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Sergei Rutkevich (Retired from Bergische Universität Wuppertal)02/09/2025, 11:50Poster
The double sine-Gordon model is the non-integrable deformation of the standard sine-Gordon model caused by the cosine perturbation with the frequency reduced by the factor of 2. It was showed by Delfino and Mussardo [1], that this perturbation induces confinement of the sine-Gordon solitons, which become coupled into the ‘me- son’ bound states. I calculate [2] the meson masses in the weak...
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Francesco Mangialardi (DESY)02/09/2025, 11:55Poster
I will describe how correlation functions of a conformal field theory placed on the thermal geometry $S^1 \times S^2$ can be used to obtain precise information about flat space CFT data, namely the spectrum and the OPE coefficients of primary operators. The focus will be primarily on thermal one-point functions. Although exact formulas for thermal one-point blocks are not known in this...
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Tommaso Morone (Università di Torino)02/09/2025, 12:00Poster
Integrable quantum field theories with $\mathbb{Z}_n$ symmetry arise from decomposing two-body scattering amplitudes into cyclically shifted components, leading to graded S-matrices that organize asymptotic states into internal $\mathbb{Z}_n$ sectors. This framework preserves a generalized notion of braiding unitarity and crossing symmetry, and features an infinite tower of conserved charges...
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Alex Simon (ENS Lyon)02/09/2025, 12:05Poster
The S-matrix bootstrap program offers a unique possibility to compute explicitly the form factors of local operators in integrable quantum field theories. We shall build on those results so as to compute, in terms of explicit series of multiple integrals, the multipoint correlation functions in the Sinh-Gordon 1+1 dimensional quantum field theory, which is a simple case where the S-matrix is...
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David Gyorgy Szasz-Schagrin (Dipartimento di Fisica e Astronomia, Universit`a di Bologna and INFN, Sezione di Bologna)02/09/2025, 12:20Poster
The models known as "free fermions in disguise" are a class of Hamiltonians with very peculiar properties: while they are directly solvable by any Jordan-Wigner (JW) transformation, they display a free-fermionic spectrum. Indeed, the mapping to free fermionic modes involves a complicated non-linear and highly non-local map. Because of this, contrary to standard JW-solvable spin chains, it is a...
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Amir Nesturov (University of Ljubljana)02/09/2025, 12:25Poster
The 1+1-dimensional sinh-Gordon model is a well-known example of a simple and well-studied integrable QFT with factorized scattering. We consider this theory on a multi-sheeted Riemann surface with a flat metric and branch points, which are represented by twist operators $\cal T_n$. Twist operators are interesting in the context of von Neumann and Renyi entanglement entropies in the original...
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Konstantinos Chalas (Istituto Nazionale di Fisica Nucleare)02/09/2025, 12:30Poster
The linear growth of entanglement after a quench from a state with short-range correlations is a universal feature of many body dynamics.
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It has been shown to occur in integrable and chaotic systems undergoing either Hamiltonian, Floquet or circuit dynamics and has also been observed in experiments.
The entanglement dynamics emerging from long-range correlated states is far less studied,... -
Miklós Tóth02/09/2025, 12:35Poster
The sine-Gordon theory is a paradigmatic integrable field theory, relevant for the description of many 1D gapped systems. Despite its integrability, calculating finite temperature physical quantities, such as correlation functions, remains a challenge. We generalize the numerical method of random surfaces to compute the free energy, and finite temperature one- and two-point correlation...
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Csilla Király (HUN-REN Wigner Reserch Centre of Physics)04/09/2025, 11:30Poster
The Blume–Capel model, a spin chain system exhibiting a tricritical point described by a conformal field theory with central charge $c=7/10$, serves as a rich framework for studying its thermal perturbation, the $E_7$ integrable quantum field theory. In my work, I investigate both numerical and analytical aspects of the $E_7$ model, aiming to validate theoretical predictions and explore new...
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Mikhail Minin (Bergische Universität Wuppertal)04/09/2025, 11:35Poster
The study of correlation functions of integrable models at their free fermion points often leads to representations in terms of Fredholm determinants (and their minors) of integrable integral operators. This occurs, for example, in dynamical two-point correlation functions of the impenetrable Bose gas, the XY and XX spin chains at finite temperature. In this talk, we address the problem of...
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István Csépányi04/09/2025, 11:40Poster
I present recent progress in computing finite-temperature dynamical correlation functions in the 1+1 dimensional Ising field theory, an integrable quantum field theory. Leveraging the fact that in the Ising model, the finite-temperature form factor expansion can be recast as a Fredholm determinant, I develop a numerical approach based on evaluating these determinants. This representation is...
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Ali Zahra04/09/2025, 11:45Poster
We study the \emph{symmetric Dyson exclusion process} (SDEP)---a lattice gas with exclusion and long-range, Coulomb–type interactions that emerge both as the maximal-activity limit of the symmetric exclusion process and as a discrete version of Dyson's Brownian motion on the unitary group. Exploiting an exact ground-state (Doob) transform, we map the stochastic generator of the SDEP onto the...
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Gilles Parez (LAPTh, Université Savoie Mont Blanc, FR)04/09/2025, 12:00Poster
Quantum fidelities—like entanglement measures—originated in quantum information theory but have since become powerful probes of emergent phenomena in quantum many-body systems. In out-of-equilibrium settings, the most prominent example is the Loschmidt echo (LE), which quantifies the fidelity between an initial state and its time-evolved counterpart after a quantum quench. The LE is notably...
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Dusan Dordevic (Faculty of Physics, University of Belgrade)04/09/2025, 12:05Poster
As a contribution to understanding quantum spacetimes, we consider the quantum field theory of a massive scalar field on the Fuzzy AdS spacetime in two and three dimensions. We focus on boundary correlation functions, which, in the case of the commutative AdS bulk, are given by CFT correlators. In two dimensions, the fuzzy two-point function is calculated analytically and expressed in terms of...
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Fabio SailisPoster
I will introduce a method to compute the minimal form factors of diagonal integrable field theories perturbed by generalized $T \bar{T}$-perturbations that is going to appear in the next few months in a new paper with O. Castro-Alvaredo and S. Negro. Building on our previous results, these MFFs are constructed in such a way as to not allow for any free parameters, an issue that plagued...
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Dr Pramod Padmanabhan (Indian Institute of Technology Bhubaneswar)Poster
We show that the one dimensional, critical transverse field Ising model is Yang-Baxter integrable. This is done by constructing commuting transfer matrices built out of a $R$-matrix satisfying the Yang-Baxter equation with additive spectral parameters. The $R$-matrix is non-local, as it is expressed in terms of Majorana fermions. It is also non-regular. Nevertheless, we show that the quantum...
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Adolfo Holguin (Trinity College Dublin)Poster
Three point-correlation functions of half-BPS operators in 𝒩=4 SYM are deceivingly complex observables. Non-renormalization theorems tell us that they can be exactly computed at the free point of the theory making them a perfect target for understanding non-perturbative gravitational effects in the large N expansion in regimes where the planar expansion is inadequate.
I will review...
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Riccardo Travaglino (Istituto Nazionale di Fisica Nucleare)Poster
The quasiparticle picture provides simplest and yet most effective way to study the out-of-equilibrium evolution of entanglement measures following a quantum quench at the ballistic scale. It has found applications in the study of R´enyi entropies and negativities in free and interacting systems. I will present a novel point of view for this rather dated subject, according to which the...
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