Non-extensivity Effects and the Highest Energy Cosmic Ray Affair

Details Non-extensivity Effects and the Highest Energy Cosmic Ray Affair Non-extensivity Effects and the Highest Energy Cosmic Ray Affair

2000-09-13

arxiv.org/abs/cond-mat/0009199v2

Phys.Lett. A283 (2001) 319-322

Physics

Condensed Matter

Revised version, improvements per referee's suggestions

Scientific paper

10.1016/S0375-9601(01)00256-0

Recent measurements of the cosmic microwave background confirm that it is described by a Planckian distribution with high precision. It is non-extensivity bounded to be less than some parts in $10^5$, or to some parts in $10^4$ at most. This deviation may appear minuscule, but may have a non-negligible effect on a particle propagating through this background over the course of millions of years. In this paper we analyze the possible influence of such a slight deviation upon the propagation of nuclei and protons of ultra-high energy. These particles interact via photopion and photodisintegration processes which we examine taking into account a slight non-extensive background. We show that such a deviation does not exhibit a significant difference in the energy attenuation length of extremely high energy cosmic rays.

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