High Energy Theory Lunchtime Seminar

Week of Monday, September 17th 2018


Friday, September 21st 2018
No seminar this week.

Vainshteinfest: Insights info Quantum Field Theory

1:00 - 1:45 pm
"Monopoles versus the instanton-dyons"
Edward Shuryak
State University of New York, Stony Brook

1:45 - 2:30 pm
"Generalized state sums and quantum distillations"
Mithat Ünsal
North Carolina State University

2:30 - 3:00 pm
Coffee break

3:00 - 3:45 pm
"Comments on the Theta term in Yang-Mills theory"
Zohar Komargodski
Weizmann Institute of Science

3:45 - 4:30 pm
"The Arkady mechanism"
Cédric Deffayet
Institut d'astrophysique de Paris

ABSTRACTS:
"Monopoles versus the instanton-dyons"
Edward Shuryak
State University of New York, Stony Brook

Abstract: Magnetic monopoles explained confinement and flux tubes, unusual kinetics of quark-gluon plasma, and, recently, even observed properties of jet quenching. But in QCD-like theories there is no classical solutions of this kind. Instantons and their constituents, the instant-dyons, lead to systematic semiclassical theory, which recently explained deconfinement and Chiral phase transitions in a variety of settings. The talk will briefly review that, and focus on the nature of the so called Poisson duality, confirming that these two languages are dual to each other, and lead to the same partition function. At the end we show what does it tell us about QCD monopoles.

"Generalized state sums and quantum distillations"
Mithat Ünsal
North Carolina State University

Abstract: I describe a generalization of the notion of partition function in general quantum field theories. The thermal partition function is a state sum over the Hilbert space, which typically has non-analyticities, and can be used to study phase transitions, and thermodynamics. I will describe graded states sums which may be controllably tuned to be analytic. As such, they can be used to interpolate between weak and strong coupling regime of QFTs. I will show that this notion is useful to understand general non-perturbative aspects of quantum field theory, providing examples from 2d QFTs, and 4d QCD.

"Comments on the Theta term in Yang-Mills theory"
Zohar Komargodski
Weizmann Institute of Science

"The Arkady mechanism"
Cédric Deffayet
Institut d'astrophysique de Paris

Abstract: I will review the "Vainshtein mechanism", first formulated in
the context of massive gravity by Arkady in 1972 and now routinely used in
various theories beyond General Relativity.

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