Thursday, November 21,
2013, 3pm
Location: Room 1110 of the Nguyen Engineering Building
Robert Ehrlich
School of Physics, Astronomy, and Computational Sciences (retired)
George Mason University
Evidence
for a Peak at
5.86 PeV in the Cosmic Ray Spectrum: Implications for Tachyonic
Neutrinos and Cosmic Strings
Abstract
Evidence is reported for a
peak at 5.86 +/- 0.75 PeV for cosmic rays having arrival directions
within several degrees of 68 candidate sources, which adds support to a
1999 claim of a peak at 4.5 +/- 2.2 PeV. Moreover,
the existence of such a peak had been suggested prior to that
earlier claim based on the assumption that the electron neutrino is a
tachyon, having m2 approximately -0.25eV2, that
in turn was based
on a fit to the cosmic ray spectrum. An examination of the
distribution of the candidate sources of the cosmic rays at the peak
energy suggests that their source may be extragalactic cosmic strings.