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Prof. Ioseph Buchbinder (Laboratory of Theoretical Physics, Joint Institute for Nuclear Research)30/07/2026, 14:30New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
New method is proposed for the quantization of generic reducible gauge theories with linearly dependent generators where the standard quantization ansatz is not applicable since the corresponding De Witt-Faddeev-Popov determinant is degenerate. The method consists in nested factorizations of the gauge group volume for the determination of the correctly defined delta function of reduced gauge...
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Johannes Henn30/07/2026, 14:45New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
Precise predictions for cross-sections at present and future particle colliders require reliable methods for evaluating multi-loop Feynman integrals, which are often beyond the reach of direct analytic techniques. In this talk, I will present new numerical approaches that exploit general structural properties of quantum field theory—such as positivity and analyticity—to compute Feynman...
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Prof. Jorge Alfaro (Pontificia Universidad Católica de Chile)30/07/2026, 15:00New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
Algebraic non-covariant gauges are used often in string theory, Chern-Simons theory, gravitation and gauge theories. Loop integrals, however, have spurious singularities that need to be regularized. The most popular and consistent regularization is the Mandelstam- Leibbrandt(ML) prescription. In this work we extends the ML prescription outside the light cone. It shares all the properties of...
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Prof. Nikolaos Kidonakis30/07/2026, 15:15New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
I present new results for the massive cusp anomalous dimension at four loops in QCD. I combine partial exact and conjectured analytical expressions with an approximation that is based on the asymptotic behavior of the cusp anomalous dimension to produce the newest estimate. Detailed comparisons are made with previous approximate results that highlight the robustness of the calculational approach.
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Andrea Guerrieri30/07/2026, 15:30New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
In recent years, the non-perturbative S-matrix Bootstrap has emerged as a powerful framework to constrain quantum field theories directly from general principles such as unitarity, analyticity, and crossing symmetry.
In this talk, I will review recent results of this program across different energy scales, including the bootstrap prediction of a previously missing tetraquark state in QCD...
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Prof. Denis Karateev (Universite de Geneve (CH))30/07/2026, 15:45New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
We study the scattering of scalar and fermion particles in four-dimensional quantum field theories, with and without global symmetries. We construct non-perturbative bounds on this process using the S-matrix bootstrap. In the presence of SO(3) symmetry, we interpret our results as bounds on observables in pion–nucleon scattering. In particular, we derive bounds on the residues of poles...
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Ronaldo Thibes (Universidade Estadual do Sudoeste da Bahia)30/07/2026, 16:00New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
We investigate the FLPR model in a recently proposed framework of BRST-related symmetries and perform its full functional quantization as a gauge invariant system taking into account the Gribov ambiguities and produce a consistent generating functional which can be used as a starting point for the Gribov-Zwanziger-Sorella program. We obtain a family of BRST-related transformations generated by...
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Andreas Athenodorou30/07/2026, 16:45New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
We report recent results from an extensive study of the flux-tube spectrum and its implications for the existence of an axion on the worldsheet of the confining string. We focus on both closed and open flux tubes in four-dimensional $SU(N_c)$ gauge theories. For closed flux tubes, employing the thermodynamic Bethe ansatz with controlled approximations, we find that a large subset of the...
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Prof. Alexander Belyaev (University of Southampton & Rutherford Appleton Laboratory)30/07/2026, 17:00New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
We present a novel tabletop approach to testing fundamental gravitational physics using quantum phononic excitations in a trapped Bose-Einstein condensate (BEC). The setup exploits the unique sensitivity of a BEC to the two leading contributions to the gravitational potential in $\Lambda$-gravity, namely the Newtonian $GM/r$ term and the cosmological constant contribution $\Lambda r^2$, which...
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Wolfgang Bietenholz30/07/2026, 17:15New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
It is an unnatural feature of the Standard Model that the
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difference between the baryon number B and the lepton number L
is conserved, which implies an exact, global symmetry.
We turn it into a naturally exact, local symmetry by coupling
the quantum number B-L to an Abelian gauge field.
Gauge anomalies are cancelled by adding right-handed neutrinos
nu_R, which are not sterile.
This... -
Sebastian Mendizabal30/07/2026, 17:30New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
We investigate the role of a chemical potential in the propagators of a scalar field theory driven out of equilibrium. Our analysis is based on the Schwinger–Keldysh–Kadanoff–Baym formalism, focusing on the coupled dynamics of the spectral function and the statistical propagator. Solutions are obtained in the presence of a thermal reservoir in which scalar particles are produced. We find that...
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Pouya Asadi30/07/2026, 17:45New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
We use a variational method to calculate the spectrum and the parton distribution function of ground-state hadrons of various gauge theories in 1+1 dimensions. The template functions in our method minimize a free-energy functional defined as a combination of free-valence partons’ kinetic energy on the light cone and the Renyi entanglement entropy of biparton subsystems. Our results show that...
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Nikita Tsegelnik (BLTP, JINR)30/07/2026, 18:00New Developments in Quantum Field Theory, String Theory and Quantum Information in HEPTalk
We analyze the dynamics of a static open string in a general stationary spacetime, which can represent a heavy quark-antiquark pair within the holographic framework or effective theory. We establish that for a simple U-shaped string with only radial dependence on the space string coordinate, the string profile is generally not symmetric about its turning point, and the symmetry restores only...
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