Vedran Brdar: Has NANOGrav found first evidence for cosmic strings?

Datum objave: 29. 10. 2020
Skupni FMF-IJS seminar visokoenergijske fizike
Četrtek, 29. oktober, ob 15:15,

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has recently reported strong evidence for a stochastic common-spectrum process affecting the pulsar timing residuals in its 12.5-year data set. We demonstrate that this process admits an interpretation in terms of a stochastic gravitational-wave background emitted by a cosmic-string network in the early Universe. We study local Nambu-Goto strings in dependence of their tension Gμ and loop size α and show that the entire viable parameter space will be probed by an array of future experiments.