Cosmology seminar: Violetta Sagun

Violetta Sagun is a postdoctoral researcher at CFisUC, Department of Physics, University of Coimbra, Portugal

Neutron stars meet constraints from astrophysics, gravitation, high and low energy nuclear physics  

Compact stars are the most exotic and challenging laboratories in the Universe to test the properties of baryonic matter. Understanding the complex phenomena observed in neutron and hybrid stars requires a profound knowledge in a wide range of scientific disciplines. In particular, to formulate a realistic equation of state (EoS) consistent with the available experimental data it is absolutely necessary to know the interaction between particles in super-dense mediums with high precision.

Presently, astrophysical observations are the main source of the constraints on such basic characteristics of neutron stars as their mass, radius, rotation frequency, etc. Another source of information comes from the merger of binary NSs. Thus, the LIGO/Virgo interferometers detection of gravitational waves emitted due to the neutron stars merger, GW170817, set the major restrictions on the tidal deformabilities of the stars involved in the collision and, therefore, on the EoS at the super-high baryonic densities.  At the same time, the performed nucleus-nucleus collision programs provide us with sufficiently accurate and detailed experimental data on the properties of nuclear and hadron matter.

In this talk I will present the first attempt to fulfil simultaneously all nuclear, baryon matter properties, astrophysical and gravitational observations within one EoS with the  induced surface tension (IST). IST approach provides a unique and original way to study different compact astrophysical objects and the high energy nucleus-nucleus collisions within a unified approach.​


Robert Hagala
Tags: High-energy astrophysics
Published Jan. 9, 2019 12:55 PM - Last modified Jan. 9, 2019 6:55 PM