Constraining scale dependent growth with redshift surveys
Denissenya M. Linder E.V.
1 November 2022Institute of Physics
Journal of Cosmology and Astroparticle Physics
2022#2022Issue 11
Ongoing and future redshift surveys have the capability to measure the growth rate of large scale structure at the percent level over a broad range of redshifts, tightly constraining cosmological parameters. Beyond general relativity, however, the growth rate in the linear density perturbation regime can be not only redshift dependent but scale dependent, revealing important clues to modified gravity. We demonstrate that a fully model independent approach of binning the gravitational strength G eff (k,z) matches scalar-tensor results for the growth rate fσ 8(k,z) to 0.02%-0.27% rms accuracy. For data of the quality of the Dark Energy Spectroscopic Instrument (DESI) we find the bin values can be constrained to 1.4%-28%. We also explore the general scalar-tensor form, constraining the amplitude and past and future scalaron mass/shape parameters. Perhaps most interesting is the strong complementarity of low redshift peculiar velocity data with DESI-like redshift space distortion measurements, enabling improvements up to a factor 6-7 on 2D joint confidence contour areas. Finally, we quantify some issues with gravity parametrizations that do not include all the key physics.
galaxy clustering , modified gravity , redshift surveys
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Energetic Cosmos Laboratory, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana, Kazakhstan
Berkeley Center for Cosmological Physics & Berkeley Lab, University of California, 1 Cyclotron Road, CA, Berkeley, 94720, United States
Energetic Cosmos Laboratory
Berkeley Center for Cosmological Physics & Berkeley Lab
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