Are electron stars possible if they have a dark matter 'core' What would their properties be General Discussion. As its name indicates, this material doesnt emit much light at least, not as much light per kilogram as stars do. The Crab Nebula is the leftover, or remnant, of a massive star in our Milky Way that died 6,500 light-years away. Dark Matter Halo We also believe that our galaxy is surrounded by an enormous spherical cloud of dark matter: material which is not composed of ordinary protons, electrons and neutrons, but of some other sort of elementary particles. A supernova of a star more than about 10 times the size of our sun may leave behind the densest objects in the universe black holes. They are presented in the form valid for any equation of state of nucleon dense matter. Are electron stars possible if they have a dark matter 'core' What would their properties be General Discussion. Usually a very dense core is left behind, along with an expanding cloud of hot gas called a nebula. Switching off direct Urca processes with decreasing density in a nonsuperfluid matter lowers the bulk viscosity by 3-5 orders of magnitude. We calculate the shear viscosity $\eta = \eta_$, can be important, and both are calculated including the effects of proton superfluidity. Dark matter not at the core of neutron stars Difference in measured half-life of neutrons probably not due to dark matter. In combination with the results of our previous paper on the bulk viscosity due to direct Urca processes, a realistic description of the bulk viscosity in superfluid neutron star cores is obtained.
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