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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 new algorithm for anisotropic solutions

TL;DR: In this paper, a new solution to the Einstein field equations with an anisotropic matter distribution was generated from a seed isotropic solution, expressed in terms of integrals of an isotropics gravitational potential.
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Buchdahl–Vaidya–Tikekar model for stellar interior in pure Lovelock gravity

TL;DR: Khugaev et al. as discussed by the authors showed that the pressure isotropy equation for Buchdahl-Vaidya-Tikekar metric ansatz has the same Gauss form in higher dimensions, and hence higher dimensional solutions could be obtained by redefining the space geometry characterizing Vaidya Tikekar parameter K. In this paper we extend this analysis to pure Lovelock gravity; i.e. a $$(2N+2)$$ -dimensional solution with a given
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Rotating dilaton black holes with hair

TL;DR: In this article, the authors considered stationary rotating black holes coupled with a dilaton and showed that these special solutions do not exhibit the generic asymptotic noninteger power falloff of the non-Abelian gauge field functions.
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Spacetime encodings. I. A spacetime reconstruction problem

TL;DR: In this paper, the authors explore features of an idealized mathematical machine (algorithm) that would be capable of reconstructing the gravitational nature (the multipolar structure or spacetime metric) of a compact object, by observing gravitational radiation emitted by a small object that orbits and spirals into it.
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A survey of Einstein metrics on 4-manifolds

TL;DR: A survey of the current state of research on Einstein metrics on compact 4-manifolds can be found in this paper, where a number of open problems are presented and discussed.