Matter at high density and low temperature is expected to be a color superconductor, which
is a degenerate Fermi gas of quarks with a condensate of Cooper pairs near the Fermi …

Investigations of deconfined quark matter within NJL-type models are reviewed, focusing on
the regime of low temperatures and “moderate” densities, which is not accessible by …

We study the mass-radius curve of hybrid stars, assuming a single first-order phase
transition between nuclear and quark matter, with a sharp interface between the quark …

Astrophysicists distinguish between three different kinds of compact stars. These are white
dwarfs, neutron stars, and black holes. The former contain matter in one of the densest forms …

We show that a hybrid (nuclear+ quark matter) star can have a mass-radius relationship very
similar to that predicted for a star made of purely nucleonic matter. We show this for a …

Context. Recently, Doroshenko and collaborators reported a very low-mass compact star, a
Central Compact Object named XMMU J173203. 3− 344518 inside the supernova remnant …

Abstract The Einstein–Maxwell (or Einstein) system of field equations plays a substantial
role in the modeling of compact stars. Although due to its non-linearity getting an exact …

The recent observation of the pulsar PSR J1614-2230 with a mass of 1.97±0.04 M☉ gives a
strong constraint on the quark and nuclear matter equations of state (EoS). We explore the …

We explore the implications of the recent radius determination of PSR J 0740+ 6620 by the
NICER experiment, combined with the neutron skin measurement by the PREX-II …

The composition of neutron stars at the extreme densities reached in their cores is currently
unknown. Besides nuclear matter of normal neutrons and protons, the cores of neutron stars …