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Kerr-Schild-Kundt metrics are universal

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2017-04-06
GÜRSES, METİN
Sisman, Tahsin Cagri
Tekin, Bayram
We define (non-Einsteinian) universal metrics as the metrics that solve the source-free covariant field equations of generic gravity theories. Here, extending the rather scarce family of universal metrics known in the literature, we show that the Kerr-Schild-Kundt class of metrics are universal. Besides being interesting on their own, these metrics can provide consistent backgrounds for quantum field theory at extremely high energies.