Sound in a Bubbly Hybrid Neutron Star

Abstract

Increasingly precise astrophysical observations of the last decade in combination with intense theoretical studies allow for drawing a conclusion about Quark Matter presence in Neutron Stars interiors. Quark Matter may form the Neutron Star inner core or be immersed in the form of bubbles, or droplets. We demonstrate that the last scenario leads to a highly anomalous character of the sound propagation and the sound speed.Comment: v1: 21 pages, 3 figure