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BEGIN:VEVENT
SUMMARY:Alessandro Sfondrini (Padova University)
DTSTART;VALUE=DATE-TIME:20210927T000000Z
DTEND;VALUE=DATE-TIME:20210927T010000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/1
DESCRIPTION:Title: Integrability\, $T\\bar{T}$ and AdS$_3$/CFT$_2$ correspondence\nby A
lessandro Sfondrini (Padova University) as part of Exact Results on Irrele
vant Deformations of QFTs\n\n\nAbstract\nIntegrability underlies the AdS$_
3$/CFT$_2$ correspondence in presence of Ramond-Ramond (RR) and Neveu-Schw
arz-Neveu-Schwarz (NSNS) fluxes. For the special case of backgrounds with
NSNS fluxes only\, the integrable structure simplifies drastically and app
ears to be closely related to a TTbar deformation of a free theory. I will
sketch how this integrability construction allows us to reproduce the Wes
s-Zumino-Witten spectrum exactly\, and how it may be generalised to correl
ation functions.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Tateo (Torino University)
DTSTART;VALUE=DATE-TIME:20210927T073000Z
DTEND;VALUE=DATE-TIME:20210927T083000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/2
DESCRIPTION:Title: Deforming the ODE/IM correspondence with $T\\bar{T}$\nby Roberto Tat
eo (Torino University) as part of Exact Results on Irrelevant Deformations
of QFTs\n\n\nAbstract\nThe ODE / IM correspondence is a remarkable link b
etween classical integrable models\, Bethe Ansatz and nonlinear integral e
quations for finite volume integrable Quantum Field Theories. Within the $
sin(h)$-Gordon framework\, I will show that the ODE/IM remains valid also
after classical/quantum TTbar deformation.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thiago Fleury (Federal University of Rio Grande)
DTSTART;VALUE=DATE-TIME:20210927T010000Z
DTEND;VALUE=DATE-TIME:20210927T023000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/3
DESCRIPTION:Title: On Factorizable S-matrices\, Generalized $T\\bar{T}$\, and the Hagedorn
Transition\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/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emil J Martinec (University of Chicago)
DTSTART;VALUE=DATE-TIME:20210928T000000Z
DTEND;VALUE=DATE-TIME:20210928T010000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/4
DESCRIPTION:Title: Stringy AdS$_3$/CFT$_2$\nby Emil J Martinec (University of Chicago)
as part of Exact Results on Irrelevant Deformations of QFTs\n\n\nAbstract\
nA class of noncritical AdS$_3$ backgrounds with NS fluxes have CFT duals
given by a deformed symmetric product\, whose properties can be derived by
a systematic investigation of the worldsheet description. The extension
of the CFT to a linear dilaton regime\, related to the TTbar deformation\,
is briefly described.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:George Jorjadze (Togliatti State University)
DTSTART;VALUE=DATE-TIME:20210928T073000Z
DTEND;VALUE=DATE-TIME:20210928T083000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/5
DESCRIPTION:Title: $T\\barT$ deformation of Witten's cigar model\nby George Jorjadze (T
ogliatti State University) as part of Exact Results on Irrelevant Deformat
ions of QFTs\n\n\nAbstract\nWe describe the symmetries of Witten’s cigar
\, emphasizing its similarity to Liouville theory. In particular\, we intr
oduce the $S$-matrix of the model as an operator with conformal and $W$-sy
mmetry. We then discuss the $T\\bar{T}$ deformation of these structures.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergey Frolov (Trinity College Dublin)
DTSTART;VALUE=DATE-TIME:20211001T083000Z
DTEND;VALUE=DATE-TIME:20211001T093000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/6
DESCRIPTION:Title: Comments on TTbar-deformed non-relativistic models\nby Sergey Frolov
(Trinity College Dublin) as part of Exact Results on Irrelevant Deformati
ons of QFTs\n\n\nAbstract\nWe comment on the similarities and differences
between $T\\bar{T}$-deformed relativistic and non-relativistic models\, an
d use one-soliton solutions of the deformed NLS and KdV models to discuss
the phenomenon of widening/narrowing width of particles under the $T\\bar{
T}$ deformation.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anna Spiering (Trinity College Dublin)
DTSTART;VALUE=DATE-TIME:20210929T083000Z
DTEND;VALUE=DATE-TIME:20210929T093000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/7
DESCRIPTION:Title: Integrability and chaos in sYM theories from the anomalous-dimenison spe
ctrum\nby Anna Spiering (Trinity College Dublin) as part of Exact Resu
lts on Irrelevant Deformations of QFTs\n\n\nAbstract\nThe discovery of int
egrability in planar $\\mathcal{N}=4$ sYM theory led to considerable advan
ces in the computation of planar anomalous dimensions. In this talk I will
discuss universal statistical properties of anomalous-dimension spectra i
n sYM theories in the planar limit and at finite rank of the gauge group.
