r2 ` 22r ` 25, 144r2 ` 225r ` 242 327 r´3, ´2, ´1s 15 p´r ` 1q5prq3p1q 1645r2 ´ 2647r ´ 2984, 55543r2 ´ 6268r ´ 298328 327 r´3, ´2, ´1s 15 prq3p´r ` 1q5p1q 1645r2 ´ 2647r ´ 2984, 55543r2 ´ 6268r ´ 298328 335 r1, 4, ´1s 25 pr2 ´ r ` 3q5p´r ` 1q5p1q ´951r2 ` 1190r ` 57, 61922r2 ´ 78025r ´ 346 335 r1, 4, ´1s 25 pr2 ´ r ` 3q5p´r ` 1q5p1q 10r2 ´ 11r ` 10, 52r2 ´ 271r ´ 29 335 r1, 4, ´1s 65 p´r2 ` 2r ´ 4q13p´r ` 1q5p1q 61r2 ´ 77r ` 247, 101r2 ´ 107r ` 380 351 r´3, 3, 0s 33 pr ´ 2q11prq3p1q 16r2 ` 144r ´ 128, 1824r2 ´ 72r ´ 1160 356 r7, 1, ´1s 14 p´r ´ 2q7p 1

2 r2 ´ r ` 3 2 q2p1q 1577904r2 ` 58258032r ` 83210433, 157810225239r2 ` 783843846012r ` 817040026548 356 r7, 1, ´1s 26 p´r ` 2q13p´ 1 2 r2 ` r ´ 5 2 q2p1q ´353192r2 ´ 495936r ` 44233, ´560380445r2 ´ 897785708r ´ 94909392 356 r7, 1, ´1s 26 p´r ` 2q13p´ 1 2 r2 ` r ´ 5 2 q2p1q 88412r2 ` 1393648r ` 1878333, 112777386r2 ` 1758482408r ` 2367346473 356 r7, 1, ´1s 196 prq7pr ´ 3q28p1q 4182384r2 ´ 3886864r ´ 15048991, ´37671142504r2 ´ 30349104360r ` 38274580847 364 r´2, 4, 0s 21 pr ´ 1q3p´r ´ 1q7p1q ´368r2 ´ 3712r ` 1840, ´72736r2 ` 343360r ´ 146264 364 r´2, 4, 0s 26 p´r2 ´ 1q13p´rq2p1q ´266582r2 ` 148350r ´ 10479, ´274275343r2 ` 306719520r ´ 83736937 379 r´4, 1, ´1s 6 pr ´ 1q3p´r ` 2q2p1q 1418236432r2 ` 1053691808r ` 3254778265, 137488390576232r2 ` 102148264969648r ` 315528648990403 379 r´4, 1, ´1s 6 p´r ` 2q2pr ´ 1q3p1q 1418236432r2 ` 1053691808r ` 3254778265, 137488390576232r2 ` 102148264969648r ` 315528648990403 379 r´4, 1, ´1s 21 pr ´ 1q3pr ` 1q7p1q 15373338r2 ` 11421763r ` 35281005, ´155147444344r2 ´ 115268221468r ´ 356055251669 379 r´4, 1, ´1s 21 pr ` 1q7pr ´ 1q3p1q 15373338r2 ` 11421763r ` 35281005, ´155147444344r2 ´ 115268221468r ´ 356055251669 379 r´4, 1, ´1s 27 pr ´ 1q3pr2 ` 1q9p1q 1532208r2 ` 1138368r ` 3516337, 1280550616r2 ` 951396864r ` 2938796535 379 r´4, 1, ´1s 34 pr ´ 3q17p´r ` 2q2p1q 90342993r2 ` 67121158r ` 207332433, 2363568298948r2 ` 1756034817652r ` 5424265343699 439 r5, ´2, ´1s 15 p´r ` 1q3pr ´ 2q5p1q ´439r2 ` 1212r ´ 1252, 27743r2 ´ 76494r ` 78935 439 r5, ´2, ´1s 15 pr ´ 2q5p´r ` 1q3p1q ´439r2 ` 1212r ´ 1252, 27743r2 ´ 76494r ` 78935 440 r´8, 2, 0s 10 p´r2 ´ 2r ´ 5q5p´ 1 2 r2 ´ r ´ 2q2p1q ´349392832r2 ´ 1512227664r ` 3500497481, ´12893566003280r2 ´ 143880769408104r ` 276285496852283 