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April 22h -Friday- 12:10

"Radiation emission from accelerated atoms"

Reinaldo F. de Melo e Souza

(UFRJ, Brasil)

As it is well-known an accelerated plate in vacuum emits radiation (dynamical Casimir effect). Therefore, it is expected that an accelerated atom coupled to the vacuum lectromagnetic field must also emit photons. In this work we present a quantum open system approach in order to analyze the effects of acceleration in the radiation generated by the atom. We also study its influence on the decoherence rate of atomic interferometers. Then we establish some connections of the microscopic dynamical Casimir effect and its macroscopic counterpart. In particular, we show that acceleration is a necessary condition although not a sufficient one for the atom to radiate ­ an atom vibrating in an harmonic well with a frequency below some of its transition frequencies does not radiate. We then turn our attention to excited atoms and study the modifications ensured by the atomic motion on the spontaneous emission rate, which we name dynamical Purcell effect.

Facultad de Ciencias

Seminario de Física Teórica

Universidad de Zaragoza