Graviton Spectra in String Cosmology

Details Graviton Spectra in String Cosmology Graviton Spectra in String Cosmology

1996-08-02

arxiv.org/abs/gr-qc/9608007v1

Phys.Rev.Lett. 79 (1997) 970-973

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, RevTex source and 6 figures.ps

Scientific paper

10.1103/PhysRevLett.79.970

We propose to uncover the signature of a stringy era in the primordial Universe by searching for a prominent peak in the relic graviton spectrum. This feature, which in our specific model terminates an $\omega^3$ increase and initiates an $\omega^{-7}$ decrease, is induced during the so far overlooked bounce of the scale factor between the collapsing deflationary era (or pre-Big Bang) and the expanding inflationary era (or post-Big Bang). We evaluate both analytically and numerically the frequency and the intensity of the peak and we show that they may likely fall in the realm of the new generation of interferometric detectors. The existence of a peak is at variance with ordinarily monotonic (either increasing or decreasing) graviton spectra of canonical cosmologies; its detection would therefore offer strong support to string cosmology.

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