440 r´8, 2, 0s 10 p´ 1 2 r2 ´ r ´ 2q2p´r2 ´ 2r ´ 5q5p1q ´349392832r2 ´ 1512227664r ` 3500497481, ´12893566003280r2 ´ 143880769408104r ` 276285496852283 440 r´8, 2, 0s 26 p2r ´ 3q13p´ 1 2 r2 ´ r ´ 2q2p1q 953 2 r2 ´ 6046r ` 8769, ´ 419561 2 r2 ` 835646r ´ 810505 451 r8, ´5, ´1s 26 p2r ´ 3q13p´r ` 2q2p1q 34296r2 ` 4776r ´ 189951, 5707476r2 ` 13155804r ´ 1647297 459 r´8, 3, 0s 22 p 1 2 r2 ´ 1 2 r ` 1q11p´ 1 2 r2 ´ 1 2 r ´ 2q2p1q 16r2 ´ 104r ` 121, ´240r2 ` 1260r ´ 1357 459 r´8, 3, 0s 33 p´ 1 2 r2 ´ 1 2 r ` 1q11p 1 2 r2 ` 1 2 r ` 3q3p1q ´ 19 2 r2 ` 15 2 r ` 21, ´36r2 ` 96r ´ 37 459 r´8, 3, 0s 33 pr2 ` r ` 5q11p 1 2 r2 ` 1 2 r ` 3q3p1q 178829 2 r2 ` 270521 2 r ` 472861, ´83966694r2 ´ 127020222r ´ 444049333 459 r´8, 3, 0s 34 p 1 2 r2 ` 3 2 r ´ 3q17p´ 1 2 r2 ´ 1 2 r ´ 2q2p1q 125 2 r2 ` 79 2 r ´ 59, 282r2 ´ 2430r ` 2691 459 r´8, 3, 0s 44 p 1 2 r2 ´ 1 2 r ` 1q11pr ´ 1q4p1q 31 2 r2 ´ 105 2 r ` 44, 411r2 ´ 1452r ` 1256 459 r´8, 3, 0s 44 p 1 2 r2 ´ 1 2 r ` 1q11pr ´ 1q4p1q 103 2 r2 ´ 55 2 r ´ 60, 237r2 ` 1374r ´ 2984 460 r´3, 5, ´1s 6 p´rq3pr ´ 1q2p1q 38808r2 ` 63978r ´ 55637, 28650959r2 ` 29220772r ´ 29738968 460 r´3, 5, ´1s 25 p2r2 ´ r ` 10q5p´r2 ´ 4q5p1q 36772r2 ´ 83396r ` 37921, 32322356r2 ´ 98725758r ` 49331449 460 r´3, 5, ´1s 26 pr2 ´ r ` 1q13pr ´ 1q2p1q 973808r2 ´ 7106166r ` 4086627, ´8777739333r2 ` 7426503436r ´ 1197128148 515 r´4, ´1, ´1s 14 p´r ` 2q2pr2 ´ 2r ´ 1q7p1q ´7341361r2 ´ 9117211r ´ 13098483, ´14436506787r2 ´ 17928648161r ´ 25757667905 519 r7, ´4, ´1s 39 p´r2 ` 3q13p´r ` 2q3p1q ´280r2 ´ 960r ´ 751, 54220r2 ` 11272r ´ 242353 547 r´4, ´3, ´1s 14 p´r ` 1q7pr2 ´ 2r ´ 2q2p1q 14509048r2 ` 24346088r ` 21671521, 200457117220r2 ` 336365736396r ` 299413898447 652 r5, 7, ´1s 14 p´ 1 2 r2 ` r ` 1 2 q7p´ 1 2 r2 ` r ´ 9 2 q2p1q 18r2 ´ 36r ` 147, 405r2 ´ 648r ` 3294 687 r3, 4, ´1s 9 prq3pr ` 1q3p1q ´7r2 ` 38r ` 25, ´18r2 ´ 423r ´ 244 743 r´3, 5, 0s 9 p´r ` 1q3prq3p1q 736r2 ` 416r ` 3913, ´110256r2 ´ 62192r ´ 586373 755 r2, 5, ´1s 10 p´2r2 ` 3r ´ 11q5p´rq2p1q ´1634r2 ` 10769r ` 4135, 110372r2 ` 1174880r ` 412903 815 r´9, ´7, 0s 9 pr ` 1q3p´r ` 3q3p1q 26678105835217r2 ` 83793885354406r ` 76443429630973, 717286463675094140331r2 ` 2252941797094015980448r ` 2055312234304678362824 1196 r´7, 5, ´1s 14 p´rq7p´r ` 1q2p1q ´12r2 ´ 4r ` 25, ´4r2 ´ 134r ` 181

