Evidence of Deterministic Components in the Apparent Randomness of GRBs: Clues of a Chaotic Dynamic

Details Evidence of Deterministic Components in the Apparent Randomness of GRBs: Clues of a Chaotic Dynamic Evidence of Deterministic Components in the Apparent Randomness of GRBs: Clues of a Chaotic Dynamic

2011-09-27

arxiv.org/abs/1109.5891v1

The article is published by Scientific Report. The original version is available at the following address: http://www.nature

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

13 pages, 6 figures

Scientific paper

Prompt {\gamma}-ray emissions from gamma-ray bursts (GRBs) exhibit a vast range of extremely complex temporal structures with a typical variability time-scale significantly short - as fast as milliseconds. This work aims to investigate the apparent randomness of the GRB time profiles making extensive use of nonlinear techniques combining the advanced spectral method of the Singular Spectrum Analysis (SSA) with the classical tools provided by the Chaos Theory. Despite their morphological complexity, we detect evidence of a non stochastic short-term variability during the overall burst duration - seemingly consistent with a chaotic behavior. The phase space portrait of such variability shows the existence of a well-defined strange attractor underlying the erratic prompt emission structures. This scenario can shed new light on the ultra-relativistic processes believed to take place in GRB explosions and usually associated with the birth of a fast-spinning magnetar or accretion of matter onto a newly formed black hole.

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