HIPSTARS 2022 - Workshop on Heavy Ion Physics and Compact Stars

Session

Contribution talks

24 Oct 2022, 10:30

11. Deciphering flow at SIS energies: A look through the keyhole

Tom Reichert

24/10/2022, 10:30

Talk

The elliptic flow of hadrons at SIS energies is negative due to immense shadowing from the spectators shielding the collision zone. In this talk it is discussed how this measured negative elliptic flow is created through the decoupling dynamics. In contrast to the final state observed flow, the flow of the whole system during the time evolution is found to be positive due to the early pressure...

17. Correcting the $B_A$​ coalescence factor at GSI-HADES and RHIC-BES energies

Mr Apiwit Kittiratpattana (Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany)

24/10/2022, 10:55

Talk

We investigate the coalescence factors $B_2$ and $B_3$ at low collision energies ($\sqrt{s_\mathrm{NN}}<6$ GeV) with special focus on the HADES and RHIC-BES experiments. It is shown that, in order to properly interpret the coalescence factors $B_A$, two important corrections are necessary: I) $B_2$ has to be calculated using the proton $\times$ neutron yields in the denominator, instead of the...

18. Microscopic description of beta decay rates of r process nuclei

Diana Alvear Terrero (TU-Darmstadt/Helmholtz Research Academy Hesse for FAIR (HFHF), Germany & ICIMAF, Cuba)

24/10/2022, 11:40

TBA

19. Heavy quark diffusion in the hot QCD matter

Santosh Kumar Das (School of Physical Science, Indian Institute of Technology Goa, India)

24/10/2022, 12:05

Talk

The heavy quarks (HQs) are considered to be effective probes to study the evolution of the QGP. We study the dynamics of HQs in a hot QCD medium with a time-correlated noise, η. We have introduced the effect of memory through η and the dissipative force in the Generalized Langevin equation. We supposed that the time correlations of the colored noise decay exponentially with time, called the...

5. Dynamics of the QGP phase at finite baryon density

Olga Soloveva (Goethe University Frankfurt)

25/10/2022, 10:00

Talk

We present equilibrium as well as out-of-equilibrium properties of the strongly interacting QGP medium under extreme conditions of high temperature $T$ and high baryon densities or baryon chemical potentials $\mu_B$ within a kinetic approach. We will explore first the thermodynamic and transport properties of the QGP close to equilibrium in the framework of effective models with $N_f=3$ active...

4. Mechanisms for deuteron production in HICs with PHQMD transport approach

Gabriele Coci (HFHF & Goethe University, Frankfurt)

25/10/2022, 10:25

Talk

The Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) is a microscopic transport approach designed to describe the dynamical formation of clusters in HICs [1]. Within this framework we discuss the production of deuterons by two different mechanisms. The first one is the 'kinetic' formation of deuterons by inelastic $NNN \rightarrow N d$ and $\pi NN \rightarrow \pi d$ scattering processes which...

2. Exploring jet transport coefficients by elastic scattering in the strongly interacting quark-gluon plasma

Ilia Grishmanovskii (ITP, Frankfurt)

25/10/2022, 10:50

Talk

We study the interaction of leading jet partons in a strongly interacting quark-gluon plasma (sQGP) medium based on the effective dynamical quasi-particle model (DQPM). The DQPM describes the non-perturbative nature of the sQGP at finite temperature $T$ and baryon chemical potential $\mu_B$ based on a propagator representation of massive off-shell partons (quarks and gluons) whose properties...

1. Phi meson properties in nuclear matter from dilepton and K+K- decays in a transport approach

Philipp Gubler (JAEA)

25/10/2022, 11:35

Talk

The status of recent theoretical research related to the behavior
of the $\phi$ meson in nuclear matter is reviewed, focusing on observables
that will be measured at the J-PARC E16 experiment, including
dilepton and $K^+K^-$ decay modes and their angular distributions.
The relation of these observables to fundamental properties of the strong
interaction and nuclear matter, such as...

14. Using machine-learning to explore hadron collisions

German Sborlini (Universidad de Salamanca)

25/10/2022, 12:00

Talk

In this talk, we explain how machine-learning techniques (in particular, neural networks) can be applied to reconstruct the parton kinematics. We use as a reference process the production of pion+photon in hadron collisions, although the methodology can be easily extrapolated to any process. Besides reproducing results available in the literature, we provide a practical strategy to estimate...

