Plasmon excitations in homogeneous neutron-star matter |
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Authors: | M Baldo and C Ducoin |
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Institution: | (1) Dipartimento di Fisica, Università di Catania, Catania, Italy;(2) INFN, Sezione di Catania, Catania, Italy |
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Abstract: | We study the possible collective plasma modes which can affect neutron-star thermodynamics and different elementary processes
in the baryonic density range between nuclear saturation ρ
0 and 3ρ
0. In this region, the expected constituents of neutron-star matter are mainly neutrons, protons, electrons, and muons (npeμ matter), under the constraint of beta equilibrium. The elementary plasma excitations of the peμ three-fluid medium are studied in the RPA framework. We emphasize the relevance of the Coulomb interaction among the three
species, in particular, the interplay of the electron and muon screening in suppressing the possible proton plasma mode, which
is converted into a sound-like mode. The Coulomb interaction alone is able to produce a variety of excitation branches and
the full spectral function shows a rich structure at different energy. The genuine plasmon mode is pushed at high energy and
it contains mainly an electron component with a substantial muon component, which increases with density. The plasmon is undamped
for not too large momentum and is expected to be hardly affected by the nuclear interaction. All the other branches, which
fall below the plasmon, are damped or over-damped.
The text was submitted by the authors in English. |
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