RT Journal Article
T1 Shear viscosity in a CFL quark star
A1 Manuel, Cristina
A1 Dobado González, Antonio
A1 Llanes Estrada, Felipe José
AB We compute the mean free path and shear viscosity in the color-flavor locked (CFL) phase of dense quark matter at low temperature T, when the contributions of mesons, quarks and gluons to the transport coefficients are Boltzmann suppressed. CFL quark matter displays superfluid properties, and transport phenomena in such cold regime are dominated by phonon-phonon scattering. We study superfluid phonons within thermal field theory and compute the mean free path associated to their most relevant collision processes. Small-angle processes turn out to be more efficient in slowing transport phenomena in the CFL matter, while the mean free path relevant for the shear viscosity is less sensitive to collinear scattering due to the presence of zero modes in the Boltzmann equation. In analogy with superfluid He-4, we find the same T power law for the superfluid phonon damping rate and mean free path. Our results are relevant for the study of rotational properties of compact stars, and correct wrong estimates existing in the literature.
PB Int School Advanced Studies
SN 1126-6708
YR 2005
FD 2005-09
LK https://hdl.handle.net/20.500.14352/50732
UL https://hdl.handle.net/20.500.14352/50732
LA eng
NO © SISSA 2005We thank D.T. Son, R. Pisarski and L. Yaffe for very useful discussions. C.M. thanks the I.N.T. at the University of Washington for its hospitality and partial support during the completion of this article. This work has been supported by grants FPA 2000-0956, BFM 2002-01003, FPA2001-3031 from MCYT (Spain)
NO MCYT (Spain)
DS Docta Complutense
RD 7 abr 2025