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Strongly Interacting Neutrinos as the Highest Energy Cosmic Rays: A Quantitative Analysis
Markus Ahlers, Andreas Ringwald, Huitzu Tu
Scattering processes in the cosmic microwave background limit the propagation of ultra high energy charged particles in our Universe. For extragalactic proton sources resonant phot…
Noncommutativity, Extra Dimensions, and Power Law Running in the Infrared
Steven A. Abel, Joerg Jaeckel, Valentin V. Khoze +1
We investigate the running gauge couplings of U(N) noncommutative gauge theories with compact extra dimensions. Power law running of the trace-U(1) gauge coupling in the ultraviole…
Axion interpretation of the PVLAS data?
Andreas Ringwald
The PVLAS collaboration has recently reported the observation of a rotation of the polarization plane of light propagating through a transverse static magnetic field. Such an effec…
Photon Regeneration from Pseudoscalars at X-ray Laser Facilities
Raul Rabadan, Andreas Ringwald, Kris Sigurdson
Recently, the PVLAS collaboration has reported an anomalously large rotation of the polarization of light in the presence of a magnetic field. As a possible explanation they consid…
Extremely energetic cosmic neutrinos: Opportunities for astrophysics, particle physics, and cosmology
Andreas Ringwald
Existing and planned observatories for cosmic neutrinos open up a huge window in energy from 10^7 to 10^17 GeV. Here, we discuss in particular the possibilities to use extremely en…
Telltale Traces of U(1) Fields in Noncommutative Standard Model Extensions
Joerg Jaeckel, Valentin V. Khoze, Andreas Ringwald
Restrictions imposed by gauge invariance in noncommutative spaces together with the effects of ultraviolet/infrared mixing lead to strong constraints on possible candidates for a n…