Marco Baldi & Kazuya Koyama Brief summary of the conference The - - PowerPoint PPT Presentation

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Apr 29, 2023 120 likes •441 views

Marco Baldi & Kazuya Koyama Brief summary of the conference The Quest for Dark Energy: when theory meets simulations @ Ringberg Castle, Germany Cosmological models beyond the standard CDM are attracting more and more attention

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Marco Baldi & Kazuya Koyama Brief summary of the conference “The Quest for Dark Energy: when theory meets simulations” @ Ringberg Castle, Germany

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Cosmological models beyond the standard ΛCDM are attracting more and more attention lately (maybe also because of Euclid?) Several conferences and meetings devoted to non-standard cosmologies are taking place... Just to give an idea, my personal agenda of the last month has been: June 18-20, Paris: 17th Itzykson meeting “Heart of Darkness: Dark Energy and Modified Gravity” June 24-29, Ringberg: International conference “The quest for Dark Energy: when theory meets simulations” July 2-6, Sesto: International conference “Beyond ΛCDM: from dark matter halos to large-scale structures”

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Cosmological models beyond the standard ΛCDM are attracting more and more attention lately (maybe also because of Euclid?) Several conferences and meetings devoted to non-standard cosmologies are taking place... Just to give an idea, my personal agenda of the last month has been: June 18-20, Paris: 17th Itzykson meeting “Heart of Darkness: Dark Energy and Modified Gravity” June 24-29, Ringberg: International conference “The quest for Dark Energy: when theory meets simulations” July 2-6, Sesto: International conference “Beyond ΛCDM: from dark matter halos to large-scale structures”

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The conference website

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45 participants, 8 talks sessions: 3 on theory, 3 on simulations, 2 on observations The conference venue

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Overview on Dark Energy and Modified Gravity simulations

  • M. Baldi

Simulations of quintessence models: P . S. Corasaniti (The DEUS Full Universe Run)

  • L. Casarini (shear spectra from simulations)

Baryonic effects in simulations

  • A. Maccio’ (supernova feedback)
  • J. Schaye (AGN feedback)

Simulations of interacting dark energy and modified gravity

  • Y. Ayaita (simulations of growing neutrinos)
  • B. Li (the modified gravity code ecosmog)
  • E. Puchwein (The modified gravity code mg-gadget)
  • F. Schmidt (a modified gravity code for

Vainshtein screenings)

  • H. Winther (voids in modified gravity)
  • C. Llinares (cluster shapes in modified gravity)
  • G. B. Zhao (environmental effects in modified gravity)
  • E. Jennings (redshift-space distortions in modified gravity)

Topics within the simulations sessions

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Marco Baldi - Dark Energy Simulations - Ringberg, 25 VI 2012

time evolution spatial fluctuations interactions

Λ

✘ ✘ ✘

Dynamical DE

(quintessence, k-essence, EDE)

✔

a dynamical (scalar) degree of freedom

✘

no clustering at sub-horizon scales

✘

minimally-coupled to matter fields

Clustering DE

(“cold” DE models)

✔

a dynamical (scalar) degree of freedom

✔

small sound speed, clustering at sub-H

✘

minimally coupled to matter

Interacting DE

(Coupled and Extended Quintessence, Modified Gravity)

✔

a dynamical (scalar) degree of freedom

✔

fluctuations sourced by the interaction

✔

non-minimally coupled to matter

  • M. Baldi: overview on N-body & DE
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Summary of the results obtained in the last 10 years on DE

  • bservational features from N-body simulations

Marco Baldi - Dark Energy Simulations - Ringberg, 25 VI 2012

  • M. Baldi: overview on N-body & DE
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Summary of the results obtained in the last 10 years on DE

  • bservational features from N-body simulations

Marco Baldi - Dark Energy Simulations - Ringberg, 25 VI 2012

Variable couplings can produce opposite effects with respect to constant couplings on the nonlinear matter power spectrum, the density profiles, and the c-M relation

MB 2011 gadget (TreePM)

  • M. Baldi: overview on N-body & DE
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Summary of the results obtained in the last 10 years on DE

  • bservational features from N-body simulations

Marco Baldi - Dark Energy Simulations - Ringberg, 25 VI 2012

Variable couplings can produce opposite effects with respect to constant couplings on the nonlinear matter power spectrum, the density profiles, and the c-M relation

MB 2011 gadget (TreePM) CMB normalization!!! MB & Pettorino 2011; MB 2012

cDE can increase the number of high-z massive clusters even for CMB normalization, and for the case of a SUGRA potential, even for a simultaneous CMB and z=0 normalization

gadget (TreePM)

  • M. Baldi: overview on N-body & DE
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Summary of the results obtained in the last 10 years on DE

  • bservational features from N-body simulations

Marco Baldi - Dark Energy Simulations - Ringberg, 25 VI 2012

Variable couplings can produce opposite effects with respect to constant couplings on the nonlinear matter power spectrum, the density profiles, and the c-M relation

