3 research outputs found
MeV neutrinos in double beta decay
The effect of Majorana neutrinos in the MeV mass range on the double beta
decay of various isotopes is studied on pure phenomenological arguments. By
using only experimental half life data, limits on the mixing parameter
of the order 10 can be derived. Also the possible
achievements of upcoming experiments and some consequences are outlined.Comment: 7 pages, 6 uudecoded EPS-figure
Scalar cosmological perturbations from inflationary black holes
We study the correction to the scale invariant power spectrum of a scalar
field on de Sitter space from small black holes that formed during a
pre-inflationary matter dominated era. The formation probability of such black
holes is estimated from primordial Gaussian density fluctuations. We determine
the correction to the spectrum by first deriving the Keldysh propagator for a
massless scalar field on Schwarzschild-de Sitter space. Our results suggest
that the effect is strong enough to be tested -- and possibly even ruled out --
by observations.Comment: 41 pages, 11 figures, published versio