Speaker
Description
Certain features of the gravitational wave spectrogram from core-collapse supernovae are the imprint of excited oscillation modes of the dense proto-compact star, excited by various manifestations of asymmetric fluid motion. One of the most robust signal components arises from a quadrupolar f/g-mode whose frequency increases from a few hundred Hz to above 1 kHz. In addition, another distinct quadrupolar g-mode at frequencies in the dHz range appears even further inside, at several times nuclear saturation density, whose frequency decreases. I will present the physical origin of this core g-mode, its potential to constrain the speed of sound in the QCD phase diagram, and curious features, such as its absence in our 3D simulations and reasons behind its frequency-decreasing behavior.
