Radiation of inertial scalar particles in the de Sitter universe

Abstract

We investigate the radiation from an inertial scalar particle evolving in a de Sitter expanding Universe. In the context of scalar QED the process is generated by the first order term in the perturbation theory expansion of the S-matrix. The partial transition probability is obtained and analysed, and soft-photon emission is found to dominate overall. It has been argued that an inertial particle evolving in dS spacetime loses physical momentum just as a decelerated particle in Minkowski space does. It is thus expected that an inertial charge will radiate in a similar way. We investigate the radiated energy and make a qualitative comparison of the angular distribution of the energy with the radiation pattern in the latter case.

References in corpus (6)

• Classical radiation by free-falling charges in de Sitter spacetime
• The quantum theory of scalar fields on the de Sitter expanding universe
• Classical and quantum radiation from a moving charge in an expanding universe
• Quantum Larmor radiation in conformally flat universe
• First-order quantum correction to the Larmor radiation from a moving charge in a spatially homogeneous time-dependent electric field
• Quantum Larmor radiation from a moving charge in an electromagnetic plane wave background