caa a22 4500 463195795 CHVBK 20180406164922.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10773-007-9349-7 doi (NATIONALLICENCE)springer-10.1007/s10773-007-9349-7 Particle Propagation in Cosmological Backgrounds [Elektronische Daten] [Daniel Arteaga, Renaud Parentani, Enric Verdaguer] We analyse the quantum propagation of interacting particles in cosmological backgrounds. The model we use consists of a doublet of massive scalar fields propagating in an expanding universe filled with massless radiation. The masses are much larger than the Hubble expansion rate, so that the number of massive particles is preserved and the fields adequately described within the adiabatic approximation. We focus on the dissipative effects related to the expansion rate by computing the imaginary part of the self-energy. In the quasi static approximation, we recover the expected result that instantaneous decay rate is governed by the local temperature. We then analyse the long time behavior of the propagator to unravel the secular effects induced by the self-energy. We show that these effects can be expressed in terms of integrals of local quantities. Applications to the trans-Planckian question are briefly discussed. Springer Science+Business Media, LLC, 2007 Arteaga Daniel Departament de Física Fonamental, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Spain aut Parentani Renaud Laboratoire de Physique Théorique, CNRS UMR 8627, Université Paris XI, Cedex, 91405, Orsay, France aut Verdaguer Enric Departament de Física Fonamental and CER en Astrofísica, Física de Partícules i Cosmologia, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Spain aut International Journal of Theoretical Physics Springer US; http://www.springer-ny.com 46/9(2007-09-01), 2227-2241 0020-7748 46:9<2227 2007 46 10773 https://doi.org/10.1007/s10773-007-9349-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10773-007-9349-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Arteaga Daniel Departament de Física Fonamental, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Spain aut NATIONALLICENCE 700 1- Parentani Renaud Laboratoire de Physique Théorique, CNRS UMR 8627, Université Paris XI, Cedex, 91405, Orsay, France aut NATIONALLICENCE 700 1- Verdaguer Enric Departament de Física Fonamental and CER en Astrofísica, Física de Partícules i Cosmologia, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Spain aut NATIONALLICENCE 773 0- International Journal of Theoretical Physics Springer US; http://www.springer-ny.com 46/9(2007-09-01), 2227-2241 0020-7748 46:9<2227 2007 46 10773 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer