FROM CRUST TO CORE: A BRIEF REVIEW OF QUARK MATTER IN NEUTRON STARS

2010 ◽  
Vol 19 (08n10) ◽  
pp. 1427-1436 ◽  
Author(s):  
F. WEBER ◽  
O. HAMIL ◽  
K. MIMURA ◽  
R. NEGREIROS
Keyword(s):  
Neutron Stars ◽  
Electric Fields ◽  
Quark Matter ◽  
Strange Quark ◽  
Thermal Evolution ◽  
Reaction Rates ◽  
Strange Quark Matter ◽  
Compact Objects ◽  
Compact Stars ◽  
The Impact

This paper provides a short overview of the multifaceted, possible role of quark matter for compact stars (neutron stars and strange quark matter stars). We began with a variational investigation of the maximum possible energy densities in the cores of neutron stars. This is followed by a brief discussion of the possible existence of quark matter in the cores of neutron stars and how such matter could manifest itself in neutron star observables. The possible presence of color superconducting strange quark matter nuggets in the crusts of neutron stars is reviewed next, and their impact on the pycnonuclear reaction rates in the crusts of neutron stars is discussed. The second part of the paper discusses the impact of ultra-strong electric fields on the bulk properties of strange quark matter stars and presents results of a preliminary study that models the thermal evolution of radio-quiet, X-ray bright, central compact objects (CCOs).

scholarly journals COMPACT STARS AND MAGNETIZED CFL MATTER

2011 ◽  
Vol 20 (supp02) ◽  
pp. 84-92 ◽  
Author(s):  
AURORA PÉREZ MARTíNEZ ◽  
RICARDO GONZÁLEZ FELIPE ◽  
DARYEL MANREZA PARET
Keyword(s):  
Magnetic Field ◽  
Neutron Stars ◽  
Ground State ◽  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Compact Stars ◽  
Mit Bag Model ◽  
The Stability ◽  
The Magnetic Field

The stability of the color flavor locked phase in the presence of a strong magnetic field is investigated within the phenomenological MIT bag model. It is found that the minimum value of the energy per baryon in a color flavor locked state at vanishing pressure is lower than the corresponding one for unpaired magnetized strange quark matter and, as the magnetic field increases, the energy per baryon decreases. This implies that magnetized color flavor locked matter is more stable and could become the ground state inside neutron stars. The anisotropy of the pressures is discussed. The mass-radius relation for such stars is also studied.

scholarly journals Dark Matter, Neutron Stars, and Strange Quark Matter

2010 ◽  
Vol 105 (14) ◽  
Author(s):  
M. Angeles Perez-Garcia ◽  
Joseph Silk ◽  
Jirina R. Stone
Keyword(s):  
Dark Matter ◽  
Neutron Stars ◽  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter

scholarly journals Strange matter in compact stars

2018 ◽  
Vol 171 ◽  
pp. 08001 ◽  
Author(s):  
Thomas Klähn ◽  
David B. Blaschke
Keyword(s):  
Quark Matter ◽  
Strange Quark ◽  
Chiral Symmetry Breaking ◽  
Dense Matter ◽  
Strange Quark Matter ◽  
Compact Stars ◽  
Hadronic Matter ◽  
Model Description ◽  
Severe Problem ◽  
Strange Matter

We discuss possible scenarios for the existence of strange matter in compact stars. The appearance of hyperons leads to a hyperon puzzle in ab-initio approaches based on effective baryon-baryon potentials but is not a severe problem in relativistic mean field models. In general, the puzzle can be resolved in a natural way if hadronic matter gets stiffened at supersaturation densities, an effect based on the quark Pauli quenching between hadrons. We explain the conflict between the necessity to implement dynamical chiral symmetry breaking into a model description and the conditions for the appearance of absolutely stable strange quark matter that require both, approximately masslessness of quarks and a mechanism of confinement. The role of strangeness in compact stars (hadronic or quark matter realizations) remains unsettled. It is not excluded that strangeness plays no role in compact stars at all. To answer the question whether the case of absolutely stable strange quark matter can be excluded on theoretical grounds requires an understanding of dense matter that we have not yet reached.

scholarly journals Neutron Stars, Strange Pulsars and Strange Dwarfs

1996 ◽  
Vol 160 ◽  
pp. 135-136
Author(s):  
Fridolin Weber ◽  
Norman K. Glendenning
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Strong Interaction ◽  
Ground State ◽  
Strange Quark ◽  
Complete Sequence ◽  
Strange Quark Matter ◽  
Compact Stars ◽  
Strange Dwarfs ◽  
Separate Class

The hypothesis that strange quark matter may be the absolute ground state of the strong interaction (not56Fe) has been raised independently by Boder and Witten. If the hypothesis is true, then a separate class of compact stars could exist, which are calledstrange matter stars. The properties of the complete sequence of such stars, which range from compact neutron-star-like strange stars to strange dwarfs to strange planets. The latter two constitute the strange counterparts of ordinary white dwarfs and planets, respectively. The properties of these objects are discussed in this paper.

scholarly journals STRANGENESS IN NEUTRON STARS

2007 ◽  
Vol 16 (02n03) ◽  
pp. 231-245 ◽  
Author(s):  
FRIDOLIN WEBER ◽  
ALEXANDER HO ◽  
RODRIGO P. NEGREIROS ◽  
PHILIP ROSENFIELD
Keyword(s):  
Neutron Stars ◽  
Quark Matter ◽  
Strange Quark ◽  
Baryon Number ◽  
Heavy Ion ◽  
Strange Quark Matter ◽  
Relativistic Heavy Ion Collision ◽  
Quark Deconfinement ◽  
Ion Collision ◽  
High Pressure Environment

It is generally agreed on that the tremendous densities reached in the centers of neutron stars provide a high-pressure environment in which several intriguing particles processes may compete with each other. These range from the generation of hyperons to quark deconfinement to the formation of kaon condensates and H-matter. There are theoretical suggestions of even more exotic processes inside neutron stars, such as the formation of absolutely stable strange quark matter. In the latter event, neutron stars would be largely composed of strange quark matter possibly enveloped in a thin nuclear crust. This paper gives a brief overview of these striking physical possibilities with an emphasis on the role played by strangeness in neutron star matter, which constitutes compressed baryonic matter at ultra-high baryon number density but low temperature which is not accessible to relativistic heavy ion collision experiments.

scholarly journals Strange Quark Stars — A Review

2003 ◽  
Vol 214 ◽  
pp. 191-198 ◽  
Author(s):  
R. X. Xu
Keyword(s):  
Neutron Stars ◽  
Quark Matter ◽  
Strange Quark ◽  
Major Part ◽  
Strange Quark Matter ◽  
Strange Stars ◽  
Quark Stars

A pedagogical overview of strange quark matter and strange stars is presented. After a historical notation of the research and an introduction to quark matter, a major part is devoted to the physics and astrophysics of strange stars, with attention being paid to the possible ways by which neutron stars and strange stars can be distinguished in astrophysics. Recent possible evidence for bare strange stars is also discussed.

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