2024-01-05 Abstract
Title: Challenges of measuring the neutron star equation of state using gravitational wave
Speaker: Hung Tan (Syracuse)
Date: January 5 at 14:30
Location: R521, General Building II
Abstract:
The detection of gravitational radiation opens a new era to gravitational wave astronomy. The event GW170817 is particularly exciting because it shows the potential for using gravitational wave observation to discover microscopic physics. Specifically, new degrees of freedom, such as hyperons or deconfined quarks, can emerge at the core of a neutron star, leading to phase transitions or crossovers. As these new degrees of freedom appear at the core, they often soften the core, making the tidal deformability of the neutron star larger than expected. The tidal deformability is encoded in the gravitational wave signal, providing the microscopic information. However, to extract the deformability from a signal, one can rely on spectral parametrization of equations of state(EoSs) or the EoS insensitive relation. In this talk, I will show that the two methods (spectral parametrization and EoS insensitive relation) can be misleading or smearing out the microscopic information within a neutron star core.