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SUMMARY:From Little Strings to M5-branes and Number Theory via a Quasi-Top
ological Sigma Model on Loop Group
DTSTART;VALUE=DATE-TIME:20210604T013000Z
DTEND;VALUE=DATE-TIME:20210604T024500Z
DTSTAMP;VALUE=DATE-TIME:20230323T180035Z
UID:indico-contribution-5736@indico.ipmu.jp
DESCRIPTION:Speakers: Meng-Chwan Tan (NUS Singapore)\nWe unravel the groun
d states and left-excited states of the A_{k-1} N=(2\,0) little string the
ory. Via a theorem by Atiyah\, these sectors can be captured by a supersym
metric quasi-topological sigma model on CP^1 with target space the based l
oop group of SU(k). The ground states\, described by L^2-cohomology classe
s\, form modules over an affine Lie algebra\, while the left-excited state
s\, described by chiral differential operators\, form modules over a toroi
dal Lie algebra. We also apply our results to unravel the 1/2 and 1/4 BPS
sectors of the M5-brane worldvolume theory\, which spectrum we find to be
captured by cousins of modular and automorphic forms\, respectively\, that
reveal an intrinsic S- and T-duality of the worldvolume theory.\n\nhttps:
//indico.ipmu.jp/event/387/contributions/5736/
LOCATION:Online
URL:https://indico.ipmu.jp/event/387/contributions/5736/
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