Detectability of Finite-Temperature Effects From Neutron Star Mergers with Next-Generation Gravitational Wave Detectors
arxiv(2023)
Abstract
Observations of the high-frequency gravitational waves (GWs) emitted by the
hot and massive remnant of a binary neutron star merger will provide new probes
of the dense-matter equation of state (EoS). We show that current uncertainties
in the thermal physics can cause the emergent GW spectum to differ by a degree
comparable to changing the cold EoS by ±∼120 m in the characteristic
radius of a neutron star. Unless a very close binary neutron star merger takes
place, these effects are unlikely to be measurable with current GW detectors.
However, with proposed next-generation detectors such as Cosmic Explorer or
Einstein Telescope, the effects can be distinguished for events at distances of
up to 80-200 Mpc, if the cold EoS is sufficiently well constrained.
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