8. Compact stars and magnetic fields

Daryel Manreza (Universidad de La Habana, Facultad de Física)

27/10/2022, 10:00

Talk

I will review some fundamental aspects about the origin and evolution of magnetic fields in compact objects. From flux conservation in supernova collapse to dynamo models. I will also expose the main difficulties to explain the intense magnetic field measured in magnetars. Finally, I will relate this phenomenology to the magnetic fields observed in heavy ion collisions.

9. Macroscopic Models for Magnetized Compact Stars

Adriel Rodriguez, Dr Gretel Quintero Angulo (University of Havana)

27/10/2022, 10:30

Compact stars (white dwarfs and neutron stars) possess strong magnetic fields that affect their micro and macrophysics. In recent years, several theoretical models of magnetized compact objects have been developed, considering different approximations and assumptions about the geometry and intensity of the stellar magnetic field. Such suppositions reflect on the resulting structure equations,...

16. Equations of state of neutron stars using CompOSE

Achely Martinez (Facultad de Física, Universidad de La Habana, Cuba)

27/10/2022, 10:55

Talk

We review the use of the CompOSE database of equations of state (EoS) of neutron stars. Our goal is to use several EoS to study the maximum mass of neutron stars and try to prove in the mass gap (lack of objects in the interval from 2 to 5 solar masses). We will present how to use the code and how to extract the relevant parameters.

15. CLASS code for numerical cosmological computations

Amanda Castillo (Facultad de Física, Universidad de La Habana, Cuba)

27/10/2022, 11:40

Talk

We describe the use of the numerical code CLASS (Cosmic Linear Anisotropy Solving System) by Julien Lesgourgues. Our main objective is to know the capabilities of this code to use it in the calculation of inflationary models of the early universe in the framework of the Lee-Wick theory. In this talk we will give an introduction of the main features of this numerical code.

10. Stability Analysis of Mixed Stars

Carlos Manuel García

27/10/2022, 12:05

An analysis of the parameter space that characterizes the possible limit of the collapse of a real scalar field with spherical symmetry coupled with matter in a linear way and under two types of constitutive equations (linear and polytropic) is carried out. The methodology for obtaining the solutions involves adjusting the relationships between the energy density of matter (fixed in advance)...

12. Equation of state of photons propagating in magnetized vacuum.

Dr Aurora Perez Martinez (USAL)

28/10/2022, 10:00

Talk

The photon propagation in a magnetized vacuum is described by non-linear electrodynamics. In this framework, the Energy momentum Tensor is obtained using the robust Euler-Hilbert method that allows getting physical quantities in particular the equation of state. The pressure becomes anisotropic and it is possible to define a pressure perpendicular and parallel to the magnetic field. The...

7. Bose-Einstein Condensation of a magnetized gas of charged scalar bosons revisited

Gretel Quintero

28/10/2022, 10:30

Talk

Charged scalar bosons may naturally form in the interior of neutron stars due to the pairing of protons with antiparallel spins. Although the concentration of proton pairs is small with respect to that of neutrons or neutron pairs, they might still have a relevant role in the macrophysics of these compact objects, especially in connection to their response to the strong magnetic fields of...

3. Effects of the magnetic field on gravitational waves from spheroidal strange stars

Ms Samantha López Pérez (ICIMAF)

28/10/2022, 10:55

Talk

The macroscopic structure of magnetized strange stars is deformed due to the anisotropy in the pressures as a consequence of the magnetic field. In this work, we study implication of the magnetic field deformation in gravitational waves emission from strange stars.

6. On the propagation of photons in rotating neutron stars including quantum and gravitational effects.

Adrian William Romero Jorge (ICIMAF)

28/10/2022, 11:40

Talk

Observational evidence indicates that there is a difference between the times of arrival at terrestrial detectors of electromagnetic radiation of different frequencies from space. This delay time has been observed for photons from cosmic rays, galaxies, neutron stars and even black holes. The origin of this delay is due to dispersion of the wave on his journey to Earth, caused by quantum...

13. Scalar field mass estimation from the existence of Dynamical Gravastar

Duvier Fontanella (ICIMAF)

28/10/2022, 12:05

Talk

A value for the mass of the scalar field is estimated from conjecturing the existence of Dynamic Gravastars as Black Hole candidates.
This mass is determined assuming that the mass of the DG corresponds with the intermediate mass gap, fixing around the values determined in GW190521 by the gravitational wave experiments Ligo-Virgo.