scholarly journals Hybrid neutron stars with the Dyson-Schwinger quark model and various quark-gluon vertices

2015 ◽  
Vol 91 (10) ◽  
Author(s):  
H. Chen ◽  
J.-B. Wei ◽  
M. Baldo ◽  
G. F. Burgio ◽  
H.-J. Schulze
Keyword(s):  
Neutron Stars ◽  
Quark Model

EXOTIC PHASES IN NEUTRON STARS

2008 ◽  
Vol 17 (09) ◽  
pp. 1635-1647 ◽  
Author(s):  
A. LI ◽  
G. F. BURGIO ◽  
U. LOMBARDO ◽  
G. X. PENG
Keyword(s):  
Neutron Stars ◽  
Quark Model ◽  
Microscopic Approach ◽  
Density Dependent ◽  
Kaon Condensation ◽  
Two Phases ◽  
Dependent Mass ◽  
Quark Phase ◽  
Exotic Phases

The appearance of exotic phases in neutron stars is studied. The possible transition from hadron to quark phase is studied within the density dependent mass quark model, and the kaon condensation within the Nelson and Kaplan model. In both cases a microscopic approach is adopted for dense hadron matter. From the study of the possible coexistence between the two phases it is found that the hybrid phase may strongly hinder the onset of kaon condensation.

EFFECTS OF HYPERON MIXING ON NEUTRON STAR PROPERTIES

2008 ◽  
Vol 17 (09) ◽  
pp. 1739-1752
Author(s):  
TATSUYUKI TAKATSUKA
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Quark Model ◽  
Body Force ◽  
String Junction ◽  
Promising Candidate ◽  
Fermi Surfaces ◽  
Realistic Approach ◽  
Three Body

From a serious inconsistency between theory and observations for the mass of hyperon-mixed neutron stars (NSs), it is stressed that some "extra repulsion" is missing in hypernuclear systems and three-body force repulsion is tested for the cases with phenomenological Illinoi's type, 2π-exchange via Δ-excitation type(2πΔ) and string-junction quark model(SJM). It is remarked that the "extra repulsion" should have a nature to act universally, i.e., independent of baryon species. The SJM three-body repulsion can meet the condition because of flavor-independence and {2πΔ+ SJM } scheme is shown to be a promising candidate for the "extra repulsion". Occurence of Λ and Σ- superfluidities are shown also by a realistic approach, which importantly supports the idea of nonstandard fast "hyperon cooling" scenario to explain colder class NSs. However, less attractive ΛΛ interaction suggested by the "NAGARA event" [Formula: see text] leads to the disappearance of Λ superfluidity and the breaking down of the scenario. In this connection, the revival of "Λ superfluidity" due to ΛΣ- pairing instead of ΛΛ one is discussed in a new scheme of "bubble shell" hypothesis where the matching of two different Fermi surfaces is forced.

Neutron Stars and "Black Holes"

1973 ◽  
Vol 110 (7) ◽  
pp. 441 ◽  
Author(s):  
Ya.B. Zel'dovich
Keyword(s):  
Black Holes ◽  
Neutron Stars

Cooling of neutron stars and superfluidity in their cores

1999 ◽  
Vol 169 (8) ◽  
pp. 825 ◽  
Author(s):  
Dmitrii G. Yakovlev ◽  
Kseniya P. Levenfish ◽  
Yurii A. Shibanov
Keyword(s):  
Neutron Stars
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