The optimal approach of detecting stochastic gravitational wave from string cosmology using multiple detectors

TL;DR

This paper investigates optimal detection strategies for stochastic gravitational waves from string cosmology using multiple ground-based interferometers, demonstrating that combining pairs of detectors enhances detection performance over direct output combination.

Contribution

It introduces a comparative analysis of detection approaches for string cosmology gravitational waves, highlighting the superiority of combining multiple detector pairs.

Findings

Combining detector pairs improves detection probability.

Optimal parameter ranges identified for string cosmology signals.

Method reduces false alarms compared to direct output combination.

Abstract

String cosmology models predict a relic background of gravitational wave produced during the dilaton-driven inflation. It's spectrum is most likely to be detected by ground gravitational wave laser interferometers (IFOs), like LIGO, Virgo, GEO, as the energy density grows rapidly with frequency. We show the certain ranges of the parameters that underlying string cosmology model using two approaches, associated with 5% false alarm and 95% detection rate. The result presents that the approach of combining multiple pairs of IFOs is better than the approach of directly combining the outputs of multiple IFOs for LIGOH, LIGOL, Virgo and GEO.