Graviton background at early times in string cosmology

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.1320· OSTI ID:527101

Maggiore, M ^[1]

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1. INFN, sezione di Pisa, and Dipartimento di Fisica dellUniversita, piazza Torricelli 2, I-56100 Pisa (Italy)

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. When the gravitons reenter the horizon their typical interaction time is parametrically larger than the expansion time and therefore the shape of the graviton spectrum is not distorted by graviton-graviton rescattering and can carry information on the pre-big-bang phase suggested by string cosmology. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 527101
• Journal Information: Physical Review, D, Vol. 56, Issue 2; Other Information: PBD: Jul 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
STRING MODELS
GRAVITONS
COSMOLOGICAL MODELS
COSMOLOGY
GRAVITATIONAL WAVES
DENSITY
FLUCTUATIONS
INFLATIONARY UNIVERSE
MAGNETIC FIELDS