Marc Masdeu Non-archimedean constructions September 28th, 2015 24 / 34

slide-26
SLIDE 26

Tables: quartic p2, 1q fields (I)

|∆K| fKpxq NmpNq pDm c4pEq, c6pEq 643 r1, ´2, 0, ´1s 175 pr3 ´ r2 ´ r ´ 1q7p2r3 ´ r2 ´ 2q25p1q ´1783r3 ` 1032r2 ` 522r ` 3831, 116369r3 ´ 62909r2 ´ 30125r ´ 248439 688 r´1, ´2, 0, 0s 11 p´r3 ` r2 ` r ` 2q11p1qp1q 200r3 ` 284r2 ` 376r ` 136, ´5184r3 ´ 7280r2 ´ 10024r ´ 3672 688 r´1, ´2, 0, 0s 19 p2r3 ´ 3q19p1qp1q 552r3 ` 764r2 ` 1064r ` 392, ´11536r3 ´ 16160r2 ´ 22584r ´ 8312 731 r´1, 0, 2, ´1s 80 pr2 ` 1q5p1qp2q16 ´848r3 ` 1529r2 ` 456r ´ 420, 45471r3 ´ 164824r2 ` 11648r ` 72230 775 r´1, ´3, 0, ´1s 176 p´r3 ` r2 ` 1q11p2q16p1q ´ 6277 2 r3 ´ 2939r2 ´ 5696r ´ 3239 2 , ´528578r3 ´ 495324r2 ´ 959488r ´ 272875 976 r´1, 0, 3, ´2s 44 pr ´ 2q11p1qpr3 ´ r2 ` r ` 2q4 ´42r3 ´ 21r2 ` 20r ` 10, ´10860r3 ´ 12344r2 ` 6618r ` 4899 976 r´1, 0, 3, ´2s 65 pr3 ´ 2r2 ` 4rq13p1qpr3 ´ 2r2 ` 3r ` 1q5 72r3 ` 20r2 ´ 40r ´ 4, ´1456r3 ` 3800r2 ´ 176r ´ 1200 1107 r´1, ´2, 0, ´1s 99 pr ´ 1q3p´2r ` 1q33p1q 105488r3 ` 90125r2 ` 152590r ` 66821, 120373437r3 ` 96189249r2 ` 171765105r ` 67816591 1156 r1, ´1, ´2, ´1s 19 pr3 ´ r2 ´ 2r ´ 3q19p1qp1q ´816481030r3 ´882631565r2 ´203810962r` 392346684, ´68032828897760r3 ´ 73544780430596r2 ´ 16982427384164r ` 32692074898043 1156 r1, ´1, ´2, ´1s 19 pr ` 2q19p1qp1q ´384131503r3 ´ 415253582r2 ´ 95887519r ` 184588047, 82379129020040r3 ` 89053403394404r2 ` 20563566138596r ´ 39585957243581 1192 r´1, 1, 2, ´1s 38 pr2 ` 2q19p1qpr3 ´ r2 ` 2rq2 9504r3 ` 11111r2 ´ 4762r ´ 5690, ´2387028r3 ` 7298060r2 ` 2454128r ´ 3005365 1255 r´1, ´3, ´1, 0s 170 pr3 ´ r ´ 2q2p´2r3 ` 2r2 ` 3q85p1q 517916r3 ` 904037r2 ` 1060116r ` 296716, ´1433064139r3 ´ 2501458160r2 ´ 2933309166r ´ 820990264 1423 r´1, ´2, 1, ´1s 98 pr ´ 1q2p2r3 ´ r2 ` 2r ´ 2q49p1q 39690531r3 ` 20246442r2 ` 70104884r ` 26465314, 702653466524r3 ` 356968363314r2 ` 1240909503739r ` 466012978440 1423 r´1, ´2, 1, ´1s 98 pr3 ´ r2 ` 2r ´ 1q7pr3 ´ 2r2 ` 2r ´ 1q14p1q 54577r3 ` 27699r2 ` 96525r ` 36260, 1735232r3 ` 881975r2 ` 3066920r ` 1151600 1588 r2, 0, ´3, ´1s 56 p´r3 ` r2 ` 3r ` 1q7pr3 ´ r2 ´ 3rq8p1q 94560r3 ` 111816r2 ´ 39672r ´ 86639, 747493992r3 ` 883740564r2 ´ 313920684r ´ 685060489 1588 r2, 0, ´3, ´1s 152 pr3 ´ 3r ´ 1q19pr3 ´ r2 ´ 3rq8p1q 3496200r3 ` 4469800r2 ´ 803168r ´ 2816543, 26973722420r3 ` 32247663708r2 ´ 10621228512r ´ 24308855297 1600 r´4, 0, ´2, 0s 11 p 1 2 r2 ´ r ´ 1q11p1qp1q 12r3 ` 48r2 ` 56r ` 20, ´284r3 ´ 460r2 ´ 472r ´ 1024 1600 r´4, 0, ´2, 0s 11 p 1 2 r2 ` r ´ 1q11p1qp1q 276r3 ` 490r2 ` 336r ` 628, ´18172r3 ´ 32652r2 ´ 22424r ´ 40464 1600 r´4, 0, ´2, 0s 19 p 1 2 r3 ´ 1 2 r2 ´ r ´ 1q19p1qp1q ´44r3 ` 112r2 ´ 56r ` 148, ´1660r3 ` 2572r2 ´ 2056r ` 3136 1600 r´4, 0, ´2, 0s 19 p´ 1 2 r3 ´ 1 2 r2 ` r ´ 1q19p1qp1q 44r3 ` 112r2 ` 56r ` 148, 1660r3 ` 2572r2 ` 2056r ` 3136 1732 r´1, 3, 0, ´1s 13 pr ´ 2q13p1qp1q 3455801r3 ` 1359008r2 ´ 3314187r ` 836393, 7590438778r3 ´ 14215787438r2 ´ 23508658710r ` 9402560739 1732 r´1, 3, 0, ´1s 182 pr3 ´ r ` 3q7pr2 ´ r ´ 2q26p1q ´17184648r3 ´ 14365296r2 ` 9302744r ´ 813151, 93038140030r3 ´ 219828160822r2 ´ 331159079722r ` 135298016971 1823 r´2, 3, 0, ´1s 114 p´r3 ` r ´ 3q3pr3 ` r2 ` 2q38p1q 233810r3 ´ 9696r2 ´ 336273r ` 159951, ´70457084r3 ´ 403468159r2 ´ 171041003r ` 342434077 1879 r1, ´3, ´2, ´1s 140 p 1 2 r3 ´ 2r ´ 1 2 q7pr3 ´ r2 ´ r ´ 2q20p1q ´2436r3 ´ 3240r2 ´ 2688r ` 1045, ´49029102r3 ´ 65262564r2 ´ 54075240r ` 21032621

