B-mode polarization induced by gravitational waves from kinks on infinite cosmic strings

TL;DR

This paper analyzes how gravitational waves from kinks on infinite cosmic strings influence the B-mode polarization of the CMB, highlighting their significance for future detection if cosmic string tension is sufficiently high.

Contribution

It provides a detailed calculation of the GW background from kinks on infinite cosmic strings and assesses its impact on the CMB B-mode polarization spectrum.

Findings

B-mode polarization from kinks is comparable to that from string network motion.

GWs from kinks significantly affect the B-mode spectrum.

Detection is possible if cosmic string tension exceeds ~10^{-8} Gμ.

Abstract

We investigate the effect of the stochastic gravitational wave (GW) background produced by kinks on infinite cosmic strings, whose spectrum was derived in our previous work, on the B-mode power spectrum of the cosmic microwave background (CMB) anisotropy. We find that the B-mode polarization due to kinks is comparable to that induced by the motion of the string network and hence the contribution of GWs from kinks is important for estimating the B-mode power spectrum originating from cosmic strings. If the tension of cosmic strings \mu is large enough i.e., G\mu >~ 10^{-8}, B-mode polarization induced by cosmic strings can be detected by future CMB experiments.