The Cosmological Probability Density Function for Bianchi Class A Models in Quantum Supergravity


Hugh Luckock and Chris Oliwa


Research Report 94-42
Date: 9 December 1994


Nicolai's theorem suggests a simple stochastic interpretation for supersymmetric Euclidean quantum theories, without requiring any inner product to be defined on the space of states. In order to apply this idea to supergravity, we first reduce to a one-dimensional theory with local supersymmetry by the imposition of homogeneity conditions. We then make the supersymmetry rigid by imposing gauge conditions, and quantise to obtain the evolution equation for a time-dependent wave function. Owing to the inclusion of a certain boundary term in the classical action, and a careful treatment of the initial conditions, the evolution equation has the form of a Fokker-Planck equation. Of particular interest is the static solution, as this satisfies all the standard quantum constraints. This is naturally interpreted as a cosmological probability density function, and is found to coincide with the square of the magnitude of the conventional wave function for the wormhole state.

Key phrases

canonically quantised supergravity. homogeneous cosmologies. interpretation of the wave function.

AMS Subject Classification (1991)

Primary: 83E50
Secondary: 83F05, 83C45, 83C20, 81Q60


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