Jun 3 – 7, 2024
Europe/Zurich timezone
There is a live webcast for this event.

Quantum Entanglement Entropy in String Theory

Jun 7, 2024, 2:45 PM
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium


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Atish Dabholkar (ICTP)


I discuss physical motivations from black hole physics and holography for expecting finite quantum entanglement entropy in quantum gravity. I describe recent and earlier results in defining such a notion in perturbative string theory by a stringy analog of the replica method using ZN orbifolds constructed for any odd positive integer N. The entropy so defined naturally includes a classical piece and is manifestly UV finite but has potential tachyonic IR divergences. I show that for several string compactifications as well as on black hole horizons in AdS3/CFT2 holography, the specific structure of the tachyonic spectrum allows for a re-summation and analytic continuation to the physical region 0 < N ≤ 1 where the IR divergences are absent and the resulting entropy is finite to one-loop order.

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