Shear viscosity in antikaon condensed matter
Rana Nandi, Sarmistha Banik, and Debades Bandyopadhyay
TL;DR
This paper studies how the presence of an antikaon condensate in neutron star matter affects shear viscosity, revealing reductions in lepton viscosities and increased proton collision contributions.
Contribution
It provides the first detailed analysis of shear viscosity modifications due to antikaon condensation in neutron star matter.
Findings
Lepton shear viscosities decrease with antikaon condensate.
Proton-proton collision contributions become significant.
Proton shear viscosity becomes comparable to neutron shear viscosity.
Abstract
We investigate the shear viscosity of neutron star matter in the presence of an antikaon condensate. The electron and muon number densities are reduced due to the appearance of a condensate in neutron star matter, whereas the proton number density increases. Consequently the shear viscosity due to scatterings of electrons and muons with themselves and protons is lowered compared to the case without the condensate. On the other hand, the contribution of proton-proton collisions to the proton shear viscosity through electromagnetic and strong interactions, becomes important and comparable to the neutron shear viscosity.
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