Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-22
Phys.Rev. C71 (2005) 045801
Astronomy and Astrophysics
Astrophysics
19 pages, 8 figures
Scientific paper
10.1103/PhysRevC.71.045801
We show that within a recently developed nonlocal chiral quark model the critical density for a phase transition to color superconducting quark matter under neutron star conditions can be low enough for these phases to occur in compact star configurations with masses below 1.3 M_solar. We study the cooling of these objects in isolation for different values of the gravitational mass. Our equation of state (EoS) allows for 2SC quark matter with a large quark gap \~100 MeV for u and d quarks of two colors that coexists with normal quark matter within a mixed phase in the hybrid star interior. We argue that, if the phases with unpaired quarks were allowed, the corresponding hybrid stars would cool too fast. If they occured for M < 1.3 M_solar, as it follows from our EoS, one could not appropriately describe the neutron star cooling data existing by today. We discuss a "2SC+X" phase, as a possibility to have all quarks paired in two-flavor quark matter under neutron star constraints, where the X-gap is of the order of 10 keV - 1 MeV. Density independent gaps do not allow to fit the cooling data. Only the presence of an X-gap that decreases with increase of the density could allow to appropriately fit the data in a similar compact star mass interval to that following from a purely hadronic model. This scenario is suggested as an alternative explanation of the cooling data in the framework of a hybrid star model.
Blaschke David
Grigorian Hovik
Voskresensky Dmitri
No associations
LandOfFree
Cooling of Neutron Stars with Color Superconducting Quark Cores does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cooling of Neutron Stars with Color Superconducting Quark Cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cooling of Neutron Stars with Color Superconducting Quark Cores will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-598544