The paper derives modified propagator identities and discontinuity operations that generalize Bogoliubov-state cosmological cutting rules to fields of arbitrary mass and spin.
Trans-Planckian Particle Creation in Cosmology and Ultra-High Energy Cosmic Rays
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abstract
We consider observational constraints on creation of particles induced by hypothetical trans-Planckian effects during the current stage of the Universe expansion. We show that compatibility with the diffuse gamma-ray background measured by the EGRET experiment strongly restricts this creation. In particular, it rules out the possibility to detect signatures of such short distance effects in anisotropies of the cosmic microwave background radiation. On the other hand, a possibility that some part of the ultra-high energy cosmic rays originates from new trans-Planckian physics remains open.
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Cosmological cutting rules for Bogoliubov initial states: any mass and spin
The paper derives modified propagator identities and discontinuity operations that generalize Bogoliubov-state cosmological cutting rules to fields of arbitrary mass and spin.