Marc Masdeu Non-archimedean constructions September 28th, 2015 25 / 34

slide-27
SLIDE 27

Tables: quartic p2, 1q fields (II)

|∆K | fK pxq NmpNq pDm c4pEq, c6pEq 2051 r1, 3, ´1, ´1s 15 pr3 ´ r2 ` 2q5p1qp´r ` 1q3 ´489r3 ` 1228r2 ´ 1242r ` 18, 46792r3 ´ 100917r2 ` 73440r ` 47160 2068 r1, 3, ´2, ´1s 7 pr ´ 2q7p1qp1q 26909497r3 ` 20141314r2 ´ 35624307r ´ 11296953, 247303058576r3 ´ 3168333376r2 ´ 656295560992r ´ 182979737393 2068 r1, 3, ´2, ´1s 13 p´r3 ` r2 ` 2r ´ 1q13p1qp1q 34500648r3 ` 3814392r2 ´ 84122424r ´ 23737447, ´77408488074r3 ´ 354426093238r2 ´ 415474468618r ´ 92161502469 2068 r1, 3, ´2, ´1s 56 pr ´ 2q7pr3 ´ 2r ` 1q8p1q ´3576591826r3 ´ 1882130113r2 ` 6123537074r ` 1835712204, 321001991693952r3 ` 322520099276304r2 ´ 281263304453488r ´ 100176319060369 2068 r1, 3, ´2, ´1s 182 pr ´ 2q7p´r3 ` r2 ´ 2q26p1q ´1994707423r3 ´ 282234694r2 ` 4755878517r ` 1346474783, ´8733155599162r3 ´ 54136988565986r2 ´ 71594660083402r ´ 16347374680241 2092 r´2, ´3, 1, ´1s 8 prq2p1qpr ´ 1q4 ´3r3 ` 29r2 ´ r ` 75, 231r3 ´ 61r2 ` 497r ´ 287 2096 r2, ´2, ´2, 0s 28 pr3 ´ r ´ 1q7p1qpr3 ` r2 ´ 2q4 116r3 ´ 390r2 ` 402r ´ 94, 7354r3 ` 222r2 ´ 29620r ` 17640 2116 r´2, 0, 1, ´1s 5 pr2 ` 1q5p1qp1q 129712r3 ` 31248r2 ` 168480r ` 209073, ´109612390r3 ´ 26402860r2 ´ 142375012r ´ 176669575 2116 r´2, 0, 1, ´1s 130 pr2 ` 1q5pr ` 2q26p1q 105064r3 ` 25312r2 ` 136464r ` 169353, 78278092r3 ` 18855232r2 ` 101675032r ` 126166043 2116 r´2, 0, 1, ´1s 130 pr3 ´ r2 ` r ` 1q13pr3 ` rq10p1q 105064r3 ` 25312r2 ` 136464r ` 169353, 78278092r3 ` 18855232r2 ` 101675032r ` 126166043 2183 r´1, 1, 3, ´2s 126 p´r3 ` 2r2 ´ 4rq7pr3 ´ 2r2 ` 4r ` 1q18p1q ´330539r3 ´ 223654r2 ` 72664r ` 52816, 421344240r3 ` 649688112r2 ´ 51218957r ´ 170790474 2191 r´1, 0, 3, ´1s 70 p´r3 ´ 2r ´ 2q5p´2r3 ` r2 ´ 5r ´ 2q14p1q ´928r3 ` 6929r2 ´ 312r ´ 2120, ´885775r3 ` 1164640r2 ` 179150r ´ 336602 2191 r´1, 0, 3, ´1s 80 p´r3 ´ 2r ´ 2q5p2q16p1q ´408r3 ` 2689r2 ´ 105r ´ 821, 120899r3 ` 70135r2 ´ 44492r ´ 24989 2243 r´1, ´3, ´1, ´1s 75 pr ´ 1q5p´r3 ` 2r2 ´ r ` 2q15p1q 586900359r3 ` 694528587r2 ` 929522310r ` 268803085, 63399246832324r3 ` 75025661482408r2 ` 100410590521972r ` 29037147633615 2243 r´1, ´3, ´1, ´1s 75 pr3 ´ r2 ´ 2r ´ 2q5p´r3 ` r2 ` 2r ` 3q15p1q 586900359r3 ` 694528587r2 ` 929522310r ` 268803085, 63399246832324r3 ` 75025661482408r2 ` 100410590521972r ` 29037147633615 2243 r´1, ´3, ´1, ´1s 105 p´r3 ` 2r2 ` 2q7p´r3 ` 2r2 ´ r ` 2q15p1q 4336158r3 `5131353r2 `6867535r`1985981, ´22914354769r3 ´ 27116483373r2 ´ 36291344215r ´ 10494880213 2243 r´1, ´3, ´1, ´1s 105 pr ´ 1q5pr2 ´ r ` 1q21p1q 920025r3 ` 1088737r2 ` 1457115r ` 421377, 3942374598r3 ` 4665343442r2 ` 6243862193r ` 1805625754 2284 r´4, 2, 2, ´2s 22 p´r2 ` r ` 1q11p1qp 1 2 r3 ´ r2 ` 1q2 ´4322076r3 ` 3371584r2 ´ 4531104r ´ 14171719, ´293858698818r3 ` 229234508344r2 ´ 308070583688r ´ 963537590781 2327 r´2, ´1, ´1, 0s 48 pr2 ´ 1q3p2q16p1q 60947675662300r3 ` 95467421346487r2 ` 88590894936957r ` 77819621400035, 1595218950381053851625r3 ` 2498724287457442364789r2 ` 2318740987988175420378r ` 2036818157516553727423 2327 r´2, ´1, ´1, 0s 66 pr2 ´ 1q3p´r3 ` 2q22p1q 24654r3 ` 41044r2 ` 36631r ` 33971, 13602419r3 ` 21481224r2 ` 19830770r ` 17549287 2327 r´2, ´1, ´1, 0s 78 pr2 ´ 1q3pr3 ´ r2 ` rq26p1q 1632339r3 `2556895r2 `2372706r`2084241, 5442997756r3 ` 8525820467r2 ` 7911705090r ` 6949764691 2443 r´1, ´3, 0, 0s 63 pr3 ´ 2q3p´r ´ 2q21p1q 51601r3 ` 81980r2 ` 123695r ` 33695, ´38870055r3 ´ 59926714r2 ´ 92404714r ´ 25325630 2443 r´1, ´3, 0, 0s 117 p´r3 ` r2 ´ r ` 2q13p´r2 ` 1q9p1q ´26624r3 ´ 78583r2 ` 147974r ` 56321, 41156101r3 ´ 906363r2 ´ 80062921r ´ 24803969 2480 r´2, ´2, 0, 0s 17 p´r3 ` r2 ` r ` 1q17p1qp1q 8r3 ´ 12r2 ´ 12r ` 17, 212r3 ` 628r2 ´ 818r ´ 887 2480 r´2, ´2, 0, 0s 19 p´r2 ` r ´ 1q19p1qp1q ´648r3 ` 524r2 ´ 408r ` 1636, 29224r3 ´ 23272r2 ` 18616r ´ 73216 2608 r´2, ´2, ´2, 0s 50 p´r ` 1q5pr3 ´ r2 ´ rq10p1q ´18122952r3 ` 23309952r2 ` 6270652r ` 28184369, ´178706675384r3 ` 229835084602r2 ` 61821736238r ` 277904169213 2696 r1, ´3, 0, ´1s 24 pr3 ´ 2q3pr3 ´ 3q8p1q 25999152r3 ` 20125515r2 ` 35704342r ´ 14654974, ´282591287516r3 ´ 218749239468r2 ´ 388079405968r ` 159288610195 2816 r´1, ´4, ´2, 0s 15 pr2 ´ r ´ 1q5p1qpr3 ´ r2 ´ 2r ´ 1q3 134184108r3 ´ 165313100r2 ´ 203588440r ´ 41893502, 2470282983044r3 ´ 3964870336170r2 ´ 2128766125800r ´ 223343175430 2859 r´3, 3, ´1, ´1s 7 p´r3 ` r ´ 1q7p1qp1q ´4976r3 ` 12905r2 ´ 15523r ` 9529, 1469059r3 ´ 3794717r2 ` 4539759r ´ 2782843 3119 r´4, ´3, ´2, ´1s 23 p 2 3 r3 ´ r2 ´ 1 3 r ´ 1 3 q23p1qp1q 16743632r3 ` 25416768r2 ` 30512064r ` 26598352, ´406345115512r3 ´ 616830291616r2 ´ 740486023984r ´ 645505557528 3188 r2, ´4, 1, ´1s 24 p´r3 ` r2 ´ r ` 3q3p´r3 ` r2 ´ r ` 4q8p1q 2788172026368r3 ` 1423837175512r2 ` 4939120830288r ´ 3691304019543, ´10952993228320557238r3 ´ 5593370421245480720r2 ´ 19402732864546458324r ` 14500836945256233797 3216 r3, 0, ´1, ´2s 5 p´r ´ 1q5p1qp1q 16r3 ´ 40r2 ` 48r ´ 20, 104r3 ´ 376r2 ` 816r ´ 608 3271 r´1, ´1, 3, 0s 110 pr3 ` r2 ` 3r ` 2q5p´r3 ` r2 ´ 2r ` 2q22p1q 228r3 ´ 115r2 ` 220r ` 132, 6359r3 ´ 2608r2 ´ 6398r ´ 1760 3275 r´9, 6, 2, ´1s 19 p´ 1 9 r3 ´ 2 9 r2 ´ 8 9 r ´ 7 3 q19p1qp1q 23 3 r3 ´ 20 3 r2 ` 34 3 r ´ 14, 496 9 r3 ´ 1690 9 r2 ` 1979 9 r ´ 263 3 3275 r´9, 6, 2, ´1s 19 pr ´ 2q19p1qp1q 3r3 ` 30r2 ´ 27r ´ 10, 332 9 r3 ´ 632 9 r2 ´ 7136 9 r ` 2693 3 3284 r´2, 0, ´1, ´1s 6 pr ´ 1q3p1qprq2 2016r3 ` 1720r2 ` 1160r ` 2161, ´290488r3 ´ 248004r2 ´ 169132r ´ 313401 3407 r´3, 1, ´2, ´1s 84 p 1 2 r3 ´ 2r ` 1 2 q7pr2 ´ rq12p1q 28129013 2 r3 ` 15057426r2 ` 3048856r ` 40754921 2 , ´125734882980r3 ´ 134611455788r2 ´ 27256382584r ´ 182171881573 3475 r´11, 8, ´2, ´1s 11 p´ 1 7 r3 ´ 2 7 r2 ´ 4 7 r ` 1 7 q11p1qp1q 61 7 r3 ´ 214 7 r2 ´ 351 7 r ` 905 7 , ´ 1632 7 r3 ` 2420 7 r2 ` 6940 7 r ´ 10751 7 3475 r´11, 8, ´2, ´1s 11 p´rq11p1qp1q ´16r3 ´ 8r2 ` 24r ´ 95, 9008 7 r3 ` 5948 7 r2 ´ 8124 7 r ` 59025 7

