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.

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Cited by in corpus (6)

• Infrared dynamics of massive scalars from the complementary series in de Sitter space
• Vacuum Cherenkov radiation and bremsstrahlung from disformal couplings
• One-photon pair production on the expanding de Sitter spacetime
• Late-time quantum radiation by a uniformly accelerated detector in de Sitter spacetime
• Quantum Larmor radiation in de Sitter spacetime
• Gauge dependence in QED amplitudes in expanding de Sitter space