Hydrodynamical Collapse of Neutron Stars due to Hadron-Quark Phase Transition

TL;DR

This paper investigates the hydrodynamical collapse of neutron stars triggered by a hadron-quark phase transition, using simulations to analyze matter ejection and oscillation modes.

Contribution

It introduces a spherical Lagrangian hydrodynamic model to simulate neutron star collapse with phase transitions at various times.

Findings

Significant matter ejection from the star's surface.

Star exhibits fundamental and first pressure mode oscillations.

Collapse dynamics depend on the timing of the phase transition.

Abstract

We present studies of the collapse of neutron stars that undergo a hadron-quark phase transition. A spherical Lagrangian hydrodynamic code has been written. As initial condition we take different neutron star configurations taking into account its density, energy density and pressure distribution. The phase transition is imposed at different evolution times. We have found that a significant amount of matter on the surface can be ejected while the remaining star rings in the fundamental and first pressure modes.