BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Alessandro Sfondrini (Padova University)
DTSTART:20210927T000000Z
DTEND:20210927T010000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/1
DESCRIPTION:Title: Integrability\, $T\\bar{T}$ and AdS$_3$/CFT$_2$ correspondence\nby Alessandro Sfondrini (Padova University) as part of Exact Results on
Irrelevant Deformations of QFTs\n\n\nAbstract\nIntegrability underlies th
e AdS$_3$/CFT$_2$ correspondence in presence of Ramond-Ramond (RR) and Nev
eu-Schwarz-Neveu-Schwarz (NSNS) fluxes. For the special case of background
s with NSNS fluxes only\, the integrable structure simplifies drastically
and appears to be closely related to a TTbar deformation of a free theory.
I will sketch how this integrability construction allows us to reproduce
the Wess-Zumino-Witten spectrum exactly\, and how it may be generalised to
correlation functions.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Tateo (Torino University)
DTSTART:20210927T073000Z
DTEND:20210927T083000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/2
DESCRIPTION:Title: Deforming the ODE/IM correspondence with $T\\bar{T}$\nby Robe
rto Tateo (Torino University) as part of Exact Results on Irrelevant Defor
mations of QFTs\n\n\nAbstract\nThe ODE / IM correspondence is a remarkable
link between classical integrable models\, Bethe Ansatz and nonlinear int
egral equations for finite volume integrable Quantum Field Theories. Withi
n the $sin(h)$-Gordon framework\, I will show that the ODE/IM remains val
id also after classical/quantum TTbar deformation.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thiago Fleury (Federal University of Rio Grande)
DTSTART:20210927T010000Z
DTEND:20210927T023000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/3
DESCRIPTION:Title: On Factorizable S-matrices\, Generalized $T\\bar{T}$\, and the Ha
gedorn Transition\nby Thiago Fleury (Federal University of Rio Grande)
as part of Exact Results on Irrelevant Deformations of QFTs\n\n\nAbstract
\nIn this talk\, I will consider integrable quantum field theories deforme
d by some kind of CDD factors. The models involve just one kind of stable
particle. These deformations are related with the $T\\bar{T}$ and genera
lized $T\\bar{T}$ deformations. These models have a factorizable $S$-ma
trices and their ground state energies $E(R)$ with the spatial coordinat
e compactified on a circle of circumference R can be computed by the The
rmodynamic Bethe Ansatz (TBA) equations. I will show that the TBA equation
s for various models exhibit two real solutions (the primary and secondary
branches) at $R$ greater than a certain critical parameter-dependent va
lue $R^\\ast$ (a square-root branching point). This behavior of $E(R)$ i
s qualitatively the same as the one for standard $T\\bar{T}$ deformations
of local QFT. The singularity signals a Hagedorn behavior of the density
of high energy states. I will finish the talk mentioning several open q
uestions.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emil J Martinec (University of Chicago)
DTSTART:20210928T000000Z
DTEND:20210928T010000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/4
DESCRIPTION:Title: Stringy AdS$_3$/CFT$_2$\nby Emil J Martinec (University of Ch
icago) as part of Exact Results on Irrelevant Deformations of QFTs\n\n\nAb
stract\nA class of noncritical AdS$_3$ backgrounds with NS fluxes have CFT
duals given by a deformed symmetric product\, whose properties can be der
ived by a systematic investigation of the worldsheet description. The ext
ension of the CFT to a linear dilaton regime\, related to the TTbar deform
ation\, is briefly described.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:George Jorjadze (Togliatti State University)
DTSTART:20210928T073000Z
DTEND:20210928T083000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/5
DESCRIPTION:Title: $T\\barT$ deformation of Witten's cigar model\nby George Jorj
adze (Togliatti State University) as part of Exact Results on Irrelevant D
eformations of QFTs\n\n\nAbstract\nWe describe the symmetries of Witten’
s cigar\, emphasizing its similarity to Liouville theory. In particular\,
we introduce the $S$-matrix of the model as an operator with conformal and
