A simple characterization of doubly twisted spacetimes
Carlo Alberto Mantica, Luca Guido Molinari
TL;DR
This paper provides a straightforward classification of doubly twisted spacetimes by characterizing them with doubly torqued vector fields, extending previous work on related spacetime types.
Contribution
It introduces a simple characterization of doubly twisted spacetimes using doubly torqued vector fields, expanding the understanding of spacetime classifications.
Findings
Characterization of doubly twisted spacetimes using doubly torqued vector fields
Extension of Chen's work on twisted and Robertson-Walker spacetimes
Unified classification of various spacetime types
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.
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