Pseudoscalar Goldstone bosons in the color-flavor locked phase at moderate densities

Kleinhaus, Verena; Buballa, Michael; Nickel, Dominik; Oertel, Micaela

doi:10.1103/physrevd.76.074024

Cited by 16 publications

(30 citation statements)

References 59 publications

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“…The CFL phase with K 0 condensation is called the "CFL-K 0 " phase. Goldstone bosons in CFL and their condensation have also been studied in a different approach, using a Nambu-Jona-Lasinio model [29,30,31,32,33,34].…”

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confidence: 99%

Bulk viscosity in kaon-condensed color–flavor-locked quark matter

Alford¹,

Braby²,

Schmitt³

2008

J. Phys. G: Nucl. Part. Phys.

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Color-flavor locked (CFL) quark matter at high densities is a color superconductor, which spontaneously breaks baryon number and chiral symmetry. Its low-energy thermodynamic and transport properties are therefore dominated by the H (superfluid) boson, and the octet of pseudoscalar pseudo-Goldstone bosons of which the neutral kaon is the lightest. We study the CFL-K 0 phase, in which the stress induced by the strange quark mass causes the kaons to condense, and there is an additional ultra-light "K 0 " Goldstone boson arising from the spontaneous breaking of isospin. We compute the bulk viscosity of matter in the CFL-K 0 phase, which arises from the beta-equilibration processes K 0 ↔ H + H and K 0 + H ↔ H. We find that the bulk viscosity varies as T 7 , unlike the CFL phase where it is exponentially Boltzmann-suppressed by the kaon's energy gap. However, in the temperature range of relevance for r-mode damping in compact stars, the bulk viscosity in the CFL-K 0 phase turns out to be even smaller than in the uncondensed CFL phase, which already has a bulk viscosity much smaller than all other known color-superconducting quark phases.

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mentioning

confidence: 99%

Bulk viscosity in kaon-condensed color–flavor-locked quark matter

Alford¹,

Braby²,

Schmitt³

2008

J. Phys. G: Nucl. Part. Phys.

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“…Earlier calculations based on the NJL model can be found in Ref. [31], while our study updated the results taking the recent constraints into account.…”

Section: Pos(cpod2017)071mentioning

confidence: 64%

Phenomenological QCD equations of state for neutron star mergers

Kojo

2018

Proceedings of Critical Point and Onset of Deconfinement — PoS(CPOD2017)

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We delineate the properties of dense QCD matter through equations of state constrained by the neutron star observations. The two solar mass constraint, the radius constraint of 11-13 km, and the causality constraint on the speed of sound, are used to develop the picture of hadron-quark continuity in which hadronic matter continuously transforms into quark matter. A unified equation of state at zero temperature and β -equilibrium is constructed by a phenomenological interpolation between nuclear and quark matter equations of state. For applications to supernovae and neutron star mergers, the unified equation of state is perturbed by temperature corrections. Critical Point and Onset of Deconfinement

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“…The factors 1/2G and 1/2H result from using the gap equations (18) and (19). Note that by the definition (50), D θ is generally not a function of the Lorentz scalar k 2 .…”

Section: The Decay Constant Of the Chiral Ng Mode πGmentioning

confidence: 99%

“…9 Realistically, the homogeneous diquark pairing described in the present model does not appear in the low density QCD phase diagram, owing to the onset of confinement. The low density behavior of fπ and ∆ can be derived from the pairing gap equation (19) and the bubble results Eq. (58).…”

Section: The Decay Constant Of the Chiral Ng Mode πGmentioning

confidence: 99%

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Generalized Nambu-Goldstone pion in dense matter: A schematic Nambu–Jona-Lasinio model

Song

Baym

2017

Phys. Rev. C

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Chiral symmetry is always broken in cold, dense matter, by chiral condensation at low densities and by diquark condensation at high density. We construct here, within a schematic Nambu-JonaLasinio (NJL) model, the corresponding generalized Nambu-Goldstone pion, πG. As we show, the πG mode naturally emerges as a linear combination of the qq vacuum pion π and the qq diquarkcondensate pionπ, with q the quark field, and continuously evolves with increasing density from being π-like in the vacuum toπ-like in the high density diquark pairing phase. We calculate the density-dependent mass, decay constant, and coupling to quarks of the πG, and derive a generalized Gell-Mann-Oakes-Renner (GMOR) relation in the presence of a finite bare quark mass mq. We briefly discuss the implications of the results to possible Bose condensation of πG in more realistic models.

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Pseudoscalar Goldstone bosons in the color-flavor locked phase at moderate densities

Cited by 16 publications

References 59 publications

Bulk viscosity in kaon-condensed color–flavor-locked quark matter

Bulk viscosity in kaon-condensed color–flavor-locked quark matter

Phenomenological QCD equations of state for neutron star mergers

Generalized Nambu-Goldstone pion in dense matter: A schematic Nambu–Jona-Lasinio model

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