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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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Photon regions and shadows of accelerated black holes

TL;DR: In this article, the authors derived analytical formulas for the photon regions and the shadows of the black holes of the Kerr-Newman-NUT and NUT-de Sitter metrics with a cosmological constant.
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Static Spherically Symmetric Kerr-Schild Metrics and Implications for the Classical Double Copy

TL;DR: In this article, the authors discuss the physical interpretation of stress-energy tensors that source static spherically symmetric Kerr-Schild metrics and show that the sources of such metrics with no curvature singularities or horizons do not simultaneously satisfy the weak and strong energy conditions.
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Rotating neutron stars: an invariant comparison of approximate and numerical space-time models

TL;DR: In this paper, the Hartle-Thorne (1968) slow-rotation approximation, keeping terms up to second order in the stellar angular velocity, was compared with the exact analytic vacuum solution of Manko et al. (2000a, 2000b).
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Cosmology of General Relativity without Energy-Momentum Conservation

TL;DR: A modified version of the field equations of general relativity is obtained on relaxing the covariant energy-momentum conservation condition as discussed by the authors, which introduces a single arbitrary constant and does not appear to upset the successes of the general relativity in or outside cosmology.
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From Navier-Stokes to Einstein

TL;DR: In this paper, it was shown that for every solution of the incompressible Navier-Stokes equation in p + 1 dimensions, there is a uniquely associated solution for the vacuum Einstein equations in p+ 2 dimensions, and that the full dual geometry is algebraically special Petrov type II.