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SUMMARY:Metastable Cosmic String Networks and how to break them
DTSTART:20261022T130000Z
DTEND:20261022T140000Z
DTSTAMP:20261013T010000Z
UID:indico-event-1584@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Lorenzo Tranchedone (U. Oxford)\n\nCosmic string net
 works constitute an important potential signature of new physics. For both
  theoretical and phenomenological reasons\, it can be interesting to consi
 der networks that are metastable instead of absolutely stable\, such that 
 the strings decay away at some point in cosmic history. The metastability 
 of these networks is known to result in a characteristic cutoff in the sto
 chastic gravitational wave signal they produce. I will first review the us
 ual setup in which the network is destroyed via quantum tunnelling\, and t
 hen discuss how in generic models the network is expected to break at much
  earlier times\, either via finite-temperature effects or by attaching to 
 pre-existing monopoles during network percolation. This “early-time” b
 reaking significantly modifies the parameter space for which such a networ
 k can act as a source for the NANOgrav signal. I will also revisit quantum
 -tunnelling induced breaking\; numerical simulations suggest that this occ
 urs mainly at rare high tension points on the strings\, yielding a larger 
 rate than usually assumed.\n\nhttps://conference.ippp.dur.ac.uk/event/1584
 /
URL:https://conference.ippp.dur.ac.uk/event/1584/
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