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- W2067998753 abstract "It has recently been argued that long range forces due to the exchange of massless neutrinos give rise to a very large self-energy in a dense, finite-ranged, weakly charged medium. Such an effect, if real, would destabilize a neutron star. To address this issue we have studied the related problem of a massless neutrino field in the presence of an external, static electroweak potential of finite range. To be precise, we have computed to one loop the exact vacuum energy for the case of a spherical square well potential of depth ensuremath{alpha} and radius $R.$ For small wells, the vacuum energy is reliably determined by a perturbative expansion in the external potential. For large wells, however, the perturbative expansion breaks down. A manifestation of this breakdown is that the vacuum carries a non-zero neutrino charge. The energy and neutrino charge of the ground state are, to a good approximation for large wells, those of a neutrino condensate with chemical potential $ensuremath{mu}=ensuremath{alpha}.$ Our results demonstrate explicitly that long-range forces due to the exchange of massless neutrinos do not threaten the stability of neutron stars." @default.
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- W2067998753 date "1998-05-15" @default.
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- W2067998753 title "Neutrino ground state in a dense star" @default.
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- W2067998753 doi "https://doi.org/10.1103/physrevd.57.5970" @default.
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