Probing the time variation of the effective Newton's constant with optimal redshift weights

Jian Li, Gong-Bo Zhao

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Abstract

We propose a new method for probing the time variation of the effective Newton's constant Geff, based on the optimal redshift weighting scheme, and demonstrate the efficacy using the DESI galaxy spectroscopic survey. We find that with the optimal redshift weights, the evolution of Geff(z) can be significantly better measured: the uncertainty of Geff(z) can be reduced by a factor of 2.2 ∼ 12.8 using the DESI BGS sample at ≲ 0.45, and by a factor of 1.3 ∼ 4.4 using the DESI Emission Line Galaxies sample covering 0.65 ≲ z ≲ 1.65.
Original languageEnglish
Article number32
Number of pages7
JournalThe Astrophysical Journal
Volume877
Issue number1
DOIs
Publication statusPublished - 31 May 2019

Keywords

  • astro-ph.CO

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