I will show how they can give insight into the nature of the underlying mo
del\, in particular we will see integrability manifest itself in spectra o
f integrable spin chains\, while non-planar spectra\, as well as spectra o
f non-integrable spin chains\, can be described by random matrix theory.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorrit Kruthoff (Stanford University)
DTSTART;VALUE=DATE-TIME:20210930T000000Z
DTEND;VALUE=DATE-TIME:20210930T010000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/8
DESCRIPTION:by Jorrit Kruthoff (Stanford University) as part of Exact Resu
lts on Irrelevant Deformations of QFTs\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/ttbar2021/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kirill Semenov-Tian-Shansky (Kurchatov Institute)
DTSTART;VALUE=DATE-TIME:20210930T073000Z
DTEND;VALUE=DATE-TIME:20210930T083000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/9
DESCRIPTION:Title: Elliptic functions and exact summation of leading logs around $T\\bar{T}
$ deformation of $O(N+1)$-symmetric 2D QFTs\nby Kirill Semenov-Tian-Sh
ansky (Kurchatov Institute) as part of Exact Results on Irrelevant Deforma
tions of QFTs\n\n\nAbstract\nIn this talk we consider the most general (be
yond $T\\bar{T}$) deformation of the $2D$ $O(N+1)$ $\\sigma$-model by th
e irrelevant dimension-four operators. The theory deformed in this way i
s generally not integrable\, and its $S$-matrix loses the factorization pr
operties. We present an overview of the method of exact all-order summat
ion of leading infrared logarithms in $2D$ massless $\\phi^4$-type non-r
enormalizable effective field theories (EFTs). It is based on the fundam
ental requirements of unitarity\, analyticity and crossing symmetry of sca
ttering amplitudes and generalizes the renormalization group technique for
the case of non-renormalizable EFTs. This method allows us to provide
the exact results for the $2 \\to 2$ $S$-matrix in the leading logarithm
ic approximation in the deformed $2D$ $O(N+1)$ $\\sigma$-model. In parti
cular\, we present the remarkable solution expressed in terms of ellipti
c functions leading to scattering amplitudes with a doubly periodic struct
ure of the Landau poles. We discuss the new insights into the properties
of the theories deformed by irrelevant operators more general than the
$T\\bar{T}$ deformation from the perspective of our approach.TBA\n
LOCATION:https://researchseminars.org/talk/ttbar2021/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Junggi Yoon (APCTP)
DTSTART;VALUE=DATE-TIME:20210930T083000Z
DTEND;VALUE=DATE-TIME:20210930T093000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/10
DESCRIPTION:Title: $T\\bar{T}$-deformed Fermionics Theories Revisited\nby Junggi Yoon
(APCTP) as part of Exact Results on Irrelevant Deformations of QFTs\n\nAbs
tract: TBA\n
LOCATION:https://researchseminars.org/talk/ttbar2021/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergei Dubovsky (New York University)
DTSTART;VALUE=DATE-TIME:20211001T000000Z
DTEND;VALUE=DATE-TIME:20211001T010000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/11
DESCRIPTION:by Sergei Dubovsky (New York University) as part of Exact Resu
lts on Irrelevant Deformations of QFTs\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/ttbar2021/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andre LeClair (Cornell University)
DTSTART;VALUE=DATE-TIME:20211001T073000Z
DTEND;VALUE=DATE-TIME:20211001T083000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/12
DESCRIPTION:Title: $T \\Tbar$ deformation of the Ising model and its ultraviolet completio
n\nby Andre LeClair (Cornell University) as part of Exact Results on I
rrelevant Deformations of QFTs\n\n\nAbstract\nPure $T\\Tbar$ deformations
of conformal field theories are generally asymptotically incomplete in th
e ultra-violet (UV) due to square-root singularities in the ground state e
nergy on a cylinder of circumference $R$\, such that the theory is ill-def
ined for distances shorter than some critical \n$R_*$. In this article w
e show how a theory can be completed if one includes an infinite number o
f additional irrelevant perturbations. \nThis is fully demonstrated in
