Anomalous positron excess from Lorentz-violating QED

Abstract

We entertain the idea that a suitable background of cold (very low momentum) pseudoscalar particles or condensate, may trigger a background that effectively generates Lorentz-invariance violation. This aether-like background induces a Chern-Simons modification of QED. Physics is different in different frames and, in the rest frame of the pseudoscalar background, high momentum photons can decay into pairs. The threshold for such decay depends quadratically on the rest mass of the particles. This mechanism could explain in a natural way why antiprotons are absent in recent cosmic ray measurements. A similar signal could be used as a probe of pseudoscalar condensation in heavy ion collisions.

13 pages, few refs and comments on electron radiation added

References in corpus (19)

• Observation of an anomalous positron abundance in the cosmic radiation
• A Theory of Dark Matter
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Charge separation induced by P-odd bubbles in QCD matter
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• New PVLAS results and limits on magnetically induced optical rotation and ellipticity in vacuum
• PAMELA data and leptonically decaying dark matter
• Testing astrophysical models for the PAMELA positron excess with cosmic ray nuclei
• The PAMELA and ATIC Excesses From a Nearby Clump of Neutralino Dark Matter
• Cosmic Signals from the Hidden Sector
• Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing
• Dark matter and pulsar signals for Fermi LAT, PAMELA, ATIC, HESS and WMAP data
• On the consistency of Lorentz invariance violation in QED induced by fermions in constant axial-vector background
• Anomaly Induced Dark Matter Decay and PAMELA/ATIC Experiments
• On the possibility of P-violation at finite baryon-number densities
• Spontaneous P-violation in QCD in extreme conditions
• PAMELA/ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction
• Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission

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