Stars as Laboratories for Fundamental Physics - MPP Theory Group

478 Chapter 12
Fig. 12.16. Different regimes of neutrino masses and total lifetimes referred
to in the text. ∆t γ is the duration of the burst of decay photons. The
radiative lifetime limits in the areas 1−6 are summarized in Tab. 12.2.
Fig. 12.17. Upper limits on effective neutrino transition moments from
SN 1987A as given in Tab. 12.2. The contours are marked with log(µ eff /µ B ).
In the shaded lower right region the neutrinos decay within the progenitor.
Toward the lower left side the bounds are not self-consistent because large
dipole moments induce large nonstandard scattering cross sections which
enhance neutrino trapping.
The discussion of the previous sections focussed on standard neutrinos
which are emitted approximately with the same efficiency and
similar energies as ν e ’s and ν e ’s. It is possible, however, that these neu-