Universe without dark energy: Cosmic acceleration from dark matter-baryon interactions

@article{Berezhiani2017UniverseWD,
  title={Universe without dark energy: Cosmic acceleration from dark matter-baryon interactions},
  author={Lasha Berezhiani and Justin Khoury and Junpu Wang},
  journal={Physical Review D},
  year={2017},
  volume={95},
  pages={123530}
}
Cosmic acceleration is widely believed to require either a source of negative pressure (i.e., dark energy), or a modification of gravity, which necessarily implies new degrees of freedom beyond those of Einstein gravity. In this paper we present a third possibility, using only dark matter and ordinary matter. The mechanism relies on the coupling between dark matter and ordinary matter through an effective metric. Dark matter couples to an Einstein-frame metric, and experiences a matter… 

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