18-22 September 2023
GSI Darmstadt, Germany
Europe/Berlin timezone

New Equation of State for Supernova and Binary Neutron Star Merger Simulations

20 Sep 2023, 10:16
Main Lecture Hall (GSI Darmstadt, Germany)

Main Lecture Hall

GSI Darmstadt, Germany

Südbau (SB1), GSI Campus
Poster Theory of supernovae and neutron stars Poster flash talks


Prof. Debades Bandyopadhyay (Aliah University)


Recently, we constructed a new equation of state (EoS) table including the Bose-Einstein
condensate of negatively charged kaons for core collapse supernova and binary neutron star merger simulations. The nuclear statistical equilibrium model
including excluded volume effects was used to describe the matter below the saturation density whereas the uniform matter composed of
neutrons, protons, electrons and $K^-$ condensate at higher
densities was treated in the relativistic hadron field theory with density
dependent couplings. The equation of state table was generated for a wide range
of density ($10^{-12}$ to $\sim 1$ fm$^{-3}$), positive charge fraction
(0.01 to 0.60) and temperature (0.1 to 158.48 MeV). As soon as the threshold
condition of the Bose-Einstein condensate was reached, electrons were replaced by
the negatively charged kaons in the condensate. The impact of antikaon condensate was investigated on different thermodynamic quantities. The charge neutral and beta-equilibrated matter with the condensate made the EoS softer compared to that without the condensate resulting in the reduction of the maximum neutron star mass but it was above the 2 solar mass benchmark. This softening in the EoS might be attributed to the equal number of neutrons and protons after the appearance of the condensate. This implies zero symmetry energy contribution in the EoS. It would be worth investigating the impacts of the antikaon condensate on the evolution of core collapse supernovae and binary neutron star mergers particularly on the
ejected matter and nucleosynthesis in binary neutron mergers.

Primary authors

Prof. Debades Bandyopadhyay (Aliah University) TUHIN MALIK (CFisUC, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal) Prof. Sarmistha Banik (BITS Pilani, Hyderabad, India)

Presentation Materials