Topological Defects in Beyond the Standard Models, Gravitational Waves and Pulsar Timing Data

by Dr Rinku Maji (IBS)

Thursday 19 Jun 2025, 16:00 → 17:30 Asia/Seoul

Room 1423 (KIAS)

Title: Topological Defects in Beyond the Standard Models, Gravitational Waves and Pulsar Timing Data

Speaker: Rinku Maji (IBS CTPU)

Abstract: I will discuss the formation of string and its various composite structures in SO(10) GUTs. We discuss the stochastic gravitational wave background emitted from a network of 'quasi-stable' strings (QSS) and 'walls bounded by strings' (WBS). The gravitational waves emitted from QSS and WBS with dimensionless string tension $G\mu\sim 10^{-6}$ can explain the evidence of the stochastic gravitational wave background in the recent NANOGrav and other pulsar timing array data.
In the next part, I will talk  about the complementary signatures of a detectable high frequency gravitational wave background from "walls bounded by strings" together with an observable flux of GUT monopoles as a distinct observable signature of an SO(10) GUT broken via a C-parity (sometimes called as D-parity) conserving left-right symmetric intermediate gauge symmetry.