Peak and end point of the relic graviton background in string cosmology

TL;DR

This paper determines the possible frequency range and energy density of relic gravitational waves in string cosmology, providing estimates for experimental detection sensitivity in the Hz to GHz range.

Contribution

It identifies the allowed parameter space for the relic graviton background in string cosmology and estimates the minimal sensitivity needed for detection.

Findings

Allowed frequency and energy density range for relic gravitons

Estimated experimental sensitivity in Hz to GHz range

Constraints on string cosmology models

Abstract

Using general arguments we determine the allowed region for the end point frequency and the peak energy density of the stochastic background of gravity waves expected in string cosmology. We provide an accurate estimate of the minimal experimental sensitivity required to detect a signal in the Hz to GHz range.