214 citations · 222 across the 3 of their papers we have counts for
5 papers
Extremely high energy cosmic rays from relic particle decays
Michael Birkel, Subir Sarkar
The expected proton and neutrino fluxes from decays of massive metastable relic particles is calculated using the HERWIG QCD event generator. The predicted proton spectrum can acco…
Ruling out a critical density baryonic universe
Michael Birkel, Subir Sarkar
It has been suggested by Bartlett and Hall that our universe may have the critical density in baryons by virtue of specific interactions with a `shadow' world. We show that this po…
On Pulsar Velocities from Neutrino Oscillations
Michael Birkel, Ramon Toldra
It has been recently suggested that magnetically affected neutrino oscillations inside a cooling protoneutron star, created in a supernova explosion, could explain the large proper…
Nucleosynthesis bounds on a time-varying cosmological 'constant'
Michael Birkel, Subir Sarkar
We constrain proposed phenomenological models for a vacuum energy which decays with the expansion of the universe from considerations of standard big bang nucleosynthesis. Several…
Nucleon Spin and the Mixing of Axial Vector Mesons
Michael Birkel, Harald Fritzsch
It is shown that the QCD anomaly may lead to an abnormal mixing behavior of the axial vector mesons similar to the pseudoscalar mesons. These mixing effects, involving a gluonic ax…