Investigating Strangeness: from Accelerators to Compact Stellar Objects

Session

Part 3

14 May 2014, 14:30

Aula Conversi (Laboratori Nazionali di Frascati)

Conveners

Part 3

• Alessandro Drago (FE)

17. Single vs multi nucleon absorption processes in low-energy K-nuclei interactions

Ivana Tucakovic (LNF)

14/05/2014, 14:30

One of the most interesting aspects of low energy QCD in a strangeness sector is to understand how hadron masses and interactions change in the nuclear environment. The antikaon-nucleon potential is investigated searching for signals from possible bound kaonic clusters. The existence of such objects is very debated, and it would open the possibility for the formation of very dense baryonic...

18. Anisotropic systems of Fermions: gravitational equilibrium and dynamic stability

Giuseppe Alberti (Univ.Roma1)

14/05/2014, 15:00

Systems of selfgravitating Fermions constitute a topic of great interest in astrophysics, due to the wide range of applications, and are used also to explain dark matter in galaxies and clusters of galaxies. Here, we study the gravitational equilibrium of spherical models describing a semidegenerate collisionless gas. The Fermi-Dirac distribution function, modified by a cutoff term in order to...

19. Galaxy clusters in presence of dark energy

Martina Donnari (Univ. Sapienza)

14/05/2014, 15:30

Dark energy, discovered by observations of the SN Ia at redshift z<1, affects the large scale stellar structures in the Universe, like the galaxy clusters. Being the observed velocities of the galaxies inside a cluster largely smaller than the light velocity, we can derive, and numerically solve, the gravitational equilibrium equation in presence of dark energy by considering the Newtonian...

20. Gravity and Thermodynamics. I. Fundamental principles

Giacomo FRAGIONE (Univ. Sapienza)

14/05/2014, 16:30

Thermodynamics is very important in the dynamical evolution of globular clusters. The effects of the stellar encounters and the evaporation of stars due to the presence of the tidal forces of the galaxy suggest the possibility of considering a thermodynamical equilibrium and therefore a new treatment including the statistical mechanics. It is possible to construct equilibrium models with a...

21. Gravity and thermodynamics: a new point of view in the analysis of equilibrium and dynamical evolution of globular clusters.

Prof. Marco Merafina (University of Rome La Sapienza)

14/05/2014, 17:00

In the analysis of the evolution of globular clusters, stellar encounters strongly contribute in phase space mixing of stellar orbits. In this scenario, thermodynamics plays a central role in the gravitational equilibrium and stability of the clusters, being binary relaxation time shorter than the age of such systems. On the other hand, the observations of luminosity profiles of globular...