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We explore two hypotheses. First, the possibility that the quantum vacuumenergy density of the Casimir effect contributes to a (local) gravitationalvacuum energy density. Second, the possibility that a change in thegravitational coupling implies a change in the cosmological constant. Weparametrize these two possibilities in a covariant framework and show that thenext generation of Casimir experiments does have a surprisingly good chance ofexploring this parameter space.

Vacuum energy, the Casimir effect, and Newton's non-constant