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gr-qc1998★ 38 cited
Instantons and unitarity in quantum cosmology with fixed four-volume
Alan Daughton, Jorma Louko, Rafael D Sorkin
We find a number of complex solutions of the Einstein equations in the so-called unimodular version of general relativity, and we interpret them as saddle points yielding estimates…
gr-qc1993★ 6 cited
Initial conditions and unitarity in unimodular quantum cosmology
Alan Daughton, Jorma Louko, Rafael D. Sorkin
We consider quantization of the positive curvature Friedmann cosmology in the unimodular modification of Einstein's theory, in which the spacetime four-volume appears as an explici…