We investigate mergers of neutron stars consisting of two non-interacting fluids minimally coupled to the gravitational field using the numerical relativity code BAM. The first fluid represents baryonic matter, whereas the second fluid models dark matter, which we describe using the equation of state of a degenerate Fermi gas. We consider two different scenarios for the distribution of the...
The cooling of neutron stars has proven to be a fantastic way of probing the interior of these objects. Many works were dedicated to investigating several aspects of this rich and complicated phenomena. Our current understanding of the thermal evolution of these objects tells us that they cool down mainly due to two mechanisms: neutrino emission from their interior, and photon emission from...
The improvement of experimental results as led to the need of equally precise, and practical, theoretical approaches to the Standard Model. The Implicit Regularisation (IReg) framework sets itself apart of more conventional dimensional schemes as it works purely in the physical 4 dimensions, which eases some problems of the aforementioned, like the need for evanescent fields. In this work we...
We compute the power spectrum of super-horizon curvature perturbations generated during a late period of thermal inflation, taking into account fluctuation-dissipation effects resulting from the scalar flaton field's interactions with the ambient radiation bath. We find that, at the onset of thermal inflation, the flaton field may reach an equilibrium with the radiation bath even for...
The physics governing the production of the early emission of gamma‑ray bursts (GRBs) is still poorly understood. The early emission is usually caught by a wide field of view gamma‑ray instruments in the range of 10 keV-10 MeV, but to date, at higher energies (above 100 GeV) it has not been detected yet. I will discuss the multi-messenger observational strategies to detect the early emission...
The main goal of this research is to obtain a clear and accurate model of the late-time behavior of a quantum-corrected black hole’s radiative emission wave. Specifically, the focus is on late-time tail waveforms, which appear after the exponentially damped signal originating from the ring down phase of a perturbed black hole. This project focused on interpreting the effects of loop quantum...
The usual inflationary paradigm places the reheating period strictly after the slow-roll regime of the inflaton field comes to an end. We develop and analyse a novel mechanism that allows for production of scalar particles during the slow-roll regime due to a narrow parametric resonance found in the equations of motion. It is shown that an appreciable number of particles can be produced...
Compact stars are the most exotic and dense laboratories in the Universe to test the properties of strongly interacting matter. Understanding the complex phenomena observed in neutron and hybrid stars requires profound knowledge in a wide range of scientific disciplines. In addition to the experimental data on nuclear and hadron matter, the realistic equation of state (EoS) should be...
Once further confirmed in future analyses, the radius and mass measurement of HESS J1731-347 with $M=0.77^{+0.20}_{-0.17}~M_{\odot}$ and $R=10.4^{+0.86}_{-0.78}~\rm km$ will be among the lightest and smallest compact object ever detected. This raises a lot of questions about its nature and opens up the window for different theories to explain the measurements. We use the latest data on the...
This presentation will provide an overview of two research papers. The first paper focuses on the calculation of baryon-meson coupling constants for spin-1/2 baryonic octet and spin-3/2 decuplet using symmetry arguments based on SU(3) and SU(6) group transformations. The coupling constants are determined by reproducing known potential depths for hyperons and Δ resonances. These constants are...
Ariel and Umbriel have almost certainly passed through the 5:3 mean motion resonance in the past, owing to the tidal evolution of their orbits. However, the exact mechanism that allows the system to evade capture in this resonance is a great puzzle. For coplanar orbits (zero inclinations), the eccentricity of at least one satellite must be close to 0.01 at the time, which is unlikely because...
We propose a three-flavor version of the Polyakov-Nambu-Jona-Lasino (PNJL) model at zero temperature regime, by implementing a traced Polyakov loop (Φ) dependence in the scalar, vector and ’t Hooft channel strengths. We study the thermodynamics of this model, named as PNJL0, with special attention for the first-order confinement/deconfinement phase transition for which Φ is the order...
