Coherent neutrino radiation in supernovae at two loops

Details Coherent neutrino radiation in supernovae at two loops Coherent neutrino radiation in supernovae at two loops

2000-02-10

arxiv.org/abs/astro-ph/0002228v2

Phys.Rev. D62 (2000) 083002

Astronomy and Astrophysics

Astrophysics

26 pages, 5 figures, uses Revtex

Scientific paper

10.1103/PhysRevD.62.083002

We develop a neutrino transport theory, in terms of the real-time non-equilibrium Green's functions, which is applicable to physical conditions arbitrary far from thermal equilibrium. We compute the coherent neutrino radiation in cores of supernovae by evaluating the two-particle-two-hole (2p-2h) polarization function with dressed propagators. The propagator dressing is carried out in the particle-particle channel to all orders in the interaction. We show that at two loops there are two distinct sources of coherence effects in the bremsstrahlung. One is the generically off-shell intermediate state propagation, which leads to the Landau-Pomeranchuk-Migdal type suppression of radiation. We extend previous perturbative results, obtained in the leading order in quasiparticle width, by deriving the exact non-perturbative expression. A new contribution due to off-shell finial/initial baryon states is treated in the leading order in the quasiparticle width. The latter contribution corresponds to processes of higher order than second order in the virial expansion in the number of quasiparticles. At 2p-2h level, the time component of the polarization tensor for the vector transitions vanishes identically in the soft neutrino limit. Vector current thereby is conserved. The contraction of the neutral axial vector current with tensor interaction among the baryons leads to a non-vanishing contribution to the bremsstrahlung rate. These rates are evaluated numerically for finite temperature pure neutron matter at and above the nuclear saturation density.

Affiliated with

Also associated with

No associations

Rating

Coherent neutrino radiation in supernovae at two loops does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coherent neutrino radiation in supernovae at two loops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent neutrino radiation in supernovae at two loops will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-445682