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CATEGORIES:Theoretical Physics Colloquium
SUMMARY:Wilson Surface Central Charge from Holography - An
dy O'Bannon\, Southampton
DTSTART;TZID=Europe/London:20190213T141500
DTEND;TZID=Europe/London:20190213T151500
UID:TALK119134AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/119134
DESCRIPTION:M-theory is currently our best candidate for a the
ory of everything\, but remains mysterious. We kno
w M-theory has M2- and M5-branes. The low-energy t
heory on a stack of coincident M2-branes is well-u
nderstood: it is maximally supersymmetric Chern-Si
mons-matter theory. However\, the low-energy theor
y on a stack of coincident M5-branes remains poorl
y-understood: it is a maximally supersymmetric the
ory of self-dual strings with zero tension. In thi
s talk I will discuss one type of probe of the M5-
brane theory\, namely self-dual strings with infin
ite tension. These play a role analogous to Wilson
lines in gauge theories\, but are two-dimensional
surfaces rather than lines\, and hence are called
Wilson surfaces. I will describe holographic calc
ulations of entanglement entropy associated with W
ilson surfaces from which we extract a key paramet
er characterizing them\, namely their central char
ge. This provides a count of the number of massles
s degrees of freedom living on them\, and thus may
shed light on some of the fundamental degrees of
freedom of M-theory. Along the way I will summariz
e recent developments in studying two-dimensional
defects in conformal field theories more generally
.
LOCATION:MR2\, Centre for Mathematical Sciences
CONTACT:Francesca Chadha-Day
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