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Cherenkov radiation by massless neutrinos in a magnetic field
Ara N. Ioannisian, Georg G. Raffelt
We calculate the Cherenkov process nu -> nu+photon in the presence of a homogeneous magnetic field. The neutrinos are taken to be massless with only standard-model couplings. The m…
Reduction of Weak Interaction Rates in Neutron Stars by Nucleon Spin Fluctuations: Degenerate Case
Georg Raffelt, Thomas Strobel
Nucleon spin fluctuations in a dense medium reduce the ``naive'' values of weak interaction rates (neutrino opacities, neutrino emissivities). We extend previous studies of this ef…
Supernova Neutrino Opacities
Georg G. Raffelt
In a supernova (SN) core during infall and after collapse, neutrinos are trapped by their interactions with nucleons. For the axial-vector current interactions it is not enough to…
SN 1987A Gamma-Ray Limits on the Conversion of Pseudoscalars
J. W. Brockway, E. D. Carlson, G. G. Raffelt
Pseudoscalar particles usually couple electromagnetically by an interaction of the form $\frc14 g ϕF {\widetilde F}$, allowing them to convert to photons in the presence of mag…
Neutrino Dispersion in Magnetized Media and Spin Oscillations in the Early Universe
Per Elmfors, Dario Grasso, Georg Raffelt
We derive general expressions for the neutrino dispersion relation in a magnetized plasma with a wide range of temperatures, chemical potentials, and magnetic field strengths. If t…
Supernova Neutrino Scattering Rates Reduced by Nucleon Spin Fluctuations: Perturbative Limit
G. Raffelt, D. Seckel, G. Sigl
In a nuclear medium, spin-dependent forces cause the nucleon spins to fluctuate with a rate . We have previously shown that as a consequence the effective axial-current neutri…