Graviton Spectra in String Cosmology

Journal Article · Fri Aug 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.970· OSTI ID:528135

Galluccio, M; Occhionero, F ^[1]; Litterio, M ^[2]

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1. Osservatorio Astronomico di Roma, Via del Parco Mellini 84, 00136 Roma (Italy)
2. Istituto Astronomico dell`Universita La Sapienza, Via G. M. Lancisi 29, 00186 Roma (Italy)

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}{sup 3} increase and initiates an {omega}{sup {minus}7} decrease, is induced during the so far overlooked bounce of the scale factor between the collapsing deflationary era (or pre{endash}big bang) and the expanding inflationary era (or post{endash}big bang). The frequency and the intensity of the peak may likely fall in the realm of the new generation of interferometric detectors. The existence of a peak, at variance with ordinarily monotonic graviton spectra, would therefore offer strong support to string cosmology. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 528135
• Journal Information: Physical Review Letters, Vol. 79, Issue 6; Other Information: PBD: Aug 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GRAVITONS
SPECTRA
COSMOLOGY
STRING MODELS
INFLATIONARY UNIVERSE
GRAVITATIONAL WAVES