Progenitor model of Cosmic Ray knee

Abstract

Primary energy spectrum of cosmic rays exhibits a knee at about $3$ PeV where a change in the spectral index occurs. Despite many efforts the origin of such a feature of the spectrum is not satisfactorily solved yet. Here it is proposed that the steepening of the spectrum beyond the knee may be a consequence of mass distribution of progenitor of cosmic ray source. The proposed speculative model can account all the major observed features about cosmic rays without invoking any fine tuning to match flux or spectra at any energy point. The prediction of the proposed model regarding primary composition scenario beyond the knee is quite different from most of the prevailing models of the knee and thereby can be discriminated from precise experimental measurement of the primary composition.

7 pages, the revised version accepted for publication in Res. Astron. Astrophys

References in corpus (9)

• The spectrum of high-energy cosmic rays measured with KASCADE-Grande
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• The Black Hole Formation Probability
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Cited by in corpus (1)

• The knee in the cosmic ray energy spectrum from the simultaneous EAS charged particles and muon density spectra