Gravitational Radiation from String Cosmology

TL;DR

This paper predicts a high-frequency gravitational wave spectrum from string cosmology models, estimating detection prospects with upcoming gravitational-wave detectors.

Contribution

It introduces a specific spectrum of relic gravitational radiation from string theory models and assesses their detectability with future detectors.

Findings

Spectrum is strongly tilted towards high frequencies.

Detection is feasible within certain parameter ranges.

Some planned detectors can potentially observe this gravitational radiation.

Abstract

A spectrum of relic stochastic gravitational radiation, strongly tilted towards high frequencies, and characterized by two basic parameters is shown to emerge in a class of string theory models. 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 plannedgravitational-wave detectors.