Relic Gravitational Waves from String Cosmology
نویسندگان
چکیده
A large class of string-cosmology backgrounds leads to a spectrum of relic stochastic gravitational waves, strongly tilted towards high frequencies, and characterized by two basic parameters of the cosmological model. We estimate the required sensitivity for detection of the predicted gravitational radiation and show that a region of our parameter space is within reach for some of the planned gravitational-wave detectors. CERN-TH/95-144 June 1995
منابع مشابه
Spectrum of relic gravitational waves in string cosmology
We compute the spectrum of relic gravitons in a model of string cosmology. In the lowand in the high-frequency limits we reproduce known results. The full spectrum, however, also displays a series of oscillations which could give a characteristic signature at the planned LIGO/VIRGO detectors. For special values of the parameters of the model the signal reaches its maximum already at frequencies...
متن کاملDetecting relic gravitational radiation from string cosmology with LIGO
A characteristic spectrum of relic gravitational radiation is produced by a period of ‘‘stringy inflation’’ in the early Universe. This spectrum is unusual, because the energy density rises rapidly with frequency. We show that correlation experiments with the two gravitational-wave detectors being built for the Laser Interferometric Gravitational Wave Observatory could detect this relic radiati...
متن کاملElementary Introduction to Pre-big Bang Cosmology and to the Relic Graviton Background
This is a contracted version of a series of lectures for graduate and undergraduate students given at the “VI Seminario Nazionale di Fisica Teorica” (Parma, September 1997), at the Second Int. Conference “Around VIRGO” (Pisa, September 1998), and at the Second SIGRAV School on “Gravitational Waves in Astrophysics, Cosmology and String Theory” (Center “A. Volta”, Como, April 1999). The aim is to...
متن کاملCosmic Gravitational Wave Background in String Cosmology
String cosmology models predict a stochastic cosmic background of gravitational waves with a characteristic spectrum. I describe the background, present astrophysical and cosmological bounds on it, and outline how it may be possible to detect it with gravitational wave detectors.
متن کاملProduction and Detection of Relic Dilatons in String Cosmology
This paper summarizes the contribution presented at the IX Marcel Grossmann Meeting (Rome, July 2000). It is stressed, in particular, that a non-relativistic background of ultra-light dilatons, produced in the context of string cosmology, could represent today a significant fraction of cold dark matter. If the dilaton mass lies within the resonant band of present gravitational antennas, a stoch...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1995