Color superconductivity in compact stellar hybrid configurations

Ranea‐Sandoval, Ignacio F.; Orsaria, M.; Weber, Fridolin; Spinella, William M.

doi:10.1103/physrevc.96.065807

Cited by 18 publications

(25 citation statements)

References 77 publications

(103 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, we consider a model in which color superconductivity in the 2SC+s phase is included within the LNJL model [46]. This model has three free parameters: the vector coupling constant, η v , the diquark coupling constant, η qq and the effective strange quark mass in vacuum, M 0 s .…”

Section: Quark Mattermentioning

confidence: 99%

Oscillation modes of hybrid stars within the relativistic Cowling approximation

Ranea‐Sandoval

Guilera

Mariani

et al. 2018

J. Cosmol. Astropart. Phys.

Self Cite

View full text Add to dashboard Cite

The first direct detection of gravitational waves has opened a new window to study the Universe and would probably start a new era: the gravitational wave Astronomy. Gravitational waves emitted by compact objects like neutron stars could provide significant information about their structure, composition and evolution.In this paper we calculate, using the relativistic Cowling approximation, the oscillations of compact stars focusing on hybrid stars, with and without a mixed phase in their cores. We study the existence of a possible hadron-quark phase transition in the central regions of neutron stars and the changes it produces on the gravitational modes frequencies emitted by these stars. We pay particular attention to the g-modes, which are extremely important as they could signal the existence of pure quark matter inside neutron stars. Our results show a relationship between the frequency of the g-modes and the constant speed of sound parametrization for the quark matter phase. We also show that the inclusion of color superconductivity produces an increase on the oscillation frequencies.We propose that observations of g-modes with frequencies f g between 1 kHz and 1.5 kHz should be interpreted as an evidence of a sharp hadron-quark phase transition in the core of a compact object.

show abstract

Section: Quark Mattermentioning

confidence: 99%

Oscillation modes of hybrid stars within the relativistic Cowling approximation

Ranea‐Sandoval

Guilera

Mariani

et al. 2018

J. Cosmol. Astropart. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…To describe quark matter we use the nonlocal SU(3) Nambu-Jona-Lasinio (n3NJL) model discussed in [6,[17][18][19][20][21]. The n3NJL parametrization used is given as "Set I" in [22], and is in better agreement with the empirical quark masses than the parametrization utilized in [6]. We consider three geometries for the range of possible structures in the mixed phase including spherical blobs, rods, and slabs, and calculate the associated static lattice contributions to the neutrino emissivity.…”

Section: Introductionmentioning

confidence: 99%

Neutrino Emissivity in the Quark-Hadron Mixed Phase

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract:In this work we investigate the effect a crystalline quark-hadron mixed phase can have on the neutrino emissivity from the cores of neutron stars. To this end we use relativistic mean-field equations of state to model hadronic matter and a nonlocal extension of the three-flavor Nambu-Jona-Lasinio model for quark matter. Next we determine the extent of the quark-hadron mixed phase and its crystalline structure using the Glendenning construction, allowing for the formation of spherical blob, rod, and slab rare phase geometries. Finally, we calculate the neutrino emissivity due to electron-lattice interactions utilizing the formalism developed for the analogous process in neutron star crusts. We find that the contribution to the neutrino emissivity due to the presence of a crystalline quark-hadron mixed phase is substantial compared to other mechanisms at fairly low temperatures ( < ∼ 10 9 K) and quark fractions ( < ∼ 30%), and that contributions due to lattice vibrations are insignificant compared to static-lattice contributions. There are a number of open issues that need to be addressed in a future study on the neutrino emission rates caused by electron-quark blob bremsstrahlung. Chiefly among them are the role of collective oscillations of matter, electron band structures, and of gaps at the boundaries of the Brillouin zones on bremsstrahlung, as discussed in the summary section of this paper. We hope this paper will stimulate studies addressing these issues.

show abstract

“…The analysis of neutron stars with the presence of deconfined quark mater in their cores, shows that for the NJL models considered in this work a quark matter core is only possible for the last stable star in the M-R diagram. The presence of diquarks can give longer stable hybrid branches [79].…”

Section: Resultsmentioning

confidence: 99%

Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model

et al. 2019

View full text Add to dashboard Cite

We study local and non-local Polyakov Nambu-Jona-Lasinio models and analyze their respective phase transition diagram. We construct hybrid stars using the zero temperature limit of the local and non-local versions of Nambu-Jona-Lasinio model for quark matter and the modern GM1(L) parametrization of the non-linear relativistic mean field model for hadronic matter. We compare our models with data from PSR J1614-2230 and PSR J0343+0432 and also from GW170817 and its electromagnetic counterpart GRB170817A and AT2017gfo. We study observational signatures of the appearance of a mixed phase as a result of modeling a phase transition that mimics the Gibbs formalism and compare the results with the sharp first-order phase transition obtained using the Maxwell construction. We also study in detail the g-mode associated with discontinuities in the equation of state, and calculate non-radial oscillation modes using relativistic Cowling approximation.

show abstract

Color superconductivity in compact stellar hybrid configurations

Cited by 18 publications

References 77 publications

Oscillation modes of hybrid stars within the relativistic Cowling approximation

Oscillation modes of hybrid stars within the relativistic Cowling approximation

Neutrino Emissivity in the Quark-Hadron Mixed Phase

Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model

Contact Info

Product

Resources

About