# Particle propagation in cosmological backgrounds

@article{Arteaga2007ParticlePI, title={Particle propagation in cosmological backgrounds}, author={Daniel Pena Arteaga}, journal={Journal of Physics A: Mathematical and Theoretical}, year={2007}, volume={40}, pages={6901 - 6906} }

We study the quantum propagation of particles in cosmological backgrounds, by considering a doublet of massive scalar fields propagating in an expanding universe, possibly filled with radiation. We focus on the dissipative effects related to the expansion rate. At first order, we recover the expected result that the decay rate is determined by the local temperature. Beyond linear order, the decay rate has an additional contribution governed by the expansion parameter. This latter contribution…

## 6 Citations

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