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Phys. Rev. Lett. 81, 53–56 (1998)

Diquark Bose Condensates in High Density Matter and Instantons

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R. Rapp1, T. Schäfer2, E. Shuryak1, and M. Velkovsky3
1Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800
2Institute for Nuclear Theory, Department of Physics, University of Washington, Seattle, Washington 98195
3Nuclear Theory Group, Brookhaven National Laboratory, Upton, New York 11973-5000

Received 19 December 1997; published in the issue dated 6 July 1998

Instantons lead to strong correlations between up and down quarks with spin zero and antisymmetric color wave functions. In cold and dense matter, nb>nc≃1fm-3 and T<Tc∼50 MeV, these pairs Bose condense, replacing the usual 〈q̅ q〉 condensate and restoring chiral symmetry. At high density, the ground state is a color superconductor in which diquarks play the role of Cooper pairs. An interesting toy model is provided by QCD with two colors: it has a particle-antiparticle symmetry which relates 〈q̅ q〉 and 〈qq〉 condensates.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.53
DOI:
10.1103/PhysRevLett.81.53
PACS:
12.38.Mh, 12.38.Lg, 21.65.+f
 
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