Marc Masdeu Non-archimedean constructions September 28th, 2015 26 / 34

slide-28
SLIDE 28

Tables: quartic p2, 1q fields (III)

|∆K | fK pxq NmpNq pDm c4pEq, c6pEq 3559 r´2, ´1, 3, ´2s 20 pr2 ´ 1q5p1qp´r2 ` r ´ 2q4 266r3 ´ 251r2 ` 481r ` 402, ´8721r3 ` 6359r2 ´ 17561r ´ 13594 3571 r3, 5, ´5, ´1s 45 pr2 ´ 3q3pr2 ` r ´ 5q15p1q ´247r3 ` 1481r2 ` 5186r ` 1954, 313052r3 ` 544864r2 ´ 374892r ´ 240173 3632 r2, ´2, 0, ´2s 13 pr3 ´ r2 ´ r ´ 1q13p1qp1q 110352r3 ` 24580r2 ` 54624r ´ 99300, 124669648r3 ` 27763200r2 ` 61709112r ´ 112178880 3632 r2, ´2, 0, ´2s 14 p´r ´ 1q7p1qp´rq2 2474r3 ` 522r2 ` 1234r ´ 2217, 523532r3 ` 116757r2 ` 258994r ´ 471065 3632 r2, ´2, 0, ´2s 26 pr3 ´ r2 ´ 3q13p1qp´rq2 10028r3 ` 2232r2 ` 4964r ´ 9023, ´3562482r3 ´793354r2 ´1763358r`3205557 3723 r´1, 3, 1, ´1s 7 pr3 ´ r2 ` 2r ` 2q7p1qp1q 381r3 ´ 208r2 ´ 592r ` 201, ´9752r3 ´ 3598r2 ` 7307r ´ 1656 3723 r´1, 3, 1, ´1s 17 pr ´ 2q17p1qp1q 168r3 ´ 1126r2 ´ 1303r ` 504, ´24313r3 ` 42209r2 ` 63347r ´ 22837 3775 r´11, 7, 0, ´1s 19 p 3 8 r3 ´ 1 4 r2 ` 1 4 r ` 3 8 q19p1qp1q 36r3 ` 8r2 ` 32r ` 253, ´662r3 ´ 228r2 ´ 448r ´ 5011 3775 r´11, 7, 0, ´1s 19 p 3 8 r3 ´ 1 4 r2 ` 1 4 r ` 27 8 q19p1qp1q ´17r3 ` 30r2 ´ 70r ` 8, 489 2 r3 ´ 607r2 ` 1283r ´ 1633 2 3888 r3, ´6, 0, ´2s 3 p 1 2 r3 ´ 1 2 r2 ´ 1 2 r ´ 5 2 q3p1qp1q 12362r3 ` 8406r2 ` 22518r ´ 13842, 7035016r3`4781484r2`12812832r´7875996 3899 r´3, 1, 2, ´2s 23 pr3 ´ 2r2 ` r ` 1q23p1qp1q ´14r3 ` 14r2 ´ 25r ´ 21, 381r3 ´ 249r2 ` 364r ` 978 3967 r1, 5, ´2, ´1s 13 p 1 2 r3 ´ 2r ` 1 2 q13p1qp1q 3321 2 r3 ` 1456r2 ´ 2668r ´ 1081 2 , ´163448r3 ` 28056r2 ` 583644r ` 107371 3967 r1, 5, ´2, ´1s 17 p 1 2 r3 ´ 2r ` 5 2 q17p1qp1q ´ 3537 2 r3 ´ 125r2 ` 4948r ` 1841 2 , ´99064r3 ´ 306744r2 ´ 273576r ´ 41165 4108 r´2, ´2, 0, ´1s 52 pr2 ´ r ` 1q13p´r3 ` 2r2 ´ r ` 2q4p1q ´52r3 ` 56r2 ` 316r ` 177, 3676r3 ´ 2050r2 ´ 1438r ` 1283 4192 r´2, ´2, 1, 0s 28 pr2 ` r ` 1q7pr2 ` r ` 2q4p1q 68388r3 ´ 97900r2 ´ 25440r ` 47889, 50048814r3 ´ 57380110r2 ´ 27657416r ` 22526745 4192 r´2, ´2, 1, 0s 44 pr3 ` r ´ 1q11pr2 ` r ` 2q4p1q 993568r3 ´ 1182928r2 ´ 521264r ` 485673, ´2157501576r3 ` 964037714r2 ` 2148667444r ` 353613881 4204 r´4, ´2, 0, 0s 20 p´r ` 1q5p´rq4p1q 145360531282796r3 ` 161931312392192r2 ´ 390193058066092r ´ 440654493862007, ´1159392135670300645002r3 ` 9949620873463783912066r2 ´ 2497558503469317783050r ´ 17611520739674724691341 4319 r2, ´1, ´4, ´1s 42 prq2p´r3 ` 2r2 ` 3r ´ 1q21p1q 2626337501r3`4156522706r2`229413693r´ 2033846625, 694511908654437r3 ` 1099155960247844r2 ` 60666438159866r ´ 537832894958445 4384 r´4, 0, 3, ´2s 10 p 1 2 r3 ´ r2 ` 5 2 r ´ 2q5p1qp 1 2 r3 ` 1 2 r ` 2q2 ´39342r3 ` 91445r2 ` 10340r ´ 83032, ´8399230r3 ´ 58605841r2 ` 42062128r ` 73787052 4423 r1, 4, ´3, ´1s 50 p´r ` 2q5p´r2 ´ r ` 2q10p1q ´4642767r3 ´ 1724885r2 ` 13234188r ` 2913911, ´19031399895r3 ´ 11910891879r2 ` 44594523793r ` 10072542896 4423 r1, 4, ´3, ´1s 50 p´r ` 2q5p´r2 ´ r ` 2q10p1q 3516856r3 `2151917r2 ´8338704r´1880324, ´9366159063r3 ` 477887546r2 ` 34591729866r ` 7408649776 4564 r1, ´5, 0, ´1s 5 p 1 2 r3 ` r ´ 3 2 q5p1qp1q ´280r3 ` 240r2 ` 64r ` 1449, 10942r3 ´ 8954r2 ´ 1978r ´ 55513 4568 r´1, ´3, 2, ´1s 12 pr2 ` 2q3p1qpr2 ` 3q4 10845937505r3 ` 4588202505r2 ` 28221044093r ` 7621698413, ´1760006389370257r3 ´ 744542896235865r2 ´ 4579522784006957r ´ 1236798376628657 4652 r2, 5, ´3, ´1s 44 p 1 2 r3 ´ 3 2 r ` 2q11p´ 1 2 r3 ` 3 2 r ´ 1q4p1q ´1938032413r3 ` 62742964314r2 ` 143570326721r ` 41574563255, 14844318169935843r3 ` 50626339684931473r2 ` 49275897864569564r ` 11502761970012547 4663 r2, ´5, 2, ´1s 11 p´2r3 ` r2 ´ 3r ` 9q11p1qp1q 4296r3 ` 1705r2 ` 10968r ´ 6148, ´3722961r3 ´ 1477666r2 ´ 9510026r ` 5330364 4775 r´9, ´9, 2, ´1s 11 p´ 5 12 r3 ` 2 3 r2 ´ 5 6 r ` 13 4 q11p1qp1q 307 4 r3 ´ 499r2 ´ 2771 2 r ´ 2953 4 , ´ 69064 3 r3 ` 146785 3 r2 ´ 182723 3 r ´ 87279 4775 r´9, ´9, 2, ´1s 11 p 1 6 r3 ` 1 3 r2 ` 1 3 r ´ 1 2 q11p1qp1q 247r3 ` 539r2 ´ 163r ´ 335, ´41241r3 ´ 13659r2 ´ 21597r ´ 27719 4832 r´2, ´4, ´1, 0s 17 p´r3 ` r2 ` 2r ` 5q17p1qp1q ´24r3 ` 17r2 ` 12r ` 82, 580r3 ´ 347r2 ´ 524r ´ 1770 4907 r´1, ´4, ´2, ´1s 11 pr3 ´ r2 ´ 3r ´ 3q11p1qp1q ´191405r3 ´ 287504r2 ´ 336559r ´ 76491, 1214356660r3 ` 1824081112r2 ` 2135314036r ` 485335595 4944 r´1, ´4, ´1, 0s 17 pr3 ´ 4q17p1qp1q 316049736r3 ` 586633069r2 ` 772824316r ` 170272429, ´23749113529508r3 ´ 44081717952580r2 ´ 58072797643568r ´ 12794882314805 4979 r1, ´3, ´1, ´1s 13 p´r3 ` r2 ` r ` 1q13p1qp1q 32r3 ´ 128r2 ` 144r ´ 32, ´1464r3 ` 3856r2 ´ 1824r ` 240

