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SUMMARY:Philip Saad (IAS)
DTSTART:20210419T183000Z
DTEND:20210419T193000Z
DTSTAMP:20260423T023042Z
UID:PUHET/22
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/PUHET/22/">W
 ormholes without averaging</a>\nby Philip Saad (IAS) as part of Princeton 
 HET seminar\n\n\nAbstract\nAfter averaging over fermion couplings\, SYK ha
 s a collective field description that sometimes has “wormhole” solutio
 ns. We study the fate of these wormholes when the couplings are fixed. Wor
 king mainly in a simple model\, we find that the wormhole saddles persist\
 , but that new saddles also appear elsewhere in the integration space – 
 “half-wormholes.” The wormhole contributions depend only weakly on the
  specific choice of couplings\, while the half-wormhole contributions are 
 strongly sensitive. The half-wormholes are crucial for factorization of de
 coupled systems with fixed couplings\, but they vanish after averaging\, l
 eaving the non-factorizing wormhole behind.\n
LOCATION:https://researchseminars.org/talk/PUHET/22/
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