Early universe constraints from gravitational waves

Details Early universe constraints from gravitational waves Early universe constraints from gravitational waves

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204l..11l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. L11-L13.

Astronomy and Astrophysics

Astrophysics

2

Gravitational Waves, Relic Radiation, Universe, Constraints, String Theory

Scientific paper

Very sensitive constraints can be placed on the gravitational wave energy density during and after the epoch of last scattering of the cosmic microwave background radiation. Observational limits on the temperature anisotropies that would be induced by the Sachs-Wolfe effect then give spectrum-dependent constraints on early universe processes that generate long wavelength gravitational waves. In particular, a derived upper bound on the Hubble constant during an inflationary era, implies a symmetry breaking scale MX < 9×1015GeV.Similarly, cosmic strings with tensions Gμ > 1×10-5 violate the microwave background limits.

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