BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Radiation from Global Topological Strings using Adaptive Mesh Refi
 nement - Amelia Drew (University of Cambridge)
DTSTART:20190614T120000Z
DTEND:20190614T130000Z
UID:TALK123769@talks.cam.ac.uk
CONTACT:Nathan Johnson-McDaniel
DESCRIPTION:The detection of gravitational waves by LIGO has opened up a n
 ew window into observational cosmology. This has encouraged research into 
 gravitational wave signatures from other sources\, such as cosmic strings 
 and phase transitions in the early universe\, as well as alternative dark 
 matter candidates. In this talk\, we present numerical investigations of g
 lobal topological strings and their radiation pathways\, which can be appl
 ied either to cosmic or dark matter axion strings. There has been debate i
 n the literature over the dominant mechanisms for this radiation and the r
 esulting spectrum\, in part due to the approximations used\, either ideali
 sed as one-dimensional Nambu-Goto strings or with the limited dynamic rang
 e of field theory simulations.   We demonstrate how the application of the
  numerical technique of adaptive mesh refinement\, using the public code G
 RChombo\, yields new insights into string radiation and backreaction and m
 ay resolve this controversy.    The direct analogy between massless Goldst
 one boson (or axion) radiation and gravitational radiation means that thes
 e methods should also enable accurate prediction of gravitational wave sig
 natures.
LOCATION:Pavilion B Potter Room (B1.19)
END:VEVENT
END:VCALENDAR