Ultrahigh energy cosmic rays: Clustering, GUT scale and neutrino masses

Research output: Contribution to journalConference articlepeer-review


The origin of highest energy cosmic rays (UHECR) is yet unknown. In order to understand their propagation we determine the probability that an ultrahigh energy (above 5 · 1019 eV) proton created at a distance r with energy E arrives at earth above a threshold Ec. The clustering of ultrahigh energy cosmic rays suggests that they might be emitted by compact sources. A statistical analysis on the source density based on the multiplicities is presented. The ultrahigh energy cosmic ray spectrum is consistent with the decay of GUT scale particles. Alternatively, we consider the possibility that a large fraction of the ultrahigh energy cosmic rays are decay products of Z bosons which were produced in the scattering of ultrahigh energy cosmic neutrinos on cosmological relic neutrinos. Based on this scenario we determine the required mass of the heaviest relic neutrino. The required ultrahigh energy neutrino flux should be detected in the near future by experiments such as AMANDA, RICE or the Pierre Auger Observatory.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2002
Event26th Johns Hopkins Workshop on Current Problems in Particle Theory: High Energy Reactions, JHW 2002 - Heidelberg, Germany
Duration: Aug 1 2002Aug 3 2002

All Science Journal Classification (ASJC) codes

  • General


Dive into the research topics of 'Ultrahigh energy cosmic rays: Clustering, GUT scale and neutrino masses'. Together they form a unique fingerprint.

Cite this