HET Seminar | Philip Saad, Member, School of Natural Sciences, IAS | "Wormholes without averaging" | via Zoom

Apr 19, 2021, 2:30 pm2:30 pm
via Zoom
Event Description

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Meeting ID: 985 9550 4817

Abstract: After averaging over fermion couplings, SYK has a collective field description that sometimes has “wormhole” solutions. We study the fate of these wormholes when the couplings are fixed. Working 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 decoupled systems with fixed couplings, but they vanish after averaging, leaving the non-factorizing wormhole behind.