PMID: 15245214Jul 13, 2004Paper

Gapless color-flavor-locked quark matter

Physical Review Letters
Mark G AlfordKrishna Rajagopal

Abstract

In neutral cold quark matter that is so dense that the strange quark mass Ms is unimportant, all three quark flavors pair in a color-flavor locked (CFL) pattern, and all nine fermionic quasiparticles have a gap Delta (or 2Delta). We argue that, as the density decreases (or Ms increases), there is a quantum phase transition (at M(2s/mu approximately 2Delta) to a new "gapless CFL phase" in which only seven quasiparticles have a gap. There is still an unbroken U(1)(Q) gluon/photon, but, unlike CFL, gapless CFL is a Q conductor with gapless (charged) quasiquarks and a nonzero electron density at zero temperature, so its low energy effective theory and astrophysical properties are qualitatively new. At the transition, the dispersion relations of both gapless quasiparticles are quadratic, but for larger M2s/mu, one becomes conventionally linear while the other remains quadratic, up to tiny corrections.

References

Oct 4, 2000·Physical Review Letters·M AlfordK Rajagopal
May 1, 2001·Physical Review Letters·K Rajagopal, F Wilczek
Aug 9, 2003·Physical Review Letters·Elena GubankovaFrank Wilczek

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Citations

Oct 10, 2006·Physical Review Letters·Efrain J Ferrer, Vivian de la Incera
Feb 9, 2005·Physical Review Letters·Michael McNeil ForbesFrank Wilczek
Feb 21, 2006·Physical Review Letters·T Schäfer
Aug 11, 2005·Physical Review Letters·Andreas SchmittQun Wang
Aug 11, 2005·Physical Review Letters·J Carlson, Sanjay Reddy
Nov 5, 2004·Physical Review Letters·K IidaT Hatsuda

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