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SUMMARY:Sameer Murthy (Kings College London)
DTSTART;VALUE=DATE-TIME:20200526T120000Z
DTEND;VALUE=DATE-TIME:20200526T130000Z
DTSTAMP;VALUE=DATE-TIME:20200812T040818Z
UID:CERNStringSem/1
DESCRIPTION:Title: The growth of the 1/16-BPS index in N=4 Super Yang-Mill
s\nby Sameer Murthy (Kings College London) as part of CERN String Seminars
\n\n\nAbstract\nI will discuss the superconformal index that counts states
preserving two supercharges in N=4 SYM\, and more generally in N=1 SCFTs\
, on $S^3$. This index is captured by a unitary matrix model with purely d
ouble trace operators in the action. The AdS/CFT correspondence predicts t
hat the index should have exponential growth at large charges and large N\
, corresponding to the 1/16-BPS black hole (BH) in AdS5. I will present an
alytical and numerical analyses of the matrix model which clearly show thi
s expected BH growth. In particular\, I will introduce a deformation of th
e matrix model which allows us to solve it at large-N. The deformation has
interesting relations with the Bloch-Wigner dilogarithm\, a function intr
oduced by number theorists. \nFinally\, using techniques from representati
on theory\, I will show that the finite-N index actually interpolates betw
een counting multi-gravitons at small charge and BHs at large charge.\n
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BEGIN:VEVENT
SUMMARY:Michele Del Zotto
DTSTART;VALUE=DATE-TIME:20200616T120000Z
DTEND;VALUE=DATE-TIME:20200616T130000Z
DTSTAMP;VALUE=DATE-TIME:20200812T040818Z
UID:CERNStringSem/2
DESCRIPTION:Title: Higher form symmetries and M theory\nby Michele Del Zot
to as part of CERN String Seminars\n\n\nAbstract\nWhat is the stringy orig
in of discrete higher form symmetries of quantum field theories? In this t
alk we will discuss the answer to this question in terms of defect groups
from geometric engineering in M-theory. Flux non-commutativity in M-theory
gives rise to (mixed) ’t Hooft anomalies for the defect group\, which c
onstrains the corresponding global structures of the associated quantum fi
elds. Examples of applications in various dimensions will be given\, with
special emphasis on the case of 5d SCFTs.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Maloney
DTSTART;VALUE=DATE-TIME:20200623T140000Z
DTEND;VALUE=DATE-TIME:20200623T150000Z
DTSTAMP;VALUE=DATE-TIME:20200812T040818Z
UID:CERNStringSem/3
DESCRIPTION:Title: Gravity from Averaging CFTs\nby Alex Maloney as part of
CERN String Seminars\n\n\nAbstract\nI will explore the idea that certain
theories of gravity in Anti-de\nSitter space are dual to an average over a
n ensemble of quantum\ntheories\, rather than to a specific quantum theory
. I will describe\nan average over Narain’s family of two-dimensional c
onformal field\ntheories which describe free bosons on a torus\, and compu
te the\npartition function using the Siegel-Weil formula. The result take
s\nthe form of a sum over geometries as one would expect in a theory of\ng
ravity. But the gravitational theory looks more like a Chern-Simons\nthe
ory than like Einstein gravity.\n
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BEGIN:VEVENT
SUMMARY:David Andriot
DTSTART;VALUE=DATE-TIME:20200707T130000Z
DTEND;VALUE=DATE-TIME:20200707T140000Z
DTSTAMP;VALUE=DATE-TIME:20200812T040818Z
UID:CERNStringSem/4
DESCRIPTION:Title: Do classical de Sitter string backgrounds exist?\nby Da
vid Andriot as part of CERN String Seminars\n\n\nAbstract\nA classical sol
ution of string theory with a 4d de Sitter space-time could provide a simp
le and well-controlled setting to establish a connection to cosmological m
odels. So far however\, it has proven very difficult to find any example o
f such a solution. As will be recalled\, attempts in this direction are pl
agued by many no-go theorems\, or by the difficulty for concrete 10d super
gravity solutions to fit in the classical stringy regime. This situation a
grees with the recent claims of de Sitter swampland conjectures. These con
jectures can actually be verified quantitatively\, with a surprisingly goo
d agreement\, as will be shown. This may hint at a deep reason against cla
ssical de Sitter background\, possibly to be found within the web of swamp
land conjectures\, and the relation to the distance conjecture will briefl
y be commented on.\n
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BEGIN:VEVENT
SUMMARY:Julian Sonner
DTSTART;VALUE=DATE-TIME:20200811T120000Z
DTEND;VALUE=DATE-TIME:20200811T130000Z
DTSTAMP;VALUE=DATE-TIME:20200812T040818Z
UID:CERNStringSem/5
DESCRIPTION:Title: Causal symmetry breaking: late time physics of holograp
hic quantum chaos\nby Julian Sonner as part of CERN String Seminars\n\n\nA
bstract\nQuantum chaotic systems are often defined via the assertion that
their spectral statistics coincides with\, or is well approximated by\, ra
ndom matrix theory. In this talk I will explain how the universal content
of random matrix theory emerges as the consequence of a simple symmetry-br
eaking principle and its associated Goldstone modes. Within AdS/CFT this g
ives a universal framework to express correlations between ``different uni
verses’’\, even for individual theories rather than ensembles. I will
Illustrate the bulk picture of this EFT using the example minimal string t
heory. I will end by discussing the construction of the EFT of quantum cha
os also in higher dimensional field theories\, as applicable for example f
or higher-dimensional AdS/CFT dual pairs.\n
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