Secondary pairing in gapless colour-superconducting quark matter

Alford, Mark; Wang, Qinghai

doi:10.1088/0954-3899/32/2/001

Cited by 13 publications

(5 citation statements)

References 14 publications

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“…Since in real systems it can be controlled by external pressure it is a useful parameter to investigate the effects of Fermi surface mismatch in multi-band superconductors. Our mean-field approach is more appropriate to treat weak coupling systems with g, g b ∼ 1, although even in this case it can miss effects due to fluctuations, as an additional p-wave instability [21]. In the metallic problem, the quasi-particles have spins as extra degrees of freedom and in principle there is the possibility of an additional s-wave pairing between quasi-particles at the gapless Fermi surfaces.…”

Section: Discussionmentioning

confidence: 99%

Asymmetric superconductivity in metallic systems

Continentino¹,

Padilha²

2008

J. Phys.: Condens. Matter

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Different types of superfluid ground states have been investigated in systems of two species of fermions with Fermi surfaces that do not match. This study is relevant for cold atomic systems, condensed matter physics and quark matter. In this paper we consider this problem in the case the fermionic quasi-particles can transmute into one another and only their total number is conserved. We use a BCS approximation to study superconductivity in two-band metallic systems with inter and intra-band interactions. Tuning the hybridization between the bands varies the mismatch of the Fermi surfaces and produces different instabilities. For inter-band attractive interactions we find a first order normal-superconductor and a homogeneous metastable phase with gapless excitations. In the case of intra-band interactions, the transition from the superconductor to the normal state as hybridization increases is continuous and associated with a quantum critical point. The case when both interactions are present is also considered.

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Section: Discussionmentioning

confidence: 99%

Asymmetric superconductivity in metallic systems

Continentino¹,

Padilha²

2008

J. Phys.: Condens. Matter

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“…This solution represents one of the few cases in which the instability may be cured by means of a different homogeneous condensate. However, the secondary gap turns out to be extremely small and at temperatures typical of CSOs it is not able to fix the chromomagnetic instability (Alford and Wang, 2006).…”

Section: Contentsmentioning

confidence: 99%

Crystalline color superconductors

et al. 2014

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Inhomogeneous superconductors and inhomogeneous superfluids appear in a variety of contexts including quark matter at extreme densities, fermionic systems of cold atoms, type-II cuprates, and organic superconductors. In the present review the focus is on properties of quark matter at high baryonic density, which may exist in the interior of compact stars. The conditions realized in these stellar objects tend to disfavor standard symmetric BCS pairing and may favor an inhomogeneous color superconducting phase. The properties of inhomogeneous color superconductors are discussed in detail and in particular of crystalline color superconductors. The possible astrophysical signatures associated with the presence of crystalline color superconducting phases within the core of compact stars are also reviewed.Comment: Added 3 figures, added section II F, added section with conclusions. Several references added. Improved the quality of the presentation and removed various typos. Almost matches the version accepted for publication of Reviews of Modern Physic

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“…• Secondary pairing. The gapless modes could form a secondary gap, but here too the gap is far too small 28,29 . • Mixed phases.…”

Section: Possible Solutions Of the Problem Of The Chromagnetic Instabmentioning

confidence: 99%