Trans-Planckian particle creation in cosmology and ultra-high energy cosmic rays
A. A. Starobinsky, I. I. Tkachev+
Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
+Theory Division, CERN, CH-1211 Geneva 23, Switzerland
PACS: 04.62.+v, 98.70.Vc, 98.80.Cq
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 γ-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 ultra-high energy cosmic rays
originates from new trans-Planckian physics remains open.