Constraining the variation ofGby cosmic microwave background anisotropies

2006/11/30 by K. C. Chan, Kwan Chuen Chan, M. C. Chu +1
Earth and Planetary Sciences · Physics and Astronomy · #Anisotropy #Approx #Astrophysics #Black Holes and Theoretical Physics #Computer science #Cosmic microwave background #Cosmology and Gravitation Theories #Decoupling (probability) #Galaxy #Geophysics and Gravity Measurements #Physics #Quantum mechanics #Redshift #astro-ph

paper · pdf · doi:10.1103/physrevd.75.083521

published as Phys.Rev.D75:083521,2007 · 7 pages, 8 figures, discussion added, references added

openalex publication_date 2007/04/18 · arxiv created 2007/04/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We use the Cosmic Microwave Background Anisotropies (CMBA) power spectra to constrain the cosmological variation of gravitational constant G. It is found that the sensitivity of CMBA to the variation of G is enhanced when G is required to converge to its present value. The variations of G from the CMB decoupling epoch z\ensuremath∼1000 to the present time are modeled by a step function and a linear function of scale factor a respectively, and the corresponding 95% confidence intervals for G/G₀ are [0.95, 1.05] and [0.89, 1.13], G₀ being the present value. The CMBA constraint is unique in the sense that it entails the range of redshift from z\ensuremath≈1000 to 0.

Citations

• The fundamental constants and their variation: observational and theoretical status
• Probing the Friedmann equation during recombination with future cosmic microwave background experiments
• Time variation of G and within models with extra dimensions
• Final Results from theHubble Space TelescopeKey Project to Measure the Hubble Constant