Generalized Robertson-Walker space times, a survey
Carlo Alberto Mantica, Luca Guido Molinari
TL;DR
This survey reviews generalized Robertson-Walker spacetimes, highlighting Chen's characterization via a timelike concircular vector, and presents key properties along with new findings.
Contribution
It provides a comprehensive overview of generalized Robertson-Walker spacetimes, emphasizing Chen's characterization and introducing new results on their properties.
Findings
Chen's characterization in terms of a timelike concircular vector
Key properties of generalized Robertson-Walker spacetimes
New results on their geometric properties
Abstract
Generalized Robertson-Walker spacetimes extend the notion of Robertson-Walker spacetimes, by allowing for spatial non-homogeneity. A survey is presented, with main focus on Chen's characterization in terms of a timelike concircular vector. Together with their most important properties, some new results are presented.
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