SM&FT 2022 - The XIX Workshop on Statistical Mechanics and nonpertubative Field Theory

Session

Session 3

19 Dec 2022, 15:00

aula A ("Beppe Nardulli") (Dipartimento di Fisica - Università di Bari "Aldo Moro")

Conveners

Session 3

• Michele Pepe (Istituto Nazionale di Fisica Nucleare)

65. Elementary particle mass generation without Higgs

Prof. Giancarlo Rossi (University of Roma Tor Vergata, INFN Roma2 and Centro Fermi)

19/12/2022, 15:00

We discuss how a recently discovered non-perturbative field-theoretical mechanism giving mass to elementary fermions can be extended to generate a mass for the electro-weak bosons, when weak interactions are introduced, and can thus be used as a viable alternative to the Higgs scenario. We will show that this new scheme, tested in extensive lattice simulations, offers a solution of the mass...

69. Finite temperature BKT phase transition in the planar psi^4 model with a strongly modulating potential

Domenico Giuliano (Istituto Nazionale di Fisica Nucleare)

19/12/2022, 15:25

We employ analytical as well as numerical Monte Carlo methods to
discuss the BKT phase transition in the finite-temperature psi^4 model over a square lattice in the presence of a strong modulation of the chemical potential. By going through a systematic mapping over the anisotropic planar XY model with modulated spin interaction strengths, we show that the strength of the modulation only...

74. On the origin of the correspondence between quantum integrable system and classical models

Marco Rossi (Istituto Nazionale di Fisica Nucleare)

19/12/2022, 15:45

I will discuss a non-perturbative procedure on how to derive a classical systems, in the form of a Lax pair, from a quantum integrable model. I will exemplify the method by starting from the quantum sine-Gordon model and deriving a Lax pair containing the solution of the classical sinh-Gordon equation. The link between quantum and classical theory is provided by a Marchenko-like equation,...

77. Lattice Gauge Theories at finite density with Tensor Networks

Giuseppe Magnifico (Istituto Nazionale di Fisica Nucleare)

19/12/2022, 16:05

Gauge theories are of paramount importance in our understanding of fundamental constituents of matter and their interactions, ranging from high-energy particle physics to low-temperature quantum many-body physics. However, the complete characterization of their phase diagrams and the full understanding of non-perturbative effects are still debated, especially at finite charge density, mostly...

113. Quantum Computing Algorithms for Thermal Averages Estimation: an Analysis of Sources of Systematical Error

Giuseppe Clemente (DESY - Zeuthen)

19/12/2022, 16:25

In this talk we first present an overview of quantum computing algorithms for estimating the average of observables in a thermal ensamble, focussing in particular on two: the Quantum Metropolis Sampling algorithm and the Quantum-Quantum Metropolis Algorithm. We then analyze the effects systematical errors in the results for both algorithms under quantum noiseless conditions and using a...

124. A quantum optimization algorithm for deriving e ective shell model Hamiltonians

Giovanni De Gregorio (Istituto Nazionale di Fisica Nucleare)

19/12/2022, 16:45

In the recent years, theoretical methods for calculating the two body matrix elements of shell-model e ective Hamiltonians starting from realistic interactions have evolved considerably. However, these methods, usually rooted in the framework of many-body perturbation theory, present several sources of inaccuracies: 1) the convergence of the perturbation expansion; 2) the oscillator basis used...