English

Viscosity bound for anisotropic superfluids with dark matter sector

High Energy Physics - Theory 2017-07-26 v3 Superconductivity General Relativity and Quantum Cosmology

Abstract

The shear viscosity to the entropy density ratio η/s\eta/s of the anisotropic superfluid has been calculated by means of the gauge/gravity duality in the presence of the {\it dark matter} sector. The {\it dark matter} has been described by the Yang-Mills field analogous to the one describing visible matter sector and it is assumed to interact with the visible field with coupling constant α\alpha. Close to the superfluid transition temperature (TcT_c) the analytical solution has been given up to the leading order in a symmetry breaking parameter and the ratio of the gravitational constant and Yang-Mils coupling. The tensor element of ratio η/s\eta/s remains unaffected by the {\it dark matter} for the viscosity tensor in the plane perpendicular to the symmetry breaking direction (here yzyz). The temperature dependence and the linear correction in (1α)(1-\alpha) in the plane containing this direction (here xyxy) was also revealed. The correction linearly vanishes for temperature tending to the critical one TTcT\rightarrow T_c.

Keywords

Cite

@article{arxiv.1612.02593,
  title  = {Viscosity bound for anisotropic superfluids with dark matter sector},
  author = {Marek Rogatko and Karol I. Wysokinski},
  journal= {arXiv preprint arXiv:1612.02593},
  year   = {2017}
}

Comments

14 pages, some comments and references added

R2 v1 2026-06-22T17:17:18.155Z