ar X iv : a st ro - p h / 99 06 24 1 v 1 1 4 Ju n 19 99 Evidence Against the Sciama Model of Radiative Decay of Massive Neutrinos

ar X iv : a st ro - p h / 99 06 25 1 v 1 1 5 Ju n 19 99 Inflow and outflows in NGC 2992 / 3

We present observational evidences for inflow and outflows in the interacting system Arp 245 (NGC 2992/3).

ar X iv : h ep - p h / 01 06 19 6 v 1 1 8 Ju n 20 01 NEUTRINO SCATTERING IN A MAGNETIC FIELD

Motivated by the evidence for a finite neutrino mass we examine anew the interaction of neutrinos in a magnetic field. We present the rate for radiative scattering for both massless and massive neutrinos in the standard model and give the corresponding numerical estimates. We also consider the effects arising from a possible neutrino magnetic moment.

ar X iv : h ep - p h / 99 06 38 1 v 1 1 6 Ju n 19 99 Nature of neutrinos in the light of present and future experiments

Two general models with hierarchical and almost degenerate neutrino masses, which are able to explain the solar and atmospheric anomalies are investigated. We show how neutrinoless double beta decay experiments discern Dirac and Majorana natures of neutrinos. The strongest result is, that almost degenerate neutrinos with masses above 0.22 eV combined with the SMA MSW must be Dirac particles. In...

ar X iv : a st ro - p h / 99 02 06 2 v 1 4 F eb 1 99 9 SOURCES OF RELATIVISTIC JETS IN THE GALAXY

ar X iv : a st ro - p h / 99 06 50 0 v 1 3 0 Ju n 19 99 Turbulent Particle Acceleration in the Diffuse Cluster Plasma

In situ particle acceleration is probably occur-ing in cluster radio haloes. This is suggested by the uniformity and extent of the haloes, given that spatial diffusion is slow and that radiative losses limit particle lifetimes. Stochastic acceleration by plasma turbulence is the most likely mechanism. Alfven wave turbulence has been suggested as the means of acceleration, but it is too slow to ...