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- W2912061757 abstract "Several phenomena occurring in neutron stars are affected by the elementary excitations that characterize the stellar matter. In particular, low-energy excitations can play a major role in the emission and propagation of neutrinos, neutron star cooling, and transport processes. In this paper, we consider the elementary modes in the star region where both proton and neutron components are superfluid. We study the overall spectral functions of protons, neutrons, and electrons on the basis of the Coulomb and nuclear interactions. This paper is performed in the framework of the random-phase approximation, generalized to superfluid systems. The formalism we use ensures that the generalized Ward's identities are satisfied. We focus on the coupling between neutrons and protons. On one hand, this coupling results in collective modes that involve simultaneously neutrons and protons; on the other hand, it produces a damping of the excitations. Both effects are especially visible in the spectral functions of the different components of the matter. At high densities while the neutrons and protons tend to develop independent excitations as indicated by the spectral functions, the neutron-proton coupling still produces a strong damping of the modes." @default.
- W2912061757 created "2019-02-21" @default.
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- W2912061757 date "2019-02-04" @default.
- W2912061757 modified "2023-10-14" @default.
- W2912061757 title "Coupling between superfluid neutrons and superfluid protons in the elementary excitations of neutron star matter" @default.
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- W2912061757 doi "https://doi.org/10.1103/physrevc.99.025801" @default.
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