Simulations with a tunable phase-transition parameter in neutron-star equations of state produce unique post-merger gravitational-wave peaks and link Δp to the prompt-collapse mass threshold, with Δp ≲ 0.04 implied for GW170817.
High-mass twin stars with a multi-polytrope EoS
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abstract
We show that in the 3-polytropes model of Hebeler et al. \cite{Hebeler:2013nza} for the neutron star equation of state at supersaturation densities a third family of compact stars can be obtained which confirms the possibility of high-mass twin stars that have coincident masses $M_1=M_2\approx 2~M_\odot$ and significantly different radii $|R_1-R_2|>2-3 $ km. We show that the causality constraint puts severe limitations on the maximum mass of the third family sequence which can be relaxed when this scheme is extended to four polytropes thus mimicking a realistic high-density matter EoS.
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Steep matter-density gradients in neutron stars can produce neutrino-antineutrino pairs analogous to the Schwinger effect.
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Distinct Signatures of the Nature of Phase Transition in Binary Neutron Star Mergers
Simulations with a tunable phase-transition parameter in neutron-star equations of state produce unique post-merger gravitational-wave peaks and link Δp to the prompt-collapse mass threshold, with Δp ≲ 0.04 implied for GW170817.
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Gradient-Produced Neutrinos
Steep matter-density gradients in neutron stars can produce neutrino-antineutrino pairs analogous to the Schwinger effect.