5 papers
Is the diffuse gamma background radiation generated by galactic cosmic rays?
Arnon Dar, A. De Rújula
We explore the possibility that the diffuse gamma-ray background radiation (GBR) at high galactic latitudes could be dominated by inverse Compton scattering of cosmic ray (CR) elec…
Will relativistic heavy-ion colliders destroy our planet?
Arnon Dar, A. De Rújula, Ulrich Heinz
Experiments at the Brookhaven National Laboratory will study collisions between gold nuclei at unprecedented energies. The concern has been voiced that ``strangelets''-hypothetical…
Galactic gamma-ray bursters - an alternative source of cosmic rays at all energies
A. Dar, R. Plaga
We propose a new hypothesis for the origin of the major part of non-solar hadronic cosmic rays (CRs) at all energies: highly relativistic, narrowly collimated jets from the birth o…
On The Origin of Gamma Ray Bursts
Nir J. Shaviv, Arnon Dar
We propose that repeated photoexcitation/ionization of high Z atoms of highly relativistic flows by star light in dense stellar regions followed by emission of decay/recombination…
ORIGIN OF THE HIGH ENERGY EXTRAGALACTIC DIFFUSE GAMMA RAY BACKGROUND
Arnon Dar, Nir J. Shaviv
We show that cosmic rays in external galaxies, groups and clusters rich in gas, with an average flux similar to that observed in the Milky Way, could have produced the observed ext…