New MGCAMB tests of gravity with CosmoMC and Cobaya

Wang, Zhuangfei; Mirpoorian, Seyed Hamidreza; Pogosian, Levon; Silvestri, Alessandra; Zhao, Gong-Bo

doi:10.1088/1475-7516/2023/08/038

J. Cosmol. Astropart. Phys.

2023

DOI: 10.1088/1475-7516/2023/08/038

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New MGCAMB tests of gravity with CosmoMC and Cobaya

Zhuangfei Wang

Seyed Hamidreza Mirpoorian

Levon Pogosian

et al.

Abstract: 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, … Show more

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2024

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Cited by 10 publications

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Constraining f(R) gravity with cross-correlation of galaxies and cosmic microwave background lensing

Kou,

Murray,

Bartlett

2024

A&A

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We look for signatures of the Hu-Sawicki modified gravity theory proposed to explain the observed accelerated expansion of the Universe in observations of the galaxy distribution, the cosmic microwave background (CMB), and gravitational lensing of the CMB. We study constraints obtained using observations of only the CMB primary anisotropies before adding the galaxy power spectrum and its cross-correlation with CMB lensing. We show that cross-correlation of the galaxy distribution with lensing measurements is crucial in order to break parameter degeneracies, placing tighter constraints on the model. In particular, we set a strong upper limit on $ at $95<!PCT!>$ confidence level. This means that while the model may explain the accelerated expansion, its impact on large-scale structure closely resembles general relativity (GR). This analysis is the first to make use of the galaxy clustering, CMB lensing, and their cross-correlation power spectra to constrain Hu-Sawicki gravity. Restricting the analysis to the linear regime, we place a robust constraint that is competitive with other cosmological studies whilst using fewer probes. This study can be seen as a precursor to cross-correlation analyses of gravity and can be repeated with next-stage surveys, which will benefit from lower noise and hence probe smaller potential deviations from GR.

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Constraining f(R) gravity with cross-correlation of galaxies and cosmic microwave background lensing

Kou,

Murray,

Bartlett

2024

A&A

View full text Add to dashboard Cite

show abstract

The SRG/eROSITA All-Sky Survey

Artis,

Ghirardini,

Bulbul

et al. 2024

A&A

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The evolution of the cluster mass function traces the growth of the linear density perturbations and can be utilized to constrain the parameters of cosmological and alternative gravity models. In this context, we present new constraints on potential deviations from general relativity by investigating the Hu-Sawicki parametrization of the $f(R)$ gravity with the first Spectrum Roentgen Gamma (SRG)/ All-Sky Survey ( cluster catalog in the western Galactic hemisphere in combination with the overlapping Dark Energy Survey Year-3, KiloDegree Survey, and Hyper Suprime-Cam data for weak lensing mass calibration. For the first time, we present constraints obtained from cluster abundances only. When we consider massless neutrinos, we find a strict upper limit of $ f_ R0 | < -4.31$ at a 95<!PCT!> confidence level. Massive neutrinos suppress structure growth at small scales, and thus have the opposite effect of $f(R)$ gravity. We consequently investigate the joint fit of the mass of the neutrinos with the modified gravity parameter. We obtain $ f_ R0 | < -4.08$ jointly with $ m_ eV $ at a 95<!PCT!> confidence level, which is tighter than the limits in the literature utilizing cluster counts only. At $ f_ R0 |= - 6$, the number of clusters is not significantly changed by the theory. Consequently, we do not find any statistical deviation from general relativity in the study of eRASS1 cluster abundance. Deeper surveys with eROSITA, increasing the number of detected clusters, will further improve constraints on $ |f_ R0 |$ and investigate alternative gravity theories.

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Stage-IV cosmic shear with Modified Gravity and model-independent screening

Tsedrik,

Bose,

Carrilho

et al. 2024

J. Cosmol. Astropart. Phys.

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We forecast constraints on minimal model-independent parametrisations of several Modified Gravity theories using mock Stage-IV cosmic shear data. We include nonlinear effects and screening, which ensures recovery of General Relativity on small scales. We introduce a power spectrum emulator to accelerate our analysis and evaluate the robustness of the growth index parametrisation with respect to two cosmologies: ΛCDM and the normal branch of the DGP model. We forecast the uncertainties on the growth index γ to be of the order ∼ 10%. We find that our halo-model based screening approach demonstrates excellent performance, meeting the precision requirements of Stage-IV surveys. However, neglecting the screening transition results in biased predictions for cosmological parameters. We find that the screening transition shows significant degeneracy with baryonic feedback, requiring a much better understanding of baryonic physics for its detection. Massive neutrinos effects are less prominent and challenging to detect solely with cosmic shear data.

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New MGCAMB tests of gravity with CosmoMC and Cobaya

Cited by 10 publications

References 99 publications

Constraining f(R) gravity with cross-correlation of galaxies and cosmic microwave background lensing

Constraining f(R) gravity with cross-correlation of galaxies and cosmic microwave background lensing

The SRG/eROSITA All-Sky Survey

Stage-IV cosmic shear with Modified Gravity and model-independent screening

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