The XXIX International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2022)

Cosmic Strings, Inflation and Gravitational Waves

Not scheduled

20m

Conference Centre “Karolos Papoulias” (University of Ioannina (GR))

Particle cosmology: Theory and Experiment

Speaker

RINKU MAJI (Physical Research Laboratory Ahmedabad)

Description

We investigate the impact of Coleman-Weinberg inflation on the stochastic gravitational wave background spectrum emitted by intermediate-scale cosmic strings. The string network is partially inflated and reenters the horizon at later times after the end of inflation, such that the short string loops are not produced. This leads to a significant modification of the gravitational wave spectrum that we explore in detail. We find that Coleman-Weinberg inflation can help to satisfy the Parkes Pulsar Timing Array (PPTA) bound for dimensionless string tension values in the range $G\mu > 1.1\times 10^{-10}$. We also identify the modified gravitational wave spectra which, in the case of inflation, are compatible with the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) data.