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SUMMARY:The Gravitational Wave Background as a Particle Detector
DTSTART:20260604T130000Z
DTEND:20260604T140000Z
DTSTAMP:20260609T133700Z
UID:indico-event-1561@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Angus Spalding\n\nI will show that spectral features
  of a gravitational-wave background can directly determine the Lagrangian 
 parameters of BSM particles\, independently of the gravitational-wave prod
 uction mechanism. Long-lived particles generically induce a temporary peri
 od of early matter domination in the thermal history of the Universe\, imp
 rinting two characteristic frequencies in any primordial gravitational-wav
 e background corresponding to the onset and end of this epoch. These frequ
 encies are determined by the initial abundance\, mass\, and decay rate of 
 the dominating species. Once the underlying model is specified\, the obser
 ved spectral features directly determine the particle mass and decay rate\
 , allowing gravitational-wave observations to probe the Lagrangian paramet
 ers of particle physics models. I will illustrate this framework for sever
 al well-motivated BSM particles\, including right-handed neutrinos\, gravi
 tinos\, moduli fields\, and axion-like particles.\n\nhttps://conference.ip
 pp.dur.ac.uk/event/1561/
URL:https://conference.ippp.dur.ac.uk/event/1561/
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