Goldstone boson currents in a kaon condensed color-flavor locked phase

Gerhold, A.; Schäfer, Thomas; Kryjevski, Andrei

doi:10.1103/physrevd.75.054012

Cited by 20 publications

(26 citation statements)

References 31 publications

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“…Our results at T = 0 are in qualitative agreement with the effective field theory prediction that the first gapless mode in the CFLK 0 phase is electrically charged [37][38][39]. According to these works, there could be a second phase transition at lower chemical potential, where a neutral mode becomes gapless as well.…”

Section: A Phase Diagramsupporting

confidence: 90%

“…In Ref. [39] it was found that at T = 0 the gCFLK 0 * phase is reached from the ordinary gCFLK 0 phase in a first-order phase transition, where the condensate ∆ (s) 77 drops substantially. This is not very different from our CFLK 0 → gCFL phase transition, which is also first order and accompanied by a strong drop of ∆ (s) 77 .…”

Section: The Gcfl Window Between Normal and Cflk 0 Phasementioning

confidence: 99%

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Nambu–Jona-Lasinio model of homogeneous neutral quark matter: Pseudoscalar diquark condensates revisited

Basler

Buballa

2010

Phys. Rev. D

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We use a Nambu-Jona Lasinio type model to investigate the phase diagram of dense quark matter under neutron star conditions in mean field approximation. The model contains selfconsistently determined quark masses and allows for diquark condensation in the scalar as well as in the pseudoscalar channel. The latter gives rise to the possibility of K 0 condensation in the CFL phase. In agreement with earlier studies we find that this CFLK 0 phase covers large regions of the phase diagram and that the predominant part of this phase is fully gapped. We show, however, that there exists a region at very low temperatures where the CFLK 0 solutions become gapless, possibly indicating an instability towards anisotropic or inhomogeneous phases. The physical significance of solutions with pseudoscalar diquark condensates in the 2SC phase is discussed as well.

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Section: A Phase Diagramsupporting

confidence: 90%

Section: The Gcfl Window Between Normal and Cflk 0 Phasementioning

confidence: 99%

Nambu–Jona-Lasinio model of homogeneous neutral quark matter: Pseudoscalar diquark condensates revisited

Basler

Buballa

2010

Phys. Rev. D

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“…In fact, these situations get more complicated than the simple (T, µ) phase diagram, because they typically involve extremely large magnetic field ranging roughly 10 12 − 10 18 G (gauss), and the QCD matter can feature completely new behaviors under these conditions. Examples include magnetic catalysis [3], anomalous axial current in dense matter [4], chiral magnetic effect [5], new mechanism of pulsar kicks [6], spontaneous magnetization of neutron stars [7], etc to name a few.…”

Section: Introductionmentioning

confidence: 99%

Holographic chiral magnetic spiral

Kim

Sahoo

Yee

2010

J. High Energ. Phys.

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We study the ground state of baryonic/axial matter at zero temperature chiral-symmetry broken phase under a large magnetic field, in the framework of holographic QCD by SakaiSugimoto. Our study is motivated by a recent proposal of chiral magnetic spiral phase that has been argued to be favored against previously studied phase of homogeneous distribution of axial/baryonic currents in terms of meson super-currents dictated by triangle anomalies in QCD.Our results provide an existence proof of chiral magnetic spiral in strong coupling regime via holography, at least for large axial chemical potentials, whereas we don't find the phenomenon in the case of purely baryonic chemical potential.

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“…These values suggest that the kaons are condensed and thus that the relevant phase to consider is the CFL-K 0 phase. It has been argued that for sufficiently large values of the parameter m 2 s /µ q the CFL-K 0 phase is modified to the so-called curCFL-K 0 phase which is anisotropic and exhibits counter-propagating currents from the kaon condensate and ungapped fermions [43,44,45]. Because of the presence of ungapped fermions, the transport properties of this phase can be expected to be very different from the ones in the CFL-K 0 phase and similar to unpaired quark matter.…”

Section: A Chiral Lagrangianmentioning

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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Goldstone boson currents in a kaon condensed color-flavor locked phase

Cited by 20 publications

References 31 publications

Nambu–Jona-Lasinio model of homogeneous neutral quark matter: Pseudoscalar diquark condensates revisited

Nambu–Jona-Lasinio model of homogeneous neutral quark matter: Pseudoscalar diquark condensates revisited

Holographic chiral magnetic spiral

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

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