Magnetic color flavor locking phase in high density QCD

Mar, 2005
4 pages
Published in:
  • Phys.Rev.Lett. 95 (2005) 152002
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Abstract:
We investigate the effects of an external magnetic field in the gap structure of a color superconductor with three massless quark flavors. Using an effective theory with four-fermion interactions, inspired by one-gluon exchange, we show that the long-range component Bundefined\widetilde{B} of the external magnetic field that penetrates the color-flavor locked (CFL) phase modifies its gap structure, producing a new phase of lower symmetry. A main outcome of our study is that the Bundefined\widetilde{B} field tends to strengthen the gaps formed by Qundefined\widetilde{Q}-charged and Qundefined\widetilde{Q}-neutral quarks that coupled among themselves through tree-level vertices. These gaps are enhanced by the field-dependent density of states of the Qundefined\widetilde{Q}-charged quarks on the Fermi surface. Our considerations are relevant for the study of highly magnetized compact stars.
  • 24.85.+p
  • 12.38.Aw
  • quantum chromodynamics
  • quark matter
  • Fermi surface
  • color flavor locked phase
  • superconductivity: color
  • superconductivity: gap
  • flavor: 3
  • magnetic field: external field