Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-12-10
Phys.Rev.D52:1780-1799,1995
Astronomy and Astrophysics
Astrophysics
33 pages, Tex
Scientific paper
10.1103/PhysRevD.52.1780
The problem of neutral-current processes (neutrino scattering, pair emission, pair absorption, axion emission, \etc) in a nuclear medium can be separated into an expression representing the phase space of the weakly interacting probe, and a set of dynamic structure functions of the medium. For a non-relativistic medium we reduce the description to two structure functions $S_A(\o)$ and $S_V(\o)$ of the energy transfer, representing the axial-vector and vector interactions. $S_V$ is well determined by the single-nucleon approximation while $S_A$ may be dominated by multiply interacting nucleons. Unless the shape of $S_A(\o)$ changes dramatically at high densities, scattering processes always dominate over pair processes for neutrino transport or the emission of right-handed states. Because the emission of right-handed neutrinos and axions is controlled by the same medium response functions, a consistent constraint on their properties from consideration of supernova cooling should use the same structure functions for both neutrino transport and exotic cooling mechanisms.
Raffelt Georg
Seckel David
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