ar X iv : a st ro - p h / 01 03 13 7 8 M ar 2 00 1 Primordial black holes and the Asymmetrical Distribution of Short GRB Events
نویسنده
چکیده
We review some of the expectations for Primordial Black Hole evaporation and we review the properties of short Gamma Ray Bursts. It is plausible that these GRB come from PBH evaporation. We then show that the angular distribution asymmetry recently observed by us could be due to a concentration of PBH in the Galactic Arms like the Orion arm.
منابع مشابه
ar X iv : a st ro - p h / 00 03 06 2 v 1 5 M ar 2 00 0 1 Primordial black holes , phase transitions , and the fate of the universe ∗
Phase transitions in the early universe are prime settings for the production of primordial black holes, since they can break the relatively quiescent homogeneity and isotropy of Friedmann–Robertson–Walker (FRW) cosmologies. These epochs of “symmetry breaking,” moreover, can affect the subsequent development of spacetime by changing the evolution of some FRW parameters, including the present ag...
متن کاملar X iv : a st ro - p h / 01 03 43 8 v 1 2 7 M ar 2 00 1 X - rays and accretion discs as probes of the strong gravity of black holes
The observations and interpretation of broad iron lines in the X-ray spectra of Seyfert 1 galaxies are reviewed. The line profiles observed from MCG–6-30-15 and NGC 3516 show extended red wings to the line explained by large gravitational red-shifts. The results are consistent with the emission expected from an X-ray irradiated flat accretion disc orbiting very close to a black hole. Results fr...
متن کاملar X iv : a st ro - p h / 01 03 31 9 v 1 2 0 M ar 2 00 1 Gamma Ray Bursts statistical properties and limitations on the physical model
The present common view about GRB origin is related to cosmology. There are two evidences in favour of this interpretation. The first is connected with statistics, the second is based on measurements of the redshifts in the GRB optical afterglows. Red shifts in optical afterglows had been observed only in long GRB. Statistical errors, and possibility of galactic origin of short GRB is discussed...
متن کاملar X iv : a st ro - p h / 01 03 44 4 v 1 2 7 M ar 2 00 1 From Centimeter to Millimeter Wavelengths : A High Angular Resolution Study of 3 C 273
We monitored 3C 273 with VLBI at 15–86 GHz since 1990. We discuss component trajectories, opacity effects, a rotating jet, and outburst-ejection relations from Gamma-ray to radio bands.
متن کاملar X iv : a st ro - p h / 01 03 13 8 8 M ar 2 00 1 Supernova II Neutrino Bursts and Neutrino Massive Mixing
We describe the Neutrino Spectrum and detection for SN II sources. We discuss the effects of neutrino mixing in the SN II. A new analysis of SN1987A is described. We discuss the possible detection of the diffuse relic SN II flux. Finally we discuss a new detection concept, OMNIS, for and and detection and compare with μ 2 other present and future SN detectors.
متن کامل