Marc Masdeu Non-archimedean constructions September 28th, 2015 27 / 34

slide-29
SLIDE 29

Surfaces (joint with X. Guitart and H. Sengun)

This all generalizes to higer dimensional (e.g. 2-dim’l) components. The pairing H1pΓ0pNq, Zq ˆ H1pΓ0pNq, Zq Ñ Cˆ

p

yields, by taking bases of the irreducible factors, a lattice Λ Ă pCˆ

p q2.

Should correspond to the Cp-points of an abelian surface A split at p. From the lattice Λ one can compute the p-adic L-invariant Lp of a Mumford–Schottky genus 2 curve.

§ Lp P T b

Z Qp.

§ Corresponding to a hyperelliptic curve X with Jac X “ A.

We can use formulas of Teitelbaum (1988) to recover a Weierstrass equation for X from Lp. From this equation ❀ approximate Igusa invariants of X. Algebraic recognition algorithms ❀ actual Igusa invariants.

Marc Masdeu Non-archimedean constructions September 28th, 2015 28 / 34

slide-30
SLIDE 30

Toy example: an abelian surface over F “ Q

Consider the Shimura curve Xp15 ¨ 11q, which has genus g “ 9. One of the factors J of Jac Xp15 ¨ 11q is two-dimensional. T2 acts on J with characteristic polynomial P2pxq “ x2 ` 2x ´ 1. We compute a basis tφ1, φ2u of H1pΓ0p15 ¨ 11q, ZqT2“P2 and a “pseudo-dual basis” tθ1, θ2u of H1pΓ0p15 ¨ 11q, ZqT2“P2. The integration pairing yields a symmetric matrix ˆş

θ1 φ1

ş

θ2 φ1

ş

θ1 φ2

ş

θ2 φ2

˙ “ ˆA B B D ˙ . A “ 3 ¨ 114 ` 3 ¨ 115 ` 4 ¨ 116 ` ¨ ¨ ¨ ` Op1124q B “ 4 ` 7 ¨ 11 ` 7 ¨ 112 ` 4 ¨ 113 ` ¨ ¨ ¨ ` Op1120q D “ 9 ¨ 114 ` 9 ¨ 115 ` 8 ¨ 116 ` 9 ¨ 117 ` ¨ ¨ ¨ ` Op1121q

