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SUMMARY:Metastable defects and gravitational waves
DTSTART:20260415T123000Z
DTEND:20260415T133000Z
DTSTAMP:20260509T054600Z
UID:indico-event-49594@agenda.infn.it
DESCRIPTION:Speakers: Alberto Mariotti (VUB)\n\nI will introduce basics as
 pects of cosmic defects\, how they arise in cosmological phase transitions
 \, and their implications for cosmology and gravitational waves.\nI will t
 hen revisit the case of metastable defects\, both in axion models and in t
 heories with symmetry-breaking patterns analogous to the electroweak secto
 r of the Standard Model. Next\, I will focus on metastable strings arising
  in a concrete dark sector model\, which have recently been considered as 
 candidates for explaining the gravitational-wave background observed by pu
 lsar timing arrays (PTA). I will discuss how they can decay quantum mechan
 ically\, and I will then present an analysis of their classical stability\
 , where I will show that classical instabilities can affect the parameter 
 space relevant for explaining the PTA signal. I will conclude by outlining
  future directions in the study of metastable defects.\n\nhttps://agenda.i
 nfn.it/event/49594/
LOCATION:CHANGE OF LOCATION: Arcetri\, Room B
URL:https://agenda.infn.it/event/49594/
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