MB 2011 gadget (TreePM) CMB normalization!!! MB & Pettorino 2011; MB 2012

cDE can increase the number of high-z massive clusters even for CMB normalization, and for the case of a SUGRA potential, even for a simultaneous CMB and z=0 normalization

gadget (TreePM)

http://www.usm.lmu.de/~mbaldi/CoDECS

Large N-body simulations of several different cDE models are now publicly available through the CoDECS Project

gadget (TreePM)

  • M. Baldi: overview on N-body & DE
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Y . Ayaita: simulations of growing ν

The formation of large-scale neutrino lumps including relativistic corrections, mass perturbations, and the backreaction effect

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Y . Ayaita: simulations of growing ν

The formation of large-scale neutrino lumps including relativistic corrections, mass perturbations, and the backreaction effect

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  • B. Li: the MG code ECOSMOG
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status of simulations: codes

  • B. Li: the MG code ECOSMOG
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status of simulations: codes

工欲善其事，必先利其器

ECOSMOG

  • ne who wants to get things well done must first have tools well prepared

extended quintessence coupled quintessence f(R) gravity G chameleon G symmetron G dilaton

  • B. Li: the MG code ECOSMOG
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status of simulations: runs

models box size N particle N mesh N realisation

f(R) w/ fR0 = 1e-5 f(R) w/ fR0 = 1e-5 f(R) w/ fR0 = 1e-6/5/4 f(R) w/ fR0 = 1e-6/5/4 f(R) w/ fR0 = 1e-6/5/4 f(R) w/ fR0 = 1e-6/5/4 f(R) w/ fR0 = 1e-6/5/4 f(R) w/ fR0 = 1e-6/5/4 f(R) w/ fR0 = 1e-6/5/4 generalised chameleon generalised symmetron generalised dilaton

32Mpc/h 128^3 128^3 20 64Mpc/h 256^3 256^3 10 100Mpc/h 256^3 256^3 5 128Mpc/h 512^3 512^3 5 250Mpc/h 512^3 512^3 1 250Mpc/h 1024^3 1024^3 1 500Mpc/h 512^3 512^3 1 1.0Gpc/h 1024^3 1024^3 1 1.5Gpc/h 1024^3 1024^3 6 128Mpc/h 256^3 256^3 10 X 5 128Mpc/h 256^3 256^3 10 X 5 128Mpc/h 256^3 256^3 12 X 5

  • B. Li: the MG code ECOSMOG
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a general evolution path

HS f(R) model fR0 = 1e-6 stage b HS f(R) model fR0 = 1e-5 end of stage ci HS f(R) model fR0 = 1e-4 well into stage cii

  • B. Li: the MG code ECOSMOG
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  • E. Puchwein: the MG code MG-GADGET

A version of Gadget suitable for modified gravity models. The nonlinear Poisson solver is based on “adaptive tree refinement”

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  • E. Puchwein: the MG code MG-GADGET

A version of Gadget suitable for modified gravity models. The nonlinear Poisson solver is based on “adaptive tree refinement”

Puchwein, MB & Springel, in prep.

mg-gadget ecosmog

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F . Schmidt: simulating Vainshtein

N-body solver for modified gravity theories with Vainshtein screening mechanism

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F . Schmidt: simulating Vainshtein

N-body solver for modified gravity theories with Vainshtein screening mechanism

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F . Schmidt: simulating Vainshtein

N-body solver for modified gravity theories with Vainshtein screening mechanism

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  • H. Winther: voids in modified gravity

Statistics and density profiles of voids from the Symmetron N-body simulations by Davis et al. 1108.3081

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  • H. Winther: voids in modified gravity

Statistics and density profiles of voids from the Symmetron N-body simulations by Davis et al. 1108.3081

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  • H. Winther: voids in modified gravity

Statistics and density profiles of voids from the Symmetron N-body simulations by Davis et al. 1108.3081

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G.B. Zhao: environmental dependence

Mass difference between dynamical and lensing mass due to environmental dependent screening as appearing in simulations

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G.B. Zhao: environmental dependence

Mass difference between dynamical and lensing mass due to environmental dependent screening as appearing in simulations

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  • E. Jennings: RSD in modified gravity

Density and velocity power spectra extracted from large N-body simulations of f(R) models

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  • E. Jennings: RSD in modified gravity

Density and velocity power spectra extracted from large N-body simulations of f(R) models

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Conclusions

The Ringberg conference brought together experts in theoretical modeling and numerical simulations of non-standard DE scenarios The simulations sessions have shown that an impressive number

  • f independent efforts towards simulating DE/MG models are

being pursued in the community Multiple independent codes based on different basic algorithms have been developed, and could now be tested against each

  • ther

Some first post-processing tools are also being developed and start providing results on possible specific diagnostics about the nature of gravity and DE General agreement that DE and MG should be treated as a single phenomenon