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Constraints on f(R) and normal-branch Dvali-Gabadadze-Porrati modified gravity model parameters with cluster abundances and galaxy clustering

Journal Article · · Physical Review. D.
 [1];  [2];  [3];  [3]
  1. Cornell University, Ithaca, NY (United States); OSTI
  2. Harvard University, Cambridge, MA (United States)
  3. Cornell University, Ithaca, NY (United States)
In this report we present forecasted cosmological constraints from combined measurements of galaxy cluster abundances from the Simons Observatory and galaxy clustering from a DESI-like experiment on two well-studied modified gravity models, the chameleon-screened Hu-Sawicki f(R) model and the nDGP braneworld Vainshtein model. A Fisher analysis is conducted using σ8 constraints derived from thermal Sunyaev-Zel’dovich (tSZ) selected galaxy clusters as well as linear and quasilinear redshift-space 2-point galaxy correlation functions. We find that the cluster abundances drive the constraints on the nDGP model while f(R) constraints are led by galaxy clustering. The two tracers of the cosmological gravitational field are found to be complementary, and their combination significantly improves constraints on the f(R) in particular in comparison to each individual tracer alone. For a model of f(R) with a general relativity (GR) fiducial case (fR0 = 0), we find a 2-σ upper limit of fR0 ≤ 5.68 x10-7. For the well-studied log-based fiducial parameter value in f(R), log10(fR0) = -5, paired with the parameter value n = 1, we find combined 1-σ constraints of σ(log10(fR0)) = 0.12 and σ(n) = 0.36. For the nDGP model with fiducial nnDGP = 1 we find σ( nnDGP) = 0.087. Our results present the exciting potential to utilize upcoming galaxy and CMB survey data available in the near future to discern and/or constrain cosmic deviations from GR.
Research Organization:
Cornell University, Ithaca, NY (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
SC0011838
OSTI ID:
1979954
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 10 Vol. 104; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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