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SUMMARY:Andrea Puhm: A rough end for smooth microstate geometries
DTSTART;VALUE=DATE-TIME:20170516T080000Z
DTEND;VALUE=DATE-TIME:20170516T090000Z
DTSTAMP;VALUE=DATE-TIME:20211207T143200Z
UID:indico-contribution-7209@indico.nbi.ku.dk
DESCRIPTION:The study of supersymmetric black holes in string theory has b
een a useful arena for the search for the correct microscopic description
of black holes\, with one of its greatest triumphs being the explicit stri
ngy counting by Strominger and Vafa of the number of microstates of the D1
-D5-P system. The fuzzball program is an attempt to describe these microst
ates at finite coupling with the extended objects of string theory modifyi
ng the structure of the black hole horizon by replacing it with an end to
spacetime. An important open question is what fraction of these microstate
s is smooth\, contains singularities corresponding to D-brane sources or i
s arbitrarily quantum and/or strongly curved. Recently Eperon\, Reall\, an
d Santos identified a non-linear classical instability in these geometries
due to the growth of excitations at an “evanescent ergosurface” of in
finite redshift whose implications for the fuzzball program depend crucial
ly on its endpoint. In this talk I will argue that the instability drives
rare smooth microstates with large angular momentum to more typical micros
tates with smaller angular momentum and terminates when the density of mic
rostates is maximal. At this point\, the large stringy corrections to such
microstates may render them non-linearly stable just as supergravity brea
ks down: a rough end for smooth microstate geometries. I will discuss a po
ssible mechanism for this stabilization detailed in an illustrative toy mo
del.\nhttps://indico.nbi.ku.dk/event/979/contributions/7209/
LOCATION:Auditorium A (Niels Bohr Institute)
RELATED-TO:indico-event-979@indico.nbi.ku.dk
URL:https://indico.nbi.ku.dk/event/979/contributions/7209/
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