BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Fengwei Yang\, "Stability of Superconducting Strings"
DTSTART:20261027T010000Z
DTEND:20261027T140000Z
DTSTAMP:20261101T002600Z
UID:indico-event-274@indico.zdv.uni-mainz.de
DESCRIPTION:The cosmic string can be superconducting\, with fermionic or b
 osonic charged carriers propagating along the string. Fermionic supercondu
 cting strings emerge by introducing fermions that couple to the complex sc
 alar field that constitutes the string. The fermion zero modes are bounded
  to the string as required by the index theorem. The Fermi pressure provid
 ed by fermion zero modes counterbalances the string weight\, giving a stab
 le string loop configuration\, known as a vorton. The stability of vorton 
 remains an open question. For example\, the loop shrinkage may overshoot z
 ero modes\, the maximal Fermi energy of zero modes may not be large enough
  to avoid zero modes energetically jumping off of the string\, the calcula
 tions of zero-mode decay rate are not consistent in the literature\, and s
 o on. In this talk\, I will address these stability problems. Since the vo
 rton stability depends on string dynamics (including string loop contracti
 on and radiation)\, zero-mode decay\, quantum tunneling\, and scattering p
 rocesses\, I will tackle these problems at both classical and quantum leve
 ls. Our results show that the vorton can be cosmologically stable and thus
  it is intriguing to consider vorton dark matter.\n\nhttps://indico.zdv.un
 i-mainz.de/event/274/
LOCATION:R. 05-127 (Lorentz-Room)
URL:https://indico.zdv.uni-mainz.de/event/274/
END:VEVENT
END:VCALENDAR