Bulk viscosity in 2SC and CFL quark matter

Journal Article · Mon Nov 19 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2823860· OSTI ID:21049393

Alford, Mark G; Schmitt, Andreas ^[1]

---

1. Department of Physics, Washington University St Louis, MO, 63130 (United States)

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{r_reversible}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 > or approx. 1 MeV for CFL, T > or approx. 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.

• OSTI ID: 21049393
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 964; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLOR MODEL
DAMPING
FERMIONS
FLAVOR MODEL
KAONS
MEV RANGE
QUANTUM CHROMODYNAMICS
QUARK MATTER
SHEAR
SUPERCONDUCTIVITY
SUPERFLUIDITY
VISCOSITY