Gravitational waves and cosmological back reaction

Details Gravitational waves and cosmological back reaction Gravitational waves and cosmological back reaction

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.228a2054c&link_type=abstract

Journal of Physics: Conference Series, Volume 228, Issue 1, pp. 012054 (2010).

Physics

Scientific paper

Cosmological back reaction of gravitational waves and matter density fluctuations is revisited through a new general mean field theory of relativistic gravitation. Computations are done for all wave-lengths and Isaacson's results are confirmed for high-frequency waves. It is found that back reaction is typically much stronger for gravitational waves than for matter density fluctuations. In particular, a bath of gravitational waves of relative amplitude 10-5 and frequency 10-12 Hz (compatible with today's constraints) would generate an effective large-scale radiation of amplitude comparable to the unperturbed matter density of the universe.

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