scholarly journals Strange quark matter and compact stars

2005 ◽  
Vol 54 (1) ◽  
pp. 193-288 ◽  
Author(s):  
F. Weber
Keyword(s):  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Compact Stars

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.

SELF-LENSING EFFECTS FOR COMPACT STARS AND THEIR MASS–RADIUS RELATION

2004 ◽  
Vol 19 (32) ◽  
pp. 2431-2435
Author(s):  
A. R. PRASANNA ◽  
SUBHARTHI RAY
Keyword(s):  
General Relativity ◽  
Neutron Star ◽  
Equation Of State ◽  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Compact Stars ◽  
Strange Stars ◽  
Lensing Effect ◽  
R Relation

During the last couple of years astronomers and astrophysicists have been debating on the fact whether the so-called "strange stars" — stars made up of strange quark matter, have been discovered with the candidates like SAX J1808.4–3658, 4U 1728–34, RX J1856.5–3754, etc. The main contention has been the estimation of radius of the star for an assumed mass of ~ 1.4 M⊙ and to see whether the point overlaps with the graphs for the neutron star equation of state or whether it goes to the region of stars made of strange matter equation of state. Using the well-established formulae from general relativity for the gravitational redshift and the "lensing effect" due to bending of photon trajectories, we, in this letter, relate the parameters M and R with the observable parameters, the redshift z and the radiation radius R∞, thus constraining both M and R for specific ranges, without any other arbitrariness. With the required inputs from observations, one ought to incorporate the effects of self-lensing of the compact stars which has been otherwise ignored in all of the estimations done so far. Nonetheless, these effects of self-lensing make a marked difference for constraints on the M–R relation.

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.

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 Strange quark matter in compact stars

2016 ◽  
Author(s):  
Grigor Alaverdyan ◽  
Yu.L Vartanyana ◽  
G. S Hajyana ◽  
G. B Alaverdyana ◽  
A. K Grigoryan ◽  
...  
Keyword(s):  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Compact Stars

Strange Quark Matter as Dark Matter

2019 ◽  
Vol 22 (4) ◽  
pp. 311-317
Author(s):  
Hidezumi Terazawa
Keyword(s):  
Dark Matter ◽  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Quark Stars

New forms of matter such as super-hypernuclei (strange quark matter) and superhypernuclear stars (strange quark stars) as candidates for dark matter are discussed in some detail, based on the so-called "Bodmer–Terazawa–Witten hypothesis" assuming that they are stable absolutely or quasi-stable (decaying only weakly).

scholarly journals Quark condensates and strange quark matter

1997 ◽  
Vol 56 (1) ◽  
pp. 491-496 ◽  
Author(s):  
G. Peng ◽  
P. Ning ◽  
H. Chiang
Keyword(s):  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter
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