New interactions in the dark sector mediated by dark energy - AstrophysicsReportar como inadecuado

New interactions in the dark sector mediated by dark energy - Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: Cosmological observations have revealed the existence of a dark mattersector, which is commonly assumed to be made up of one particle species only.However, this sector might be more complicated than we currently believe: theremight be more than one dark matter species for example two components of colddark matter or a mixture of hot and cold dark matter and there may be newinteractions between these particles. In this paper we study the possibility ofmultiple dark matter species and interactions mediated by a dark energy field.We study both the background and the perturbation evolution in these scenarios.We find that the background evolution of a system of multiple dark matterparticles with constant couplings mimics a single fluid with a time-varyingcoupling parameter. However, this is no longer true on the perturbative level.We study the case of attractive and repulsive forces as well as a mixture ofcold and hot dark matter particles.

Autor: A. W. Brookfield, C. van de Bruck, L. M. H. Hall


Documentos relacionados