Bulk viscosity in 2SC and CFL quark matter

Details Bulk viscosity in 2SC and CFL quark matter Bulk viscosity in 2SC and CFL quark matter

2007-09-26

arxiv.org/abs/0709.4251v1

AIPConf.Proc.964:256-263,2007

Physics

Nuclear Physics

Nuclear Theory

8 pages, 3 figures, contribution to the proceedings of QCD@Work 2007, Martina Franca (Italy)

Scientific paper

10.1063/1.2823860

The bulk viscosities of two color-superconducting phases, the color-flavor locked (CFL) phase and the 2SC phase, are computed and compared to the result for unpaired quark matter. In the case of the CFL phase, processes involving kaons and the superfluid mode give the largest contribution to the bulk viscosity since all fermionic modes are gapped. In the case of the 2SC phase, ungapped fermionic modes are present and the process u+d <-> u+s provides the dominant contribution. In both cases, the bulk viscosity can become larger than that of the unpaired phase for sufficiently large temperatures (T >~ 1 MeV for CFL, T >~ 0.1 MeV for 2SC). Bulk viscosity (as well as shear viscosity) is important for the damping of r-modes in compact stars and thus can potentially be used as an indirect signal for the presence or absence of color-superconducting quark matter.

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