Constraining the properties of dense matter and neutron stars by combining nuclear physics and gravitational waves from GW170817

Understand

Gravitational waves from neutron-star mergers are expected to provide stringent constraints on the structure of neutron stars.

• At the same time, recent advances in nuclear theory have enabled reliable calculations of the low density equation of state using effective field theory based Hamiltonians and advanced techniques to solve the quantum many-body problem.
• In this paper, we address how the first observation of gravitational waves from GW170817 can be combined with modern calculations of the equation of state to extract useful insights about the equation of state of matter encountered inside neutron stars.
• We analyze the impact of various uncertainties and we show that the tidal deformability extracted from GW170817 is compatible, while less constraining, than modern nuclear physics knowledge.