Abstract
We analyse a three-field model, which describes a relativistic two-level atom interactingwith a radiation bath. From the one-loop retarded propagators at finite temperature we extract the transition rates and the modifications of the dispersion relations. To further investigate the relationships between propagators and these physical quantities, we analyse a non-equilibrium situation in which an additional atom is present in the bath. Preliminary results indicate that transition rates can still be extracted from the (retarded) propagator. This approach couldtherefore be useful in relating high-frequency (trans-Planckian) dispersion relations to the physical processes occurring at these scales.
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Arteaga, D., Parentani, R. & Verdaguer, E. Retarded Green Functions and Modified Dispersion Relations. Int J Theor Phys 44, 1665–1689 (2005). https://doi.org/10.1007/s10773-005-8888-z
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DOI: https://doi.org/10.1007/s10773-005-8888-z