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We review the equation of state of matter in neutron stars from the solid crust through the liquid nuclear matter interior to the quark regime at higher densities. We focus in detail on the question of how quark matter appears in neutron…

High Energy Astrophysical Phenomena · Physics 2018-08-06 Gordon Baym , Tetsuo Hatsuda , Toru Kojo , Philip D. Powell , Yifan Song , Tatsuyuki Takatsuka

Fuzzy Dark Matter (FDM), particularly in the $10^{-22}$ eV mass regime is frequently used to characterize wave-like interference effects. It exhibits macroscopic wave properties, which drive distinct baryonic dynamics within collapsed…

Astrophysics of Galaxies · Physics 2026-04-28 Alexander Tocher , Anastasia Fialkov , Simon May , Ralf S. Klessen , Simon C. O. Glover , Paul C. Clark , Tibor Dome

We investigate the hadron-quark phase transition in cold neutron stars in light of (i) the observed limits on the maximum-mass of heavy pulsars, (ii) constraints on the tidal properties inferred from the gravitational waves emitted in…

High Energy Astrophysical Phenomena · Physics 2020-09-11 German Malfatti , Milva G. Orsaria , Ignacio F. Ranea-Sandoval , Gustavo A. Contrera , Fridolin Weber

The condensation of baryons within a dark matter (DM) halo during galaxy formation should result in some contraction of the halo as the combined system settles into equilibrium. We quantify this effect on the cuspy primordial halos…

Astrophysics of Galaxies · Physics 2022-09-21 Pengfei Li , Stacy S. McGaugh , Federico Lelli , James M. Schombert , Marcel S. Pawlowski

The low velocity part of a kinetic equilibrium dark matter distribution has higher phase space density and is more easily incorporated in formation of a low mass galaxy than the high velocity part. For relativistically decoupling fermions…

Astrophysics · Physics 2009-10-31 Jes Madsen

The properties of dense hadronic and quark matter and its relation to compact stars are discussed. In a bottom-up approach one starts with nuclear and hypernuclear physics at low density and extrapolates hadronic matter to large densities.…

Astrophysics · Physics 2009-09-29 J. Schaffner-Bielich

The properties of hadron screening masses around the deconfinement phase transition at finite baryonic density can be studied by evaluating the Taylor coefficients with respect to the iso-scalar and iso-vector chemical potentials. We…

The string melting version of a multi-phase transport model is often applied to high-energy heavy-ion collisions since the dense matter thus formed is expected to be in parton degrees of freedom. In this work we improve its quark…

Nuclear Theory · Physics 2017-07-26 Yuncun He , Zi-Wei Lin

The spectroscopic properties of the doubly heavy spin-$1/2$ baryons $\Xi_{QQ'}$, $\Xi'_{QQ'}$, $\Omega_{QQ'}$ and $\Omega'_{QQ'}$, with heavy quarks $Q$ and $Q'$ being $b$ or/and $c$, are investigated in cold nuclear matter. In particular,…

High Energy Physics - Phenomenology · Physics 2019-10-16 K. Azizi , N. Er

We discuss two new DoS approaches for finite density lattice QCD. The paper extends a recent presentation of the new techniques based on Wilson fermions, while here we now discuss and test the case of finite density QCD with staggered…

High Energy Physics - Lattice · Physics 2019-12-12 Christof Gattringer , Michael Mandl , Pascal Törek

We study the evolution of matter composition from nuclear to quark densities in the confining regime, by extending an ideal model of Quarkyonic matter, IdylliQ model, to multi-flavor systems including strangeness. The model provides a dual…

Nuclear Theory · Physics 2026-03-24 Yuki Fujimoto , Toru Kojo , Larry McLerran

The present work is an endeavour to connect the properties of tiny nearly massless objects with those of some of the most massive ones, the compact stars. Since 1996 there is major influx of X-ray and $\gamma$ ray data from binary stars,…

Astrophysics · Physics 2009-10-31 Subharthi Ray , Jishnu Dey , Mira Dey

We discuss stiffening of dense matter in two color QCD (QC$_2$D) where hadrons are mesons and diquark baryons. We study two models which describe a transition of matter from the Bose-Einstein-Condensation regime at low density to the…

High Energy Physics - Phenomenology · Physics 2022-04-06 Toru Kojo , Daiki Suenaga

The densest predicted state of matter is colour-superconducting quark matter, in which quarks near the Fermi surface form a condensate of Cooper pairs. This form of matter may well exist in the core of compact stars, and the search for…

Nuclear Theory · Physics 2009-11-10 Mark G Alford

The idea of confinement states that in certain systems constituent particles can be discerned only indirectly being bound by an interaction whose strength increases with increasing particle separation. Though the most famous example is the…

Strongly Correlated Electrons · Physics 2009-12-06 B. Lake , A. M. Tsvelik , S. Notbohm , D. A. Tennant , T. G. Perring , M. Reehuis , C. Sekar , G. Krabbes , B. Büchner

The dense matter equation of state is of great interest due to the recent development of astrophysical observations for neutron stars. A rapid increase in pressure indicates a continuous crossover from a hadron phase to a quark phase…

Nuclear Theory · Physics 2026-05-19 Hiroyuki Tajima , Kei Iida , Toru Kojo , Haozhao Liang

As an alternative approach to the infinite-array description of dense matter in the Skyrme model, we report about the properties of a single skyrmion on a compact 3-sphere of finite radius. The density of this matter can be increased by…

High Energy Physics - Phenomenology · Physics 2007-05-23 A. Wirzba

According to the now strongly supported concordance $\Lambda$CDM model, galaxies may be grossly described as a luminous component embedded in a dark matter halo. The density profile of these mass dominating haloes may be determined by N -…

Cosmology and Nongalactic Astrophysics · Physics 2014-02-04 A. Del Popolo , V. F. Cardone

I review a number of recent developments in the physics of compact stars containing deconfined quark matter, including (a)~their cooling with possible phase transition from a fully gapped to a gapless phase of QCD at low temperatures and…

High Energy Astrophysical Phenomena · Physics 2017-12-06 Armen Sedrakian

We explore the hadron properties in dense baryonic matter in a unified way by using a Skyrme model constructed with an effective Lagrangian which includes the $\rho$ and $\omega$ vector mesons as hidden gauge bosons and is valid up to…

High Energy Physics - Phenomenology · Physics 2015-06-18 Yong-Liang Ma , Masayasu Harada , Hyun Kyu Lee , Yongseok Oh , Mannque Rho
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