Constraining the variation of G by cosmic microwave background anisotropies

Journal Article · Sun Apr 15 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.083521· OSTI ID:21020363

Chan, K C; Chu, M -C ^[1]

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1. Department of Physics and Institute of Theoretical Physics, Chinese University of Hong Kong, Hong Kong (China)

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{approx}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/G{sub 0} are [0.95, 1.05] and [0.89, 1.13], G{sub 0} being the present value. The CMBA constraint is unique in the sense that it entails the range of redshift from z{approx_equal}1000 to 0.

• OSTI ID: 21020363
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 8; Other Information: DOI: 10.1103/PhysRevD.75.083521; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
COSMIC RADIATION
COSMOLOGY
DECOUPLING
ENERGY SPECTRA
FUNDAMENTAL CONSTANTS
RADIOWAVE RADIATION
RELICT RADIATION
SENSITIVITY
VARIATIONS