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Exact Solutions of Einstein's Field Equations

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TLDR
A survey of the known solutions of Einstein's field equations for vacuum, Einstein-Maxwell, pure radiation and perfect fluid sources can be found in this paper, where the solutions are ordered by their symmetry group, their algebraic structure (Petrov type) or other invariant properties such as special subspaces or tensor fields and embedding properties.
Abstract
A paperback edition of a classic text, this book gives a unique survey of the known solutions of Einstein's field equations for vacuum, Einstein-Maxwell, pure radiation and perfect fluid sources. It introduces the foundations of differential geometry and Riemannian geometry and the methods used to characterize, find or construct solutions. The solutions are then considered, ordered by their symmetry group, their algebraic structure (Petrov type) or other invariant properties such as special subspaces or tensor fields and embedding properties. Includes all the developments in the field since the first edition and contains six completely new chapters, covering topics including generation methods and their application, colliding waves, classification of metrics by invariants and treatments of homothetic motions. This book is an important resource for graduates and researchers in relativity, theoretical physics, astrophysics and mathematics. It can also be used as an introductory text on some mathematical aspects of general relativity.

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A static axisymmetric exact solution of f(R)-gravity

TL;DR: In this paper, an exact, axially symmetric, static, vacuum solution for f ( R ) -gravity in Weyl's canonical coordinates is presented, which must be consistent with the field equations.
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Chaotic motion in pp-wave spacetimes

TL;DR: In this article, the authors investigate geodesics in non-homogeneous vacuum pp-wave solutions and demonstrate their chaotic behaviour by rigorous analytic and numerical methods, and show that the boundary between different outcomes has a fractal structure.
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Geodesic motion in Bogoslovsky-Finsler spacetimes

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Bianchi II with time varying constants. Self-similar approach

TL;DR: In this article, a self-similarity approach was applied to the Bianchi II model with time varying constants under the selfsimilarity assumption, and it was shown that G must be a growing time function while Λ is a positive decreasing function.