Marc Masdeu Non-archimedean constructions September 28th, 2015 29 / 34

slide-31
SLIDE 31

Toy example: an abelian surface over F “ Q (II)

This allows to recover the 11-adic L-invariant: L11pJ2q “ 3 ¨ 11 ` 8 ¨ 112 ` 3 ¨ 114 ` 9 ¨ 115 ` ¨ ¨ ¨ ` p7 ¨ 112 ` 3 ¨ 113 ` 5 ¨ 114 ` 2 ¨ 115 ` ¨ ¨ ¨ q ¨ T2 P T bQp. We recover the Igusa–Clebsch invariants pI2 : I4 : I6 : I10q “ p2584 : ´75356 : 37541976 : 2123453113q Mestre’s algorithm (together with model reduction) yields the hyperelliptic curve y2 “ ´x6 ` 4x4 ´ 10x3 ` 16x2 ´ 9 After twisting (by ´1 in this case) we get a curve whose first few Euler factors match with those obtained by the T-action on J.

Marc Masdeu Non-archimedean constructions September 28th, 2015 30 / 34

slide-32
SLIDE 32

Example surface over cubic p1, 1q field

Let F “ Qprq, where r3 ´ r2 ` 2r ´ 3 “ 0. Let p7 “ pr2 ´ r ` 1q. Let B{F be the totally definite quaternion algebra of disc. q3 “ prq. Jac XBpΓ0ppqq has a two-dimensional factor J. T2 acts on J with characteristic polynomial P2pxq “ x2 ` x ´ 10. A similar calculation as before recovers the 7-adic L-invariant: L7pJq “ 4 ¨ 7 ` 2 ¨ 72 ` 5 ¨ 73 ` 3 ¨ 74 ` 3 ¨ 75 ` ¨ ¨ ¨ ` Op7300q ` p72 ` 6 ¨ 74 ` 2 ¨ 75 ` 2 ¨ 76 ` ¨ ¨ ¨ ` Op7300qq ¨ T2 P T bQ7. Sadly, haven’t yet been able to recover Igusa–Clebsch invariants.

§ (We have about a dozen more examples over cubic and quartic

  • fields. . . )

Marc Masdeu Non-archimedean constructions September 28th, 2015 31 / 34

slide-33
SLIDE 33

Beyond degree 1

F “ quartic totally-complex field, N “ p (for simplicity). In this setting Γ “ SL2pOF r1{psq, which acts on H2

3.

The relevant groups are now H2pΓ, Div0 Hpq and H2pΓ, Ω1

Hpq.

§ H2pSL2pOF q, Div Hpq & H2pΓ0ppq, Dq – H2pSL2pOF q, coInd Dq. § The algorithms of J. Voight and A. Page do not extend to this situation.

What did the modular symbols algorithm teach us?

§ Exploit the cusps. . . § . . . use sharblies! Marc Masdeu Non-archimedean constructions September 28th, 2015 32 / 34

slide-34
SLIDE 34

Sharblies and overconvergent leezarbs

Have a short exact sequence of GL2pFq-modules 0 Ñ ∆0 Ñ Div P1pFq

deg

Ñ Z Ñ 0, ∆0 “ Div0 P1pFq Applying the functors p´q bV or Homp´, Wq and taking homology and cohomology yields connecting homomorphims H2pΓ0ppq, V q

δ

  • ˆ

H2pΓ0ppq, Wq

X

H0pΓ0ppq, V bWq

H1pΓ0ppq, ∆0 bV q ˆ H1pΓ0ppq, Homp∆0, Wqq

X δ

  • H0pΓ0ppq, Xq

ev˚

  • X “ ∆0 bV bHomp∆0, Wq ev

Ñ V bW, γ bv bφ ÞÑ v bφpγq. This diagram is “compatible”: θ X δpφq “ ev˚pδθ X φq. Reduced to H1pΓ0ppq, ∆0 bV q and H1pΓ0ppq, Homp∆0, Wqq.

Marc Masdeu Non-archimedean constructions September 28th, 2015 33 / 34

slide-35
SLIDE 35

Sharblies and overconvergent leezarbs (II)

Reduced to H1pΓ0ppq, ∆0 bV q and H1pΓ0ppq, Homp∆0, Wqq. Sharblies were invented by Szczarba and Lee (szczarb-lee) to compute with H1pΓ0ppq, ∆0 bV q.

§ Natural generalization of modular symbols to higher rank groups. ‹ Ash–Rudolph, Ash–Gunnells, . . . § Used to compute structure as hecke modules. ‹ Ash, Gunnells, Hajir, Jones, McConnell, Yasaki, . . . § They give an acyclic a resolution of ∆0 bV . § The analogue of continued fractions algorithm is “sharbly reduction”.

In order to compute H1pΓ0ppq, Homp∆0, Wqq, we introduce a dual version of sharblies, the leezarbs.

§ Leezarbs are an acyclic resolution of Homp∆0, Wq. § Can reuse the sharbly reduction algorithm to work with leezarbs. § This is work in progress with X. Guitart and A. Page, stay tuned! Marc Masdeu Non-archimedean constructions September 28th, 2015 34 / 34

slide-36
SLIDE 36

Thank you !

and

Congratulations to the people of Catalunya

Who have realized that, in the course of human events, it has become necessary to dissolve the political bands which have connected them with Spain.

Marc Masdeu Non-archimedean constructions September 28th, 2015 34 / 34