We review the relations between Jordan cells in various branches of physics, ranging from
quantum mechanics to massive gravity theories. Our main focus is on holographic …

We study black hole solutions in extended gravities with higher-order curvature terms,
including conformal and Einstein-Weyl gravities. In addition to the usual anti-de Sitter (AdS) …

The classical double copy idea relates some solutions of Einstein's theory with those of
gauge and scalar field theories. We study the Kerr-Schild-Kundt (KSK) class of metrics in d …

Higher-order curvature corrections involving the conformally invariant Weyl-squared action
have played a role in two recent investigations of four-dimensional gravity: in critical gravity …

A bstract In arXiv: 1310.5713 [1] and arXiv: 1310.6659 [2] a formula was proposed as the
entanglement entropy functional for a general higher-derivative theory of gravity, whose …

We study wave metrics in the context of Cotton gravity and conformal Killing gravity. First, we
consider pp-wave metrics with flat and nonflat wave surfaces and show that they are exact …

We construct all the unitary cubic curvature gravity theories built on the contractions of the
Riemann tensor in D-dimensional (anti)-de Sitter spacetimes. Our construction is based on …

The physical modes of a recently proposed D-dimensional “critical gravity”, linearized about
its<? format?> anti-de Sitter vacuum, are investigated. All “log mode” solutions, which we …

We study Einstein gravity in dimensions D≥ 4 modified by curvature squared at critical point
where the theory contains only massless gravitons. We show that at the critical point a new …

Since all Einstein spacetimes are vacuum solutions to quadratic gravity in four dimensions,
in this paper we study various aspects of non-Einstein vacuum solutions to this theory. Most …