2026/04/30 by Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin
#gr-qc #hep-th #math-ph #math.MP
paper · pdf · doi:10.1103/gpk6-xhjk
A metric is called universal if every symmetric conserved rank-two tensor constructed locally from the metric, the curvature, and covariant derivatives of the curvature is proportional to the metric. Such a metric solves arbitrary metric-based higher-curvature field equations after, at most, a change in the effective cosmological constant. A metric is called almost universal if the same field equations reduce instead to a finite set of algebraic conditions and a single linear scalar equation for a profile function. Universal and almost universal metrics are useful because they keep higher-curvature gravity under analytic control. Plane waves are a well-known example of universal metrics, while the Kerr-Schild-Kundt class of metrics including the pp-waves is almost universal. Here, we add a new member to this class of metrics and show that nonzero constant curvature pp-wave metrics are also almost universal. They reduce the generic gravity field equations to those of cosmological Einstein-Maxwell theory with null dust. The background of the pp-waves has the topology ℝ1,1× S2 and provides the missing partner to the Nariai metric with \rm dS2× S2 and the Bertotti-Robinson metric with \rm AdS2× S2 topologies. These quantum-protected metrics are of clear interest. We exemplify our results by using the quadratic and cubic gravity theories.