Strongly interacting dark matter described by a first-principles G2 gauge-theory equation of state can be mixed into neutron stars while remaining compatible with current observational constraints.
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Salmi et al.,The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data,Astrophys
12 Pith papers cite this work. Polarity classification is still indexing.
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Multi-wavelength pulse profile modeling of PSR J0437-4715 with radio prior yields mass 1.38±0.03 solar masses and radius 13.25 km at 68% confidence.
An intrinsic degeneracy in two-spot thermal X-ray pulse models creates multi-modal posteriors that can bias neutron star radius estimates by up to 30%.
RGOPT-resummed NNLO pQCD EoS for massive quarks in beta equilibrium is fitted and applied to construct pure quark stars (X=3.08-3.58) and hybrid stars (X~2-2.98) compatible with PSR J0740+6620 and GW190814.
Bayesian analysis finds that the likely ranges of light dark-matter fermion mass and exponential density-profile parameter in hyperon-containing neutron stars are nearly independent of the hadronic model for symmetry-energy slopes between 40 and 58 MeV, with HESS J1731-347 and GW170817 data playing,
A Bayesian combination of eight M-R posteriors for PSR J0030+0451 yields M = 1.46^{+0.09}_{-0.08} M_⊙, R = 12.69^{+0.64}_{-0.55} km while marginalizing over unknown model systematics.
Vector portal fermionic dark matter admixed in neutron stars produces mediator-mass-dependent changes to the equation of state, yielding distinct mass-radius relations and tidal deformabilities that observations can use to constrain the model.
The study examines the effects of hyperons and H-dibaryons on f-mode oscillations in neutron stars using the quark meson coupling model and tests universal relations in the Cowling approximation.
Neutron star observations, especially the heaviest known pulsar masses and GW170817 tidal deformability, provide the strongest restrictions on the allowed cold dense matter equation of state.
Nonparametric GP-based high-density extensions yield softer EOS posteriors with larger uncertainties than parametric PP extensions when jointly constrained by multi-messenger neutron star observations.
Comparative numerical study of radial modes in strange quark stars using CFL, interacting, and linear causal EOS shows all satisfy current mass-radius bounds and produce 4-7 kHz fundamental frequencies.
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Multiwavelength Analysis of PSR J0437-4715 with Pulse Profile Modeling
Multi-wavelength pulse profile modeling of PSR J0437-4715 with radio prior yields mass 1.38±0.03 solar masses and radius 13.25 km at 68% confidence.