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A short report on: joint thwg-cswg WP on Definition and selection of non- standard cosmological models CSWG WP5 numerical tools for non- standard cosmologies (Marco Baldi & Kazuya Koyama) Euclid CosmoSim Meeting - Barcelona, 4

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Euclid CosmoSim Meeting - Barcelona, 4 XII 2014

joint thwg-cswg WP on “Definition and selection of non- standard cosmological models” CSWG WP5 “numerical tools for non- standard cosmologies” (Marco Baldi & Kazuya Koyama) A short report on:

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Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

JOINT WP: GOALS AND ORGANISATION

The joint WP has been established at the last CM in Marseille, and is supposed to conclude its activities by the next CM in Lausanne

common mailing list for whole WP discussions: extended-cosmology-group@port.ac.uk The key documents are available on Redmine wiki: http://euclid.roe.ac.uk/projects/swg-th-wp12/wiki

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JOINT WP: GOALS AND ORGANISATION

AIMS: select a list of non-standard cosmologies for which non-linear

bservables are essential to fully exploit Euclid data and match

the broad Euclid science goals ➡ deliver a prioritised list of Reqs.

1.2 1.4 1.6 1.8 2.0 P(k)/PΛCDM(k)

EXP003 ΛCDM, σ8=0.967 z=0.00

1.2 1.4 1.6 1.8 2.0 P(k)/PΛCDM(k)

z=1.00

0.01 0.10 1.00 10.00 k [h/Mpc] 1.0 1.2 1.4 1.6 1.8 2.0 P(k)/PΛCDM(k)

z=3.02

10−2 10−1 100 101 k [h/Mpc] −0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 power spectrum enhancement Pf(R)/P

LCDM −1

| ¯ fR0| = 10−4 | ¯ fR0| = 10−5 | ¯ fR0| = 10−6 Li et al. 2012

MB 2012 Puchwein, MB, Springel 2013

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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JOINT WP: GOALS AND ORGANISATION

PARTICIPANTS: more than 60 people expressed interest. Too many for a focused discussion: the group has been divided into 9 sub-groups. SUB-GROUPS: each SG corresponds to one of the main classes of non- standard models identified by the THWG, plus an additional group “others”. Each group is coordinated by 2 SG leads, and is supposed to deliver a list of selected models for the respective class of NSC. SG 1 - Quintessence and EDE Leads: E. Linder, A. Fuzfa SG 2 - Inhomogeneous cosmologies Leads:

V. Marra, J. Garcia-Bellido

SG 3 - Warm Dark Matter Leads: J. Lesgorgues, M. Viel SG 4 - Primordial non-Gaussianity Leads:

V. Desjacques, S. Matarrese

SG 5 - Massive neutrinos Leads: J. Lesgorgues, C. Carbone SG 6 - Self-interacting Dark Matter Leads: T. Kitching, C. Germani SG 7 - Linear DE fluctuations Leads: P . Ferreira,

V. Pettorino

SG 8 - Nonlinear DE fluctutuations Leads: P . Brax, B. Li SG 9 - Others Leads: S. Camera, D. Bertacca

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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JOINT WP: GOALS AND ORGANISATION

June 15, 2014: Definition of the WP members list and of the

composition of the 9 sub-groups;

December 15, 2014: First draft of the models lists from the 9 WP

sub-groups;

February 15, 2015: Final document of the models lists from the 9

WP sub-groups;

April 15, 2015: Prioritization of the list of models based on a general

WP discussion;

May 31, 2015: Final Document on the Redmine wiki page.

SCHEDULE: activities should end by June 2015 MEMBERSHIP: the list of participants has been divided into SG leads, active members, and “observing members”

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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CSWG-WP5: GOALS AND ORGANISATION

AIMS: Develop, Validate, and Optimise numerical tools for non- standard cosmological models (i.e. anything beyond plain “vanilla” ΛCDM) Numerical tools include N-body codes, ICs generators, post- processing pipelines ORGANISATION: Most of the collaborative work is done through discussion sessions at meetings and conferences, much less by email or telecons. MEMORANDUM OF CODES: The first release (v1.0) is available on

RedMine. An updated release is planned for mid 2015

PARTICIPANTS: about 15-20 participants (number of active participants fluctuates)

