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TUHIN MALIK (CFisUC - University of Coimbra)26/07/2023, 14:00Talk
The behavior of the nuclear equation of state (EOS), which plays a crucial role in describing the properties of neutron stars (NSs), is extensively investigated using a Bayesian approach applied to various classes of relativistic mean field models. These models encompass density-dependent meson couplings (DDH), interactions with non-linear characteristics, and the Chiral Mean Field (CMF)...
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Dr Ishfaq Ahmad Rather (Centro de Astrofisica e Gravitacao-CENTRA, Instituto Superior Tecnico-IST, Universidade de Lisboa-UL, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)26/07/2023, 14:25Talk
Employing the density-dependent relativistic mean-field model, we investigate the effect of delta baryons on the radial oscillations of neutron and hyperon stars. A unified approach is employed to calculate the baryon-meson coupling constants for the spin-1/2 baryonic octet and the spin-3/2 decuplet. By solving the Sturm-Liouville boundary value problem and verifying its validity, we calculate...
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Kauan Marquez (Universidade de Coimbra)26/07/2023, 14:50Talk
By applying a relativistic mean-field description of neutron star matter with density dependent couplings, we analyse the properties of nucleonic matter with delta baryons and nucleonic matter with hyperons and delta baryons. We calculate the baryon-meson coupling constants for the spin-1/2 baryonic octet and spin-3/2 decuplet in a unified approach relying on symmetry arguments such as the...
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Prasanta Char26/07/2023, 15:45Talk
Astrophysical observations of neutron stars allow us to study the physics of matter at extreme conditions which are beyond the scope of any terrestrial experiments. In this work, we perform a Bayesian analysis putting together the available knowledge from the nuclear physics experiments, observations of different X-ray sources, and gravitational wave events to constrain the equation of state...
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Dr Violetta Sagun (University of Coimbra)26/07/2023, 16:10Talk
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...
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Lingxiao Wang (Frankfurt Institute for Advanced Studies (FIAS))26/07/2023, 16:35Talk
We present a novel deep learning approach to optimize the equation of state (EoS) for probing neutron star observables. By leveraging an automatic differentiation framework, our method solves inverse problems and achieves accurate EoS optimization. Through training a neural network on a comprehensive dataset, we develop a predictive EoS model that yields precise relationships between pressure,...
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Ariel Zhitnitsky27/07/2023, 16:00Talk
We discuss the dynamics of the topologically nontrivial sectors with non-trivial holonomy in strongly coupled QCD in the background of the expanding universe characterized by the Hubble scale $H\ll \Lambda_{QCD}$. We argue that the vacuum energy and the de Sitter phase emerge dynamically with the scale $\rho_{DE}\approx H\Lambda_{QCD}^3 \approx (10^{-3} eV)^4$, which is amazingly...
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Prof. Seyong Kim (Sejong University)27/07/2023, 16:25Talk
Recently, a question about how far chemical freeze-out of heavy Dark
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Matter (DM) particles can be pushed down in temperature has been
raised. In this case, kinetic equilibration of heavy DM through
elastic collisions with strongly interacting Standard Model particles
such as quarks and gluons at the temperature of a few GeV could
potentially complicate the consideration. Thus, we study... -
Dr Feliciano De Soto (Universidad Pablo de Olavide)27/07/2023, 17:15Talk
We present an extensive study of the three-gluon vertex in Landau-gauge using quenched lattice-QCD calculations. The main goal of this work is exploring the features of the vertex beyond the well-known symmetric and soft-gluon kinematical configurations, and extend the results for those two kinematics to the general case of three different momenta $q$, $r$ and $p$ are only restricted by the...
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Yui Hayashi (YITP, Kyoto University)27/07/2023, 17:40Talk
In gauge theories with fundamental matters, the Higgs and confining regimes are believed to be smoothly connected. This Higgs-confinement continuity forms the foundation of the quark-hadron continuity conjecture, which is a crossover scenario from the nuclear superfluidity phase to the color superconducting phase in dense QCD. Certain superfluid gauge theories, including dense QCD, exhibit...
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Etsuko Itou28/07/2023, 14:00Talk
We obtain the equation of state (EoS) for two-color QCD at low temperature and high density from the lattice Monte Carlo simulation. Two-color QCD is a good toy model of real three-color QCD. The advantage to study this model is that the sign problem is absent even in finite density regime because of the pseudo-reality of quark field. We find that the speed of sound exceeds the relativistic...
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Andrey Kotov28/07/2023, 14:25Talk
We discuss the properties of Quantum Chromodynamics at finite temperature obtained by means of lattice simulations with the overlap fermion discretization. This fermion discretization preserves chiral symmetry even at finite lattice spacing. We present the details of the formulation and discuss the properties of the chiral thermal phase transition. We compare the results obtained with the...
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Kotaro Murakami28/07/2023, 14:50Talk
We discuss hadron scatterings in zero temperature and small chemical potential ($\mu$). First, we derive the dispersion relation of a single hadron from the Euclidean-time dependence of the 2-point correlation function. It is found that the energy has linear behavior with respect to $\mu$. We then formulate the HAL QCD method in small $\mu$, where we extract scattering amplitudes via the...
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Bastian Brandt (University of Bielefeld)28/07/2023, 15:15Talk
I will summarize the effort of our group to explore new phenomena showing up in external electromagnetic fields in full QCD on the lattice. In particular, I will discuss our effort of studying anomalous transport phenomena such as the chiral separation effect (CSE) as well as the modification of the topological susceptibility in external electromagnetic fields. The latter can be used to...
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