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SUMMARY:Finite Entanglement Entropy in String Theory - Atish Dabholkar (Ab
 dus Salam International Centre for Theoretical Physics)
DTSTART:20231201T100000Z
DTEND:20231201T110000Z
UID:TALK206488@talks.cam.ac.uk
DESCRIPTION:I discuss physical motivations from black hole physics and hol
 ographyfor expecting finite quantum entanglement entropy in quantum gravit
 y. I describe recent and earlier results in defining such a notion in pert
 urbative string theory by a stringy analog of the replica method using orb
 ifolds constructed for any odd positive integer N. The entropy so defined 
 naturally&nbsp\;includes a classical piece and is manifestly UV finitebut 
 has potential tachyonic IR divergences. I show that for several string com
 pactifications\, the specific structure of the tachyonic spectrum allows f
 or a re-summation and analytic&nbsp\;continuation to the physical region w
 here the IR divergences are absent and the resulting entropy is finite to 
 one-loop order.
LOCATION:Seminar Room 1\, Newton Institute
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