The graviton background at early times in string cosmology

Details The graviton background at early times in string cosmology The graviton background at early times in string cosmology

1997-01-14

arxiv.org/abs/gr-qc/9701030v1

Phys.Rev.D56:1320-1323,1997

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 1 figure, Latex

Scientific paper

10.1103/PhysRevD.56.1320

We discuss some peculiar properties of the stochastic graviton background predicted by string cosmology. At Planckian times, for the values of the parameters of the model which are more interesting for the detection in gravitational wave experiments, the number density of gravitons is parametrically large compared to Planck density, and is peaked at small energies. The large parameter is related to the duration of the string phase and is a characteristic of string cosmology. The typical interaction time is parametrically larger than the Planck or string time. Therefore the shape of the graviton spectrum is not distorted by thermal effects in the Planck era and can carry informations on the pre-big bang phase suggested by string cosmology.

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