Title: Long-range dark matter self-interactions in cosmology
In this talk we describe how future cosmological observations can constrain long-range dark matter forces scenarios in which the new interaction acts only in the Dark Sector. First, we introduce the model with a massless force mediator that captures the desired properties and describe its salient features. Its non-trivial cosmological background evolution strongly affects the prediction for the total matter clustering. Then we put constrains on the strength of the self-interaction using CMB data and current (and future) galaxy clustering data, finding that the new force must be weaker than gravity below percent level. Finally we introduce a mass for the mediator, considering interaction lengths larger than 0.1 Mpc, and extend the constraints to this scenario.
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