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Phys. Rev. D 80, 023508 (2009) [7 pages]

From Cavendish to PLANCK: Constraining Newton’s gravitational constant with CMB temperature and polarization anisotropy

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Silvia Galli*
Physics Department, Universita’ di Roma “La Sapienza”, Ple Aldo Moro 2, 00185, Rome, Italy, and Laboratoire Astroparticule et Cosmologie (APC), Universite’ Paris Diderot - 75205 PARIS cedex 13

Alessandro Melchiorri†
Physics Department and INFN, Universita’ di Roma “La Sapienza”, Ple Aldo Moro 2, 00185, Rome, Italy

George F. Smoot‡ and Oliver Zahn§
Lawrence Berkeley National Laboratory and Berkeley Center for Cosmological Physics Physics Department, University of California, Berkeley California 94720, USA

Received 19 May 2009; published 10 July 2009

We present new constraints on cosmic variations of Newton’s gravitational constant by making use of the latest CMB data from WMAP, BOOMERANG, CBI and ACBAR experiments and independent constraints coming from big bang nucleosynthesis. We found that current CMB data provide constraints at the ∼10% level, that can be improved to ∼3% by including big bang nucleosynthesis data. We show that future data expected from the Planck satellite could constrain G at the ∼1.5% level while an ultimate, cosmic variance limited, CMB experiment could reach a precision of about 0.4%, competitive with current laboratory measurements.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.80.023508
DOI:
10.1103/PhysRevD.80.023508
PACS:
98.80.−k, 95.85.Sz, 98.70.Vc, 98.80.Cq

*galli@apc.univ-paris7.fr

†alessandro.melchiorri@roma1.infn.it

‡gfsmoot@lbl.gov

§zahn@berkeley.edu

 
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