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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-7923
DTSTART:20220927T210000Z
DTEND:20220927T220000Z
DTSTAMP:20230322T005840Z
LAST-MODIFIED:20220920T143717Z
LOCATION:Chamberlin 5280
SUMMARY:Coupling a Cosmic String to a TQFT\, Theory Seminar (High Ener
gy/Cosmology)\, Sungwoo Hong\, (Argonne\, U. Chicago)
DESCRIPTION:In the last few years\, the notion of symmetry has been en
larged to "generalized symmetry" and these more generalized symmetries
have played a critical role in deepening our understanding of QFT\, n
otably IR phases of QFT. In this talk\, I will discuss various ways of
coupling the axion-Maxwell theory to a sector of topological field th
eory (TQFT). Contrary to common wisdom\, I will show that such topolog
ical modifications can lead to direct changes in the local physics wit
h possible observable consequences. This surprise can be realized by a
dimensional reduction\, namely\, a coupling to a TQFT in 4d leads to
a non-trivial and local impact on the 2d string world-sheet QFT. I wil
l explain how this happens using the language of anomaly inflow\, whic
h provides a way of figuring out the IR-universal observable effect fr
om the TQFT-coupling. There exists another topological modification of
the theory\, i.e. gauging a discrete subgroup of 0-form shift symmetr
y\, and this time it results in an alteration of the spectrum of cosmi
c strings. If time permits\, I will also discuss generalized symmetrie
s and associated higher-groups of these theories.
URL:https://www.physics.wisc.edu/events/?id=7923
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