
pmid: 10014491
The integrable cosmological model with {ital n} ({ital n}{gt}1) spaces of constant curvature is investigated in the case when only one of them is not Ricci flat. This spacetime is minimally coupled with a massless scalar field. Two types of quantum wormholes with a continuous and discrete spectrum are found. The analogous result takes place for pure gravity also when the scalar field is absent.
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