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Ever-present Lambda and the Quantum Potential of Spacetime
Abstract
An approach to dark energy is presented that combines ideas of causal set theory with a Machian perspective and a treatment of spacetime as a condensate, yielding a “quantum potential of spacetime” Q whose density ρQ acts as an effective Λ that satisfies the uncertainty relation ∆V∆Λ ~ 1 of unimodular relativity. In contrast to the ever-present Λ of causal set theory, ρQ’s value is always non-negative, and the nonlocality of Q ensures that ρQ is spatially homogeneous, in accordance with observation.