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The discovery of cosmic acceleration has presented a unique challenge forcosmologists. As observational cosmology forges ahead, theorists have struggledto make sense of a standard model that requires extreme fine tuning. Thischallenge is known as the cosmological constant problem. The theory ofgravitational aether is an alternative to general relativity that does notsuffer from this fine-tuning problem, as it decouples the quantum field theoryvacuum from geometry, while remaining consistent with other tests of gravity.In this paper, we study static black hole solutions in this theory and showthat it manifests a UV-IR coupling: Aether couples the spacetime metric closeto the black hole horizon, to metric at infinity. We then show that using theTrans-Planckian ansatz (as a quantum gravity effect) close to the black holehorizon, leads to an accelerating cosmological solution, far from the horizon.Interestingly, this acceleration matches current observations for stellar massblack holes. Based on our current understanding of the black hole accretionhistory in the Universe, we then make a prediction for how the effective darkenergy density should evolve with redshift, which can be tested with futuredark energy probes.

Stellar Black Holes and the Origin of Cosmic Acceleration