Phys. Rev. Lett. 65, 1972–1974 (1990)Possible solution to the cosmological-constant problemReceived 27 April 1990; published in the issue dated 15 October 1990 Classically, the unimodular theory of gravity with a constrained determinant gμν is equivalent to general relativity augmented by an arbitrary cosmological constant Λ, which arises as an integration constant. At the quantum level we argue that an integration over Λ should be included in the Euclidean path integral for the vacuum functional. The fully renormalized Λ=0 overwhelmingly dominates all other contributions yielding a zero observed cosmological constant. While the technical part of our argument is similar to that of the ‘‘wormhole’’ argument, the two approaches are logically different. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.65.1972
DOI:
10.1103/PhysRevLett.65.1972
PACS:
04.60.+n, 04.20.Cv, 04.50.+h, 98.80.Dr
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