Hybrid equations of state for neutron stars with hyperons and deltas

Clevinger, A.; Corkish, J.; Aryal, K.; Dexheimer, V.

doi:10.1140/epja/s10050-022-00745-3

Cited by 11 publications

(1 citation statement)

References 40 publications

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“…Presence of exotica makes dense matter EOS softer resulting in less massive CSs [29,30]. With some recent models of highly dense matter with hyperons the maximum mass has been achieved near 2.2 M , the lower limit (2.18M ) of recently observed mass of PSR J0952 − 0607 [31] is marginally satisfied [11,32]. The same problem comes with matter modelled with (anti)kaon condensates.…”

Section: Introductionmentioning

confidence: 96%

Hybrid stars are compatible with recent astrophysical observations

Kumar¹,

Thapa²,

Sinha³

2023

Preprint

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Compact stars (CS) are stellar remnants of massive stars. Inside CSs the density is so high that matter is in subatomic form composed of nucleons. With increase of density of matter towards the centre of the objects other degrees of freedom like hyperons, heavier non-strange baryons, meson condensates may appear. Not only that at higher densities, the nucleons may get decomposed into quarks and form deconfined strange quark matter (SQM). If it is so then CSs may contain SQM in the core surrounded by nucleonic matter forming hybrid stars (HSs). However, the nature and composition of matter inside CSs can only be inferred from the astrophysical observations of these CSs. Recent astrophysical observations in terms of CS mass-radius (M-R) relation and gravitational wave (GW) observation indicate that the matter should be soft in the intermediate density range and stiff enough at higher density range to attain the maximum possible mass above 2 M which is not compatible with pure hadronic equation of states (EOSs). Consequently, we study the HS properties with different models of SQM and find that within vector bag model considering density dependent bag parameter, the model goes well with the astrophysical observations so far.

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Section: Introductionmentioning

confidence: 96%

Hybrid stars are compatible with recent astrophysical observations

Kumar¹,

Thapa²,

Sinha³

2023

Preprint

View full text Add to dashboard Cite

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Effects of hyperon potentials and symmetry energy in quark deconfinement

Kumar,

Aryal,

Clevinger

et al. 2024

Physics Letters B

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Dense-matter equation of state at zero & finite temperature

Clevinger,

Dexheimer,

Peterson

2024

EPJ Web Conf.

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At high density, matter is expected to undergo a phase transition to deconfined quark matter. Although the density at which it happens and the strength of the transition are still largely unknown, we can model it to be in agreement with known experimental data and reliable theoretical results. We discuss how deconfinement in dense matter can be affected by both by temperature and by strong magnetic fields within the Chiral Mean Field (CMF) model. To explore different dependencies in our approach, we also explore how deconfinement can be affected by the assumption of different degrees of freedom, different vector coupling terms, and different deconfining potentials, all at zero temperature. Both zero-net-strangeness and isospin-symmetric heavy-ion collision matter and beta-equilibrated charge-neutral matter in neutron stars are discussed.

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Hybrid equations of state for neutron stars with hyperons and deltas

Cited by 11 publications

References 40 publications

Hybrid stars are compatible with recent astrophysical observations

Hybrid stars are compatible with recent astrophysical observations

Effects of hyperon potentials and symmetry energy in quark deconfinement

Dense-matter equation of state at zero & finite temperature

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