An apparent GRBs evolution around us or a sampling of thin GRB beaming jets?

TL;DR

This paper proposes that the apparent evolution of gamma-ray bursts (GRBs) can be explained by a model of very thin, precessing, and spinning jets originating from pulsars or micro-quasars, rather than true cosmological evolution.

Contribution

It introduces a thin jet precession model to explain GRB observations, challenging the need for GRB evolution and linking observed properties to jet geometry and dynamics.

Findings

The model explains the erratic structure and re-brightening of GRBs.

It accounts for the correlation between brightness and hardness (Amati correlation).

It suggests GeV gamma emissions may be from PeV neutron decay in jets.

Abstract

The gamma ray burst apparent average isotropic power versus their red-shift of all known GRB (Sept.2009) is reported. It calls for an unrealistic Gamma Ray Burst Evolution around us or it just probe the need of a very thin gamma precession-jet model. These precessing and spinning jet are originated by Inverse Compton and-or Synchrotron Radiation at pulsars or micro-quasars sources, by ultra-relativistic electrons. These Jets are most powerful at Supernova birth, blazing, once on axis, to us and flashing GRB detector. The trembling of the thin jet (spinning, precessing, bent by magnetic fields) explains naturally the observed erratic multi-explosive structure of different GRBs and its rare re-brightening. The jets are precessing (by binary companion or inner disk asymmetry) and decaying by power law on time scales to a few hours. GRB blazing occurs inside the observer cone of view only a seconds duration times; because relativistic synchrotron (or IC) laws the jet angle is thinner in gamma but wider in X band. Its apparent brightening is so well correlated with its hardness (The Amati correlation). This explain the wider and longer X GRB afterglow duration and the (not so much) rare presence of X-ray precursors well before the apparent main GRB explosion. The jet lepton maybe originated by an inner primary hadron core (as well as pions and muons secondary Jets). The EGRET, AGILE and Fermi few hardest and late GeV gamma might be PeV neutron beta decay in flight observed in-axis under a relativistic shrinkage.