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arXiv · 2611.05560

An obstruction to cosmic acceleration from shift-symmetric dark sector interactions

Jose Beltrán Jiménez·Luis J. Garay·Erik Jensko·María Pérez Garrote
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Abstract

Using the effective field theory of cosmological media, we show that derivative interactions in the dark sector between a perfect fluid and a superfluid cannot support slow-roll expansion while remaining free from instabilities. Furthermore, decomposing the dark sector medium into effective dark matter and dark energy components, we find that the stability conditions exclude a phantom-to-non-phantom crossing. Our approach gives a clear route for constructing theoretically viable dark sector models, and highlights the fundamental constraints that stability requirements impose on their cosmological dynamics.

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Jose Beltrán Jiménez, Luis J. Garay, Erik Jensko, María Pérez Garrote. 2026-11-03. An obstruction to cosmic acceleration from shift-symmetric dark sector interactions. https://arxiv.org/abs/2611.05560

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