$W$-symmetry. We then discuss the $T\\bar{T}$ deformation of these struct
ures.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergey Frolov (Trinity College Dublin)
DTSTART:20211001T083000Z
DTEND:20211001T093000Z
DTSTAMP:20260404T094339Z
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 De
formations of QFTs\n\n\nAbstract\nWe comment on the similarities and diffe
rences between $T\\bar{T}$-deformed relativistic and non-relativistic mode
ls\, and use one-soliton solutions of the deformed NLS and KdV models to d
iscuss the phenomenon of widening/narrowing width of particles under the $
T\\bar{T}$ deformation.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anna Spiering (Trinity College Dublin)
DTSTART:20210929T083000Z
DTEND:20210929T093000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/7
DESCRIPTION:Title: Integrability and chaos in sYM theories from the anomalous-dimeni
son spectrum\nby Anna Spiering (Trinity College Dublin) as part of Exa
ct Results on Irrelevant Deformations of QFTs\n\n\nAbstract\nThe discovery
of integrability in planar $\\mathcal{N}=4$ sYM theory led to considerabl
e advances in the computation of planar anomalous dimensions. In this talk
I will discuss universal statistical properties of anomalous-dimension sp
ectra in 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 underl
ying model\, in particular we will see integrability manifest itself in sp
ectra of integrable spin chains\, while non-planar spectra\, as well as sp
ectra of non-integrable spin chains\, can be described by random matrix th
eory.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorrit Kruthoff (Stanford University)
DTSTART:20210930T000000Z
DTEND:20210930T010000Z
DTSTAMP:20260404T094339Z
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://stable.researchseminars.org/talk/ttbar2021/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kirill Semenov-Tian-Shansky (Kurchatov Institute)
DTSTART:20210930T073000Z
DTEND:20210930T083000Z
DTSTAMP:20260404T094339Z
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-Shansky (Kurchatov Institute) as part of Exact Results on Irrelevant
Deformations of QFTs\n\n\nAbstract\nIn this talk we consider the most gene
ral (beyond $T\\bar{T}$) deformation of the $2D$ $O(N+1)$ $\\sigma$-mode
l by the irrelevant dimension-four operators. The theory deformed in thi
s way is generally not integrable\, and its $S$-matrix loses the factoriza
tion properties. We present an overview of the method of exact all-order
summation of leading infrared logarithms in $2D$ massless $\\phi^4$-typ
e non-renormalizable effective field theories (EFTs). It is based on the
fundamental requirements of unitarity\, analyticity and crossing symmetry
of scattering amplitudes and generalizes the renormalization group techni
que for the case of non-renormalizable EFTs. This method allows us to p
rovide the exact results for the $2 \\to 2$ $S$-matrix in the leading lo
garithmic approximation in the deformed $2D$ $O(N+1)$ $\\sigma$-model. I
n particular\, we present the remarkable solution expressed in terms of
elliptic functions leading to scattering amplitudes with a doubly periodic
structure of the Landau poles. We discuss the new insights into the pro
perties 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://stable.researchseminars.org/talk/ttbar2021/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Junggi Yoon (APCTP)
DTSTART:20210930T083000Z
DTEND:20210930T093000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/10
DESCRIPTION:Title: $T\\bar{T}$-deformed Fermionics Theories Revisited\nby Jungg
i Yoon (APCTP) as part of Exact Results on Irrelevant Deformations of QFTs
\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergei Dubovsky (New York University)
DTSTART:20211001T000000Z
DTEND:20211001T010000Z
DTSTAMP:20260404T094339Z
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://stable.researchseminars.org/talk/ttbar2021/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andre LeClair (Cornell University)
DTSTART:20211001T073000Z
DTEND:20211001T083000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/12
DESCRIPTION:Title: $T \\Tbar$ deformation of the Ising model and its ultraviolet co
mpletion\nby Andre LeClair (Cornell University) as part of Exact Resul
