Conveners
Session 3
- Michele Pepe (Istituto Nazionale di Fisica Nucleare)
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...
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...
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,...
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...
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...
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...
