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- W2034585440 abstract "Cosmological observations have revealed the existence of a dark matter sector, which is commonly assumed to be made up of one particle species only. However, this sector might be more complicated than we currently believe: there might be more than one dark matter species (for example, two components of cold dark matter or a mixture of hot and cold dark matter) and there may be new interactions between these particles. In this paper we study the possibility of multiple 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 matter particles (with constant couplings) mimics a single fluid with a time-varying coupling 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 of cold and hot dark matter particles." @default.
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- W2034585440 date "2008-02-15" @default.
- W2034585440 modified "2023-10-17" @default.
- W2034585440 title "New interactions in the dark sector mediated by dark energy" @default.
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- W2034585440 doi "https://doi.org/10.1103/physrevd.77.043006" @default.
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