ts on Irrelevant Deformations of QFTs\n\n\nAbstract\nPure $T\\Tbar$ deform
ations of conformal field theories are generally asymptotically incomplet
e in the ultra-violet (UV) due to square-root singularities in the ground
state energy on a cylinder of circumference $R$\, such that the theory is
ill-defined for distances shorter than some critical \n$R_*$. In this ar
ticle we show how a theory can be completed if one includes an infinite n
umber of additional irrelevant perturbations. \nThis is fully demonstr
ated in the case of the Ising model at $c_{IR}= 1/2$ in the infra-red (IR)
\, where 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 UV completions have $\\CN=1$ supersymmetry which is broken in the r
enormalization group flow to low energies. We also consider multiple $T
\\Tbar$ deformations of a free massless boson\, where we cannot find a UV
completion that is consistent with the c-theorem. For negative coupling
$g$\, which violates the c-theorem\, in both cases we find $c_{UV} = -c_
{IR}$ as $g \\to -\\infty$. Finally we also study pure $T\\Tbar$ deformati
ons of the off-critical Ising model.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yunfeng Jiang (Southeast University)
DTSTART:20210928T083000Z
DTEND:20210928T093000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/13
DESCRIPTION:Title: Solvable irrelevant deformations with boundaries and defects
\nby Yunfeng Jiang (Southeast University) as part of Exact Results on Irre
levant Deformations of QFTs\n\n\nAbstract\nIn this talk\, I will present s
ome new results on the TTbar and more general solvable irrelevant deformat
ions of quantum field theories with integrable boundaries and defects. I w
ill first discuss the deformed boundary and defect scattering matrices and
then consider the deformation of other important physical quantities such
as the spectrum and the exact $g$-function.\n
LOCATION:https://stable.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:20210927T110000Z
DTEND:20210927T130000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/14
DESCRIPTION:Title: Panel Discussion on Exact Approaches to Non-planar Physics\n
by Alessandro Sfondrini\, Fernando Alday\, Lorenz Eberhardt\, Pedro Vieira
(Padua University\, SISSA\, IAS\, Perimeter Institute) as part of Exact R
esults on Irrelevant Deformations of QFTs\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monica Guica (IPhT\, Saclay)
DTSTART:20210927T083000Z
DTEND:20210927T093000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/15
DESCRIPTION:Title: JTbar- deformed CFTs as non-local CFTs\nby Monica Guica (IPh
T\, Saclay) as part of Exact Results on Irrelevant Deformations of QFTs\n\
n\nAbstract\nVarious holographic set-ups in string theory suggest the exis
tence of non-local\, UV complete two- dimensional QFTs that possess a Vira
soro symmetry\, in spite of their non- locality. I will argue that JTbar-
deformed CFTs are the first concrete realisation of such a QFT\, through
a detailed analysis of their classical and quantum symmetry algebra.\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthias Staudacher (Humboldt University)
DTSTART:20210929T073000Z
DTEND:20210929T083000Z
DTSTAMP:20260404T094339Z
UID:ttbar2021/16
DESCRIPTION:Title: A Deformed\, Integrable\, Non-Diagonalizable Spin Chain from QFT
\nby Matthias Staudacher (Humboldt University) as part of Exact Result
s on Irrelevant Deformations of QFTs\n\n\nAbstract\nI discuss the features
of certain integrable spin chains one obtains from the dilatation operato
r of strongly twisted\, double-scaled deformations of $\\mathcal{N} = 4$ S
uper Yang-Mills Theory. A particular case is a certain chiral three-state
model with an exceedingly simple Hamiltonian. It is non-diagonalizable\, a
nd shows very rich and intricate patterns of Jordan cell formation. I expl
ain some of the difficulties one faces when applying the quantum inverse s
cattering method to these models. I also sketch how to find a beautiful so
lution to this problem. Finally\, I will briefly discuss some relations to
logarithmic four-dimensional quantum field theories and in particular the
resulting challenges for a complete understanding of fishnet-type models.
\n
LOCATION:https://stable.researchseminars.org/talk/ttbar2021/16/
END:VEVENT
END:VCALENDAR