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SUMMARY:Thiago Fleury (Federal University of Rio Grande)
DTSTART:20210927T010000Z
DTEND:20210927T023000Z
DTSTAMP:20260423T041158Z
UID:ttbar2021/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/ttbar2021/3/
 ">On Factorizable S-matrices\, Generalized $T\\bar{T}$\, and the Hagedorn 
 Transition</a>\nby Thiago Fleury (Federal University of Rio Grande) as par
 t of Exact Results on Irrelevant Deformations of QFTs\n\n\nAbstract\nIn th
 is talk\, I will consider integrable quantum field theories deformed by so
 me kind of CDD factors. The models involve just one kind of stable particl
 e.  These deformations are related with the $T\\bar{T}$ and generalized $
 T\\bar{T}$ deformations.   These models have a factorizable $S$-matrices 
 and their ground state energies $E(R)$ with the spatial  coordinate compa
 ctified on a circle  of circumference R can be computed by the Thermodyna
 mic Bethe Ansatz (TBA) equations. I will show that the TBA equations for v
 arious models exhibit two real solutions (the primary and secondary branch
 es)  at $R$ greater than a certain critical parameter-dependent value $R^
 \\ast$ (a square-root branching point).  This behavior of $E(R)$ is quali
 tatively the same as the one for standard $T\\bar{T}$ deformations of  lo
 cal QFT. The singularity signals a Hagedorn behavior of the density of hig
 h energy states.  I will finish the talk mentioning several open question
 s.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/3/
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