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We present a classical field theory which has a long epoch resembling the Friedmann universe despite the presence of a large negative cosmological constant. In its most plausible realization the model involves a massive third-rank antisymmetric-tensor gauge field. To be consistent with standard cosmology the mass must be extremely small and the only reasonable mechanism for generating it is a semiclassical tunneling effect.
Tom Banks (Mon,) studied this question.
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