With the advent of GW astronomy, a new exciting window into studying matter has been opened. It is then crucial to perform a search for possible GW sources. In this talk I will present two new sources of GW emission from first order phase transitions: the spinodal instability and phase transitions in neutron star mergers. The former is relevant in the context of cosmology, when bubble...

We construct a black hole geometry dual to a (2+1)-dimensional defect in an ambient (3+1)-dimensional gauge theory at non-zero temperature and quark density. The geometry is a solution to the equations of motion of type IIB supergravity with brane sources, a low energy limit of an intersection of stacks of color D3-branes and flavor D5-branes. We consider the case in which the number of...