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SUMMARY:Cosmic String Radiation: the Importance of Curvature - Amelia Drew
 \, DAMTP\, University of Cambridge
DTSTART:20240607T120000Z
DTEND:20240607T130000Z
UID:TALK216808@talks.cam.ac.uk
CONTACT:Xi Tong
DESCRIPTION:Cosmic strings are topological defects that arise in particle 
 physics models with a spontaneously broken U(1) symmetry\, motivated\, for
  example\, by the Peccei-Quinn mechanism. They are predicted to radiate ma
 ssive particles\, gravitational waves and\, in the case of a global U(1) s
 ymmetry breaking\, massless dark matter axions. In order to detect cosmic 
 strings via gravitational waves or to understand their axion emission spec
 tra\, we need to model the radiation dependence on certain string paramete
 rs. In this talk\, I will detail my work modelling the dependence of axion
  string scalar radiation on the curvature of the string relative to the st
 ring width. I will focus on my most recent paper\, arXiv:2312.07701 (to ap
 pear in PRD)\, which uses adaptive mesh refinement simulations of collidin
 g travelling waves along the string to measure the dependence of massive a
 nd massless modes on the string curvature. I will comment on the potential
  implications of this work for gravitational wave predictions from cosmic 
 strings. If time allows\, I will also outline some work in progress on mod
 elling the massive radiation from Nambu-Goto-like cusps using simulations 
 of Abelian-Higgs strings\, and how this will be extended using full numeri
 cal relativity.
LOCATION:Potter room/Zoom
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