publication . Preprint . 1997

Photon Dispersion in a Supernova Core

Kopf, A.; Raffelt, G.;
Open Access English
  • Published: 18 Nov 1997
Abstract
While the photon forward-scattering amplitude on free magnetic dipoles (e.g. free neutrons) vanishes, the nucleon magnetic moments still contribute significantly to the photon dispersion relation in a supernova (SN) core where the nucleon spins are not free due to their interaction. We study the frequency dependence of the relevant spin susceptibility in a toy model with only neutrons which interact by one-pion exchange. Our approach amounts to calculating the photon absorption rate from the inverse bremsstrahlung process gamma n n --> n n, and then deriving the refractive index n_refr with the help of the Kramers-Kronig relation. In the static limit (omega --> ...
Subjects
free text keywords: High Energy Physics - Phenomenology, Astrophysics
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FIG. 1. The function s(x) as defined in Eq. (28). The

analytic approximation Eq. (29) is identical to within plotting

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