Singling out modified gravity parameters and data sets reveals a dichotomy between Planck and lensing

Garcia-Quintero, Cristhian; Ishak, Mustapha

doi:10.1093/mnras/stab1773

Cited by 3 publications

(2 citation statements)

References 59 publications

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“…Refs. [122,132,133]. The distinction between our binned σ 8 (z) model and modified gravity parameterizations is largely one of interpretation rather than modeling specifics.…”

Section: F Binned σ8(z)mentioning

confidence: 99%

Dark Energy Survey Year 3 results: Constraints on extensions to ΛCDM with weak lensing and galaxy clustering

Abbott¹,

Aguena²,

Alarcón³

et al. 2023

Phys. Rev. D

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We constrain six possible extensions to the ΛCDM model using measurements from the Dark Energy Survey's first three years of observations, alone and in combination with external cosmological probes. The DES data are the two-point correlation functions of weak gravitational lensing, galaxy clustering, and their crosscorrelation. We use simulated data vectors and blind analyses of real data to validate the robustness of our results to astrophysical and modeling systematic errors. In many cases, constraining power is limited by the absence of theoretical predictions beyond the linear regime that are reliable at our required precision. The ΛCDM extensions are: dark energy with a time-dependent equation of state, non-zero spatial curvature, additional relativistic degrees of freedom, sterile neutrinos with eV-scale mass, modifications of gravitational physics, and a binned σ8(z) model which serves as a phenomenological probe of structure growth. For the time-varying dark energy equation of state evaluated at the pivot redshift we find (wp, wa) = (−0.99 +0.28 −0.17 , −0.9 ± 1.2) at 68% confidence with zp = 0.24 from the DES measurements alone, and (wp, wa) = (−1.03 +0.04 −0.03 , −0.4 +0.4 −0.3 ) with zp = 0.21 for the combination of all data considered. Curvature constraints of Ω k = 0.0009 ± 0.0017 and effective relativistic species N eff = 3.10 +0.15 −0.16 are dominated by external data, though adding DES information to external low redshift probes tightens the Ω k constraints that can be made without CMB observables by 20%. For massive sterile neutrinos, DES combined with external data improves the upper bound on the mass m eff by a factor of three compared to previous analyses, giving 95% limits of (∆N eff , m eff ) ≤ (0.28, 0.20 eV) when using priors matching a comparable Planck analysis. For modified gravity, we constrain changes to the lensing and Poisson equations controlled by functions Σ(k, z) = Σ0ΩΛ(z)/ΩΛ,0 and µ(k, z) = µ0ΩΛ(z)/ΩΛ,0 respectively to Σ0 = 0.6 +0.4 −0.5 from DES alone and (Σ0, µ0) = (0.04 ± 0.05, 0.08 +0.21 −0.19 ) for the combination of all data, both at 68% confidence. Overall, we find no significant evidence for physics beyond ΛCDM.

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“…Refs. [122,132,133]. The distinction between our binned σ 8 (z) model and modified gravity parameterizations is largely one of interpretation rather than modeling specifics.…”

Section: F Binned σ8(z)mentioning

confidence: 99%

Dark Energy Survey Year 3 results: Constraints on extensions to ΛCDM with weak lensing and galaxy clustering

Abbott¹,

Aguena²,

Alarcón³

et al. 2023

Phys. Rev. D

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“…Studies evolved from the phenomenology of specific models, such as f (R) [21][22][23][24] and DGP [25,26], to the development of general frameworks [27][28][29][30][31][32][33][34] for studying broad classes of modified gravity theories, such as Horndeski [35,36] and beyond [37][38][39][40], along with the numerical tools for interpreting observations within these frameworks, such as EFTCAMB [41][42][43] and hi_class [44,45]. The essential difference between MGCAMB (and similar software, like MGCLASS [46] and ISiTGR [47][48][49]) and codes like EFTCAMB and hi_class is that the latter JCAP08(2023)038 are exact tools for testing scalar-tensor theories, albeit of most general type, while the former are purely phenomenological, helping constrain departures from GR that are more directly probed by large-scale structure surveys. In practice, one always has to choose a particular parameterization and such choices are often driven by intuition gained from scalar-tensor theories.…”

Section: Introductionmentioning

confidence: 99%

New MGCAMB tests of gravity with CosmoMC and Cobaya

Wang

Mirpoorian

Pogosian

et al. 2023

J. Cosmol. Astropart. Phys.

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We present a new version of MGCAMB, a patch for the Einstein-Boltzmann solver CAMB for cosmological tests of gravity. New features include a new cubic-spline parameterization allowing for a simultaneous reconstruction of μ, Σ and the dark energy density fraction Ω X as functions of redshift, the option to work with a direct implementation of μ, Σ (instead of converting to μ, γ first), along with the option to test models with a scalar field coupled only to dark matter, and the option to include dark energy perturbations when working with w ≠ -1 backgrounds, to restore consistency with CAMB in the GR limit. This version of MGCAMB comes with a Python wrapper to run it directly from the Python interface, an implementation in the latest version of CosmoMC, and can be used with Cobaya.

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Exploring modified gravity: constraints on the μ and Σ parametrization with WMAP, ACT, and SPT

Andrade,

Capistrano,

Di Valentino

et al. 2024

Monthly Notices of the Royal Astronomical Society

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The cosmic acceleration problem remains one of the most significant challenges in cosmology. One of the proposed solutions to this problem is the modification of gravity on large scales. In this paper, we explore the well-known μ-Σ parametrization scenarios and confront them with observational data, including the cosmic microwave background (CMB) radiation from the Wilkinson Microwave Anisotropy Probe (WMAP), Atacama Cosmology Telescope (ACT), and South Pole Telescope (SPT), as well as large-scale structure data from the Sloan Digital Sky Survey (SDSS: BAO+RSD) and Pantheon Supernovae (SN) catalog. We employ a Bayesian framework to constrain the model parameters and discuss the implications of our results on the viability of modified gravity theories. Our analysis reveals the strengths and limitations of the μ-Σ parametrization and provides valuable insights into the nature of gravity on cosmological scales. From the joint analysis of the ACT + WMAP + SDSS + SN, we find μ0 − 1 = 0.02 ± 0.19 and Σ0 − 1 = 0.021 ± 0.068 at 68% CL. In light of the SPT + WMAP + SDSS + SN, we find μ0 − 1 = 0.07 ± 0.18 and $\Sigma _0 -1 = -0.009^{+0.078}_{-0.11}$ at 68% CL. In all the analyses carried out, we do not find any deviations from the theory of general relativity. Our results represent an observational update on the well-known μ-Σ parameterization in view of current CMB data, independent and competitive with the constraints obtained with the Planck data.

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Singling out modified gravity parameters and data sets reveals a dichotomy between Planck and lensing

Cited by 3 publications

References 59 publications

Dark Energy Survey Year 3 results: Constraints on extensions to ΛCDM with weak lensing and galaxy clustering

Dark Energy Survey Year 3 results: Constraints on extensions to ΛCDM with weak lensing and galaxy clustering

New MGCAMB tests of gravity with CosmoMC and Cobaya

Exploring modified gravity: constraints on the μ and Σ parametrization with WMAP, ACT, and SPT

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