Geodesic
Exact solutions in multidimensional cosmology with a~term
Teoretičeskaâ i matematičeskaâ fizika, Tome 98 (1994) no. 2, pp. 312-319

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A cosmological model describing the evolution of $n$ Einstein spaces $(n>1)$ in the theory with the cosmological constant $\Lambda\ne0$ is considered. In the case, when all spaces are Ricci–flat, the exact solutions of the Einstein and Wheeler–DeWitt equations are obtained. For $\Lambda0$ the solutions are found that are treated as quantum wormholes. A generalization of the solutions to the case of a massless scalar field is obtained. 
@article{TMF_1994_98_2_a10,
     author = {V. D. Ivashchuk and V. N. Melnikov},
     title = {Exact solutions in multidimensional cosmology with a~term},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {312--319},
     publisher = {mathdoc},
     volume = {98},
     number = {2},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1994_98_2_a10/}
}
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V. D. Ivashchuk; V. N. Melnikov. Exact solutions in multidimensional cosmology with a~term. Teoretičeskaâ i matematičeskaâ fizika, Tome 98 (1994) no. 2, pp. 312-319. http://geodesic.mathdoc.fr/item/TMF_1994_98_2_a10/