A simple characterization of doubly twisted spacetimes
arXiv:2101.02208 · doi:10.1142/S0219887821500791
Abstract
In this note we characterize 1+n doubly twisted spacetimes in terms of `doubly torqued' vector fields. They extend Bang-Yen Chen's characterization of twisted and generalized Robertson-Walker spacetimes with torqued and concircular vector fields. The result is a simple classification of 1+n doubly-twisted, doubly-warped, twisted and generalized Robertson-Walker spacetimes.
arXiv comment6 pages. Theorem 2.2 improved (doubly warped spacetimes)
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