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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CSWG-WP5: DEVELOPMENT PHASE

8. Non-linear spatial Dark Energy fluctuations
4. Non-Gaussian initial conditions
5. Massive Neutrinos
6. Self-Interacting Dark Matter
7. Linear spatial Dark Energy fluctuations
1. Quintessence and Early Dark Energy
2. Inhomogeneous large-void models
3. Warm Dark Matter

(quintessence, k-essence, phantom, quintom, EDE, etc...) (LTB, swiss-cheese, backreaction, etc...) (WDM, mixed Hot+Cold DM, etc...) (local, equilateral, orthogonal, running, etc...) (normal & inverted hierarchy) (velocity-dependent/independent X section) (clustering DE, coupled quintessence, extended quintessence) (massive coupled quintessence, Modified Gravity, etc...)

Development phase almost “concluded” (does that actually mean anything?) Not from EC members (M. Vogelsberger & J. Zavala)

✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

At least one working code, if not several, for each class

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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CSWG-WP5: VALIDATION PHASE

VALIDATION: presently ongoing code-comparison initiative for various types of Modified Gravity cosmologies.

Model Participating Codes Reference People

f(R)

mg-gadget ecosmog isis mg-enzo

M. Baldi, E. Puchwein
S. Bose
H. Winther
G. Zhao

Symmetron

ecosmog isis

B. Li
C. Llinares

DGP/Galileon

dgpm ecosmog

F. Schmidt
A. Barreira

INITIAL CONDITIONS: same for all runs, same IC code as ΛCDM code comparison (R. Smith) ANALYSIS: all runs analysed by the same person (H. Winther) with the same code (POWMES for the power spectrum, AHF for the mass function)

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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CSWG-WP5: VALIDATION PHASE

VALIDATION: some preliminary results from the code-comparison

0.9 0.92 0.94 0.96 0.98 1 1.02 1.04 1.06 0.1 1 10 PECOSMOG/PMGGADGET k (h/Mpc) F5 z=0.0 F5 z=0.5 F5 z=1.0 0.9 0.92 0.94 0.96 0.98 1 1.02 1.04 1.06 0.1 1 10 PISIS/PMGGADGET k (h/Mpc) F5 z=0.0 F5 z=0.5 F5 z=1.0

power spectrum

(plots from Hans Winther)

1% convergence at z = 0 up to k~1 isis seems to agree better with mg-gadget than ecosmog

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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CSWG-WP5: VALIDATION PHASE

VALIDATION: some preliminary results from the code-comparison

mass function

(plots from Hans Winther)

1 10 100 1000 10000 100000 1e+12 1e+13 1e+14 M (Msun/h) F5 MGGADGET z=0.0 F5 ISIS z=0.0 F5 ECOSMOG z=0.0 F5 MGGADGET z=0.5 F5 ISIS z=0.5 F5 ECOSMOG z=0.5 F5 MGGADGET z=1.0 F5 ISIS z=1.0 F5 ECOSMOG z=1.0 0.9 0.95 1 1.05 1.1 1e+12 1e+13 1e+14 ncode 1 / ncode 2 M (Msun/h) F5 nISIS/nMGGADGET z=0.0 F5 nECOSMOG/nMGGADGET z=0.0 F5 nISIS/nMGGADGET z=0.5 F5 nECOSMOG/nMGGADGET z=0.5 F5 nISIS/nMGGADGET z=1.0 F5 nECOSMOG/nMGGADGET z=1.0

15-20% scatter among the codes, especially at low masses mg-gadget has more small structures than the other codes

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama

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CSWG-WP5: FUTURE...

OPTIMISATION: We will need strategies to optimise the non-standard codes for large runs (not as large as EFS but as large as possible...) Most codes are extensions to the standard ΛCDM codes already under optimisation in Euclid: we should have access to optimised ΛCDM codes and port the modified modules into them. POST-PROCESSING: We will need to interface the modified codes with the post-processing pipelines built within Euclid (as e.g. light-cones on-the-fly generation, mock catalogues generation, etc...). So a common effort with the other CSWG WPs will be needed in the near future.

Euclid CosmoSim Meeting - Marco Baldi & Kazuya Koyama