the case of the Ising model at $c_{IR}= 1/2$ in the infra-red (IR)\, whe
re we find two completions with central charges $c_{UV} = 3/2$ and $c_{UV}
= 7/10$\, the latter being the tri-critical Ising model. Both of these U
V completions have $\\CN=1$ supersymmetry which is broken in the renormal
ization group flow to low energies. We also consider multiple $T\\Tbar$
deformations of a free massless boson\, where we cannot find a UV comple
tion that is consistent with the c-theorem. For negative coupling $g$\,
which violates the c-theorem\, in both cases we find $c_{UV} = -c_{IR}$ a
s $g \\to -\\infty$. Finally we also study pure $T\\Tbar$ deformations of
the off-critical Ising model.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yunfeng Jiang (Southeast University)
DTSTART;VALUE=DATE-TIME:20210928T083000Z
DTEND;VALUE=DATE-TIME:20210928T093000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/13
DESCRIPTION:Title: Solvable irrelevant deformations with boundaries and defects\nby Yu
nfeng Jiang (Southeast University) as part of Exact Results on Irrelevant
Deformations of QFTs\n\n\nAbstract\nIn this talk\, I will present some new
results on the TTbar and more general solvable irrelevant deformations of
quantum field theories with integrable boundaries and defects. I will fir
st discuss the deformed boundary and defect scattering matrices and then c
onsider the deformation of other important physical quantities such as the
spectrum and the exact $g$-function.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alessandro Sfondrini\, Fernando Alday\, Lorenz Eberhardt\, Pedro V
ieira (Padua University\, SISSA\, IAS\, Perimeter Institute)
DTSTART;VALUE=DATE-TIME:20210927T110000Z
DTEND;VALUE=DATE-TIME:20210927T130000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/14
DESCRIPTION:Title: Panel Discussion on Exact Approaches to Non-planar Physics\nby Ales
sandro Sfondrini\, Fernando Alday\, Lorenz Eberhardt\, Pedro Vieira (Padua
University\, SISSA\, IAS\, Perimeter Institute) as part of Exact Results
on Irrelevant Deformations of QFTs\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/ttbar2021/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monica Guica (IPhT\, Saclay)
DTSTART;VALUE=DATE-TIME:20210927T083000Z
DTEND;VALUE=DATE-TIME:20210927T093000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/15
DESCRIPTION:Title: JTbar- deformed CFTs as non-local CFTs\nby Monica Guica (IPhT\, Sac
lay) as part of Exact Results on Irrelevant Deformations of QFTs\n\n\nAbst
ract\nVarious holographic set-ups in string theory suggest the existence o
f non-local\, UV complete two- dimensional QFTs that possess a Virasoro sy
mmetry\, in spite of their non- locality. I will argue that JTbar- deform
ed CFTs are the first concrete realisation of such a QFT\, through a deta
iled analysis of their classical and quantum symmetry algebra.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthias Staudacher (Humboldt University)
DTSTART;VALUE=DATE-TIME:20210929T073000Z
DTEND;VALUE=DATE-TIME:20210929T083000Z
DTSTAMP;VALUE=DATE-TIME:20240329T073608Z
UID:ttbar2021/16
DESCRIPTION:Title: A Deformed\, Integrable\, Non-Diagonalizable Spin Chain from QFT\nb
y Matthias Staudacher (Humboldt University) as part of Exact Results on Ir
relevant Deformations of QFTs\n\n\nAbstract\nI discuss the features of cer
tain integrable spin chains one obtains from the dilatation operator of st
rongly twisted\, double-scaled deformations of $\\mathcal{N} = 4$ Super Ya
ng-Mills Theory. A particular case is a certain chiral three-state model w
ith an exceedingly simple Hamiltonian. It is non-diagonalizable\, and show
s very rich and intricate patterns of Jordan cell formation. I explain som
e of the difficulties one faces when applying the quantum inverse scatteri
ng method to these models. I also sketch how to find a beautiful solution
to this problem. Finally\, I will briefly discuss some relations to logari
thmic four-dimensional quantum field theories and in particular the result
ing challenges for a complete understanding of fishnet-type models.\n
LOCATION:https://researchseminars.org/talk/ttbar2021/16/
END:VEVENT
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