[SEMINARI]: Dra. Mornas: Neutrino-nucleon scattering rate in the relativistic random phase

[Arcadi Santamaria]

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                              S E M I N A R I

             [Image]   Departament de Física Teòrica    [Image]
                          Universitat de València
                       Institut de Física Corpuscular
                       Universitat de València - CSIC

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        Neutrino-nucleon scattering rate in the relativistic random phase
                                  approximation

                               Lysiane Mornas

                           (Universidad de Oviedo)

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                     Aula de Seminaris de Física Teòrica
                 Thursday 04 of October of 2001 at 12:30 PM
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                                    Resum

  We calculate the in-medium modification to neutrino-nucleon scattering in
      the relativistic random phase approximation in the framework of a
   relativistic hadronic field theory with sigma, omega, pi, rho and delta
      mesons exchange. In view of applications to neutrino transport in
   protoneutron stars, we study the evolution of the neutrino opacity as a
function of density, asymmetry and temperature Special attention was paid to
 the issues of renormalization of vacuum fluctuations, short range residual
   interaction and meson mixing. In contrast to previous work where strong
 reduction factors were predicted, RPA corrections with respect to the mean
 field approximation amounting to only 10% to 15% at high density were found
 in this work. When meson mixing is fully taken into account, the reduction
                    factor is found to be even smaller.

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