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Cosmological constant problem (in its various versions) is arguably thedeepest gap in our understanding of theoretical physics, the solution to whichmay very likely require revisiting the Einstein theory of gravity. In thisletter, I argue that the simplest consistent way to decouple gravity from thevacuum energy (and hence solve the problem) is through the introduction of anincompressible gravitational aether fluid. The theory then predicts thatgravitational constant for radiation is 33% larger than that ofnon-relativistic matter, which is preferred by most cosmological observations(with the exception of light element abundances), but is not probed by currentprecision tests of gravity. I also show that slow-roll inflation can happen inthis theory, with only minor modifications. Finally, interpreting gravitationalaether as a thermodynamic description of gravity, I propose afinite-temperature correction to the equation of state of gravity, which wouldexplain the present-day acceleration of the cosmic expansion as a consequenceof the formation of stellar mass black holes.

Gravitational Aether and the thermodynamic solution to the cosmological constant problem