Bari Theory Xmas Workshop 2024

Contribution List

4. Axions from Neutron stars mergers: production and detection signatures

Francesca Lecce (Università degli studi di Bari)

17/12/2024, 09:30

Session 1

In this work, the flux of axions produced during the merger of two neutron stars has been studied. To compute the flux, the most recent neutron star merger models have been employed. Subsequently, the flux of observable gamma rays resulting from the conversion of these axions in the Galactic magnetic field have been estimated.

5. Asymptotics of open quantum systems: a (quite) gentle introduction

Daniele Amato (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 09:50

Session 1

In this talk we will discuss some basic notions about
the dynamics of open quantum systems, with a particular focus on
the asymptotic evolution of the system.
After recalling the dynamics of closed quantum systems, we will review
how the states and the evolution are described in the open-system scenario.
Moreover, the definition of the asymptotic subspace will be introduced...

6. Two-states Ornstein-Uhlenbeck particle in a trapping potential

Daniela Moretti (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 10:10

Session 1

In recent years, much attention has been paid to the observation of non-Gaussian probability density functions for diffusing systems in a variety of experiments and theoretical models, as such property could entail new physical insight. In this work, we solved analytically the Langevin equation of motion in the overdamped regime of a particle moving both in absence and in presence of a...

15. Lepton masses and mixing from S3 modular symmetry - an mcmc analysis

Francesco Marcone

17/12/2024, 10:30

Session 1

This work presents a detailed analysis of the origin of lepton masses and mixing angles within the framework of S3 modular symmetry.
The main goal is to achieve a consistent theoretical framework for the hierarchy of lepton masses and mixing angles, leveraging the symmetry properties of the modular group.
The model analysis is carried out using the Markov Chain Monte Carlo method to improve...

7. Robustness of quantum symmetries against perturbations

Vito Giuseppe Viesti (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 11:20

Session 2

A privileged role in the description of a quantum system is played by symmetries, which are operators that remain constant in time (in the Heisenberg picture). It is well known that these are represented by operators that commute with the Hamiltonian of the system.
Quantum symmetries can be further classified based on their stability with respect to perturbations of the Hamiltonian. There are...

8. The Hawking-Unruh Effect

Riccardo Acquaviva (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 11:40

Session 2

The Unruh effect is a quantum field prediction according to which a uniformly accelerated observer in the vacuum detects thermal particles with a temperature directly proportional to its acceleration. In other words, an accelerating thermometer in empty space will record a non-zero temperature.
This phenomenon is closely related to the Hawking effect, which describes the theoretical thermal...

14. Probing the structure of  chi_c1(3872): heavy quark symmetries at work

Giuseppe Roselli (Università degli studi di bari)

17/12/2024, 12:00

Session 2

Since 2003, a number of hadronic states have been observed with properties that challenge their classification as predicted by the quark model. Many of these states have a charm-anticharm component in their quark content and are therefore referred to as charmonium-like states.
The first of these states,  chi_c1(3872), was observed in 2003 by the Belle collaboration. This observation has been...

13. Work Fluctuations, Singular Distributions and Big Jumps for a Harmonically Confined Active Particle

Massimiliano Semeraro (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 12:20

Session 2

Within the framework of Large Deviation Theory, Large Deviation Functions (LDFs) describe the asymptotics of probability distribution of time-integrated observables and assign fluctuations of any intensity a probability value, thus outperforming the central limit theorem. LDFs hold significant physical importance in the context of statistical mechanics as they provide extensions of the concept...

11. Heavy meson decays as precision tools for new physics: A search for beyond Standard Model signals

Nicola Losacco (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 14:00

Session 3

During the years several tensions were found between experimental results and Standard Model (SM) predictions, in particular in the flavour sector. Individually, these anomalies are not large enough to disproof SM but all together they are telling us that a theory beyond it is required. In particular, measurements of semileptonic $B$ decays are pointing out a violation of the lepton flavour...

10. Simulation of quantum algorithms and quantum many-body systems

Rosa Lucia Capurso (Università degli Studi di Bari)

17/12/2024, 14:20

Session 3

The inadequacy of conventional computers in simulating the behavior of many-body quantum systems, due to their limited computational resources, has led to the development of quantum computers, based upon the intrinsic properties of quantum systems themselves. While an ordinary computer operates on classical bits, a quantum computer is built upon qubits, which are two-level quantum systems that...

9. Primordial Graviton Production and Detection Prospects in the Pre-Big Bang Scenario

Eliseo Pavone (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 14:40

Session 3

I will discuss the interpretation of the NANOGrav signal as a relic stochastic background of primordial gravitons, potentially produced within the framework of string cosmology's pre-big bang scenario. We demonstrate that this interpretation encounters limitations within a minimal version of the scenario; however, it becomes feasible when considering generalized, non-minimal extensions, even...

2. Security of Quantum Key Distribution

Gabriele Staffieri (Università degli studi di Bari "Aldo Moro")

17/12/2024, 15:00

Session 3

The security of classical cryptosystems is based on the assumption about the impossibility of solving certain mathematical problems, like the factorization of large numbers. Unfortunately the advent of quantum computers represents a serious problematic owing their exponentially higher computational power; this problem is known as “quantum threat”. However quantum mechanics can be as well...

12. High frequency gravitational waves shining in photons in Galactic magnetic fields

Alessandro Lella (Istituto Nazionale di Fisica Nucleare)

17/12/2024, 15:50

Session 4

High-frequency gravitational waves ($f\gtrsim$ MHz) are a smoking gun for the existence of exotic physics. Indeed, GW backgrounds generated in the early Universe could be characterized by high-frequency signals, allowing one to probe inflation, first-order phase transitions, topological defects and primordial black holes. The lack of current and future gravitational waves experiments...

16. Coexistence of Defect Morphologies in Three-Dimensional Active Nematics

Pasquale Digregorio (Università degli Studi di Bari)

17/12/2024, 16:10

Session 4

Within a living cell, motor proteins like kinesin are responsible of the transport of intracellular components. The functioning of this active transport is well known, and it has been employed to build synthetic assemblies of microtubules, which are stirred at the level of the single components and evolve out of thermal equilibrium. Such system is a paradigmatic example of an active material,...

19. Dynamical cluster-based optimization of tensor network algorithms for simulating quantum circuits with finite fidelity

Andrea De Girolamo

17/12/2024, 16:30

Session 4

3. Multipartite Entanglement and Quantum Frustration

Paolo Scarafile (Napoli)

17/12/2024, 16:50

Session 4

Frustration is a phenomenon commonly encountered in various domains, from social and psychological contexts to the realm of physics. In particular, the concept of frustration has a significant role in quantum systems, where it describes situations in which the individual components of a system cannot achieve a globally optimal state due to conflicting interactions. This presentation will delve...

18. TBA