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Bulk viscosity in a cold CFL superfluid



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Llanes Estrada, Felipe José and Manuel, Cristina (2007) Bulk viscosity in a cold CFL superfluid. Journal of Cosmology and Astroparticle Physics (8). ISSN 1475-7516

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Official URL: http://dx.doi.org/10.1088/1475-7516/2007/08/001


We compute one of the bulk viscosity coeffcients of cold color -flavor locked ( CFL) quark matter in the temperature regime where the contribution of mesons, quarks and gluons to transport phenomena is Boltzmann suppressed. In that regime dissipation occurs due to collisions of super fluid phonons, the Goldstone modes associated to the spontaneous breaking of baryon symmetry. We first review the hydrodynamics of relativistic superfluids, and recall that there are at least three bulk viscosity coeffcients in these systems. We then compute the bulk viscosity coeffcient associated to the normal fluid component of the superfluid. In our analysis we use Son's effective field theory for the superfluid phonon, amended to include scale breaking effects proportional to the square of the strange quark mass m(s). We compute the bulk viscosity at leading order in the scale breaking parameter, and find that it is dominated by collinear splitting and joining processes. The resulting transport coeffcient is zeta = 0.011 m(s)(4)/T, growing at low temperature T until the phonon fluid description stops making sense. Our results are relevant for studying the rotational properties of a compact star formed by CFL quark matter.

Item Type:Article
Additional Information:

© 2007 IOP Publishing Ltd and SISSA.
We thank M Alford, A Dobado, L Garay, M Mannarelli, G Moore and D T Son for useful discussions and remarks. Our work has been supported by the grants FPA 2004-02602, 2005 02327, PR27/05-13955-BSCH and AYA 2005-08013-C03-02.

Uncontrolled Keywords:Strange Quark Matter, Stars, Density, Qcd, Hydrodynamics, Dynamics, Systems, Pulsars, Modes
Subjects:Sciences > Physics
ID Code:23060
Deposited On:10 Oct 2013 17:57
Last Modified:31 Dec 2020 00:01

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