Divided into four parts, this book covers recent developments in topics pertaining to gravity theories, including discussions on the presence of scalar fields.
Part One is devoted to exact solutions in general relativity, and is mainly concerned with the results of rotating null dust beams and fluids. Also included is a panoramic vision of new research directions in this area, which would require revising certain theorems and their possible extensions within gravity theories, new aspects concerning the Ernst potentials, double Kerr spacetimes, and rotating configurations. In particular, there is a detailed discussion of totally symmetric and totally geodesic spaces, in which a method for generating (2+1)-dimensional solutions from (3+1)-dimensional solutions is given.
Part Two deals with alternative theories of gravity, all of which include scalar fields and gauge fields. Here, quantum and cosmological effects, which arise from both gravity theories in four and higher dimensions and from metric-affine theories, are investigated.
Part Three is devoted to cosmological and inflationary scenarios. Local effects, such as the influence of scalar fields in protogalactic interactions, numerical studies of the collapse of molecular cores, as well as the inverse inflationary problem and the blue eigenvalue spectrum of it, are considered. Moreover, the role of scalar fields as dark matter and quantum cosmology in the Bergman-Wagoner and Gowdy theories, together with the relation of the conformal symmetry and deflationary gas universe, are likewise presented.
The last part of the book includes some mixed topics which are still in the experimental stage. Among them are the foundation of the Maxwell theory, a discussion on electromagnetic Thirring problems, a note on the staticity of black holes with non-minimally coupled scalar fields, and a study of the Lorentz force free charged fluids in general relativity.
Thus, this book is the most up-to-date, comprehensive collection of papers on the subject of exact solutions and scalar fields in gravity and is a valuable tool for researchers in the area.

Inhalt
Exact Solutions.- Self-Gravitating Stationary Axi-Symmetric Perfect Fluids: Differential Rotation and Some Geometric Features.- New Directions for the New Millennium.- On Maximally Symmetric and Totally Geodesic Spaces.- Discussion of the Theta Formula for the Ernst Potential of the Rigidly Rotating Disk of Dust.- The Superposition of Null Dust Beam in General Relativity.- Solving Equilibrium Problem for the Double-Kerr Spacetime.- Rotating Equilibrium Configurations in Einstein's Theory of Gravitation.- Integrability of SDYM Equations for the Moyal Bracket Lie Algebra.- Alternative Theories and Scalar Fields.- The FRW Universes with Barotropic Fluids in Jordan-Brans-Dicke Theory.- Higgs-Field and Gravity.- The Road to Gravitational S-Duality.- Exact Solutions in Multidimensional Gravity with P-Branes and PPN Parameters.- Effective Four-Dimensional Dilaton Gravity from Five-Dimensional Chern-Simons Gravity.- A Plane-Fronted Wave Solution in Metric-Affine Gravity.- Cosmology and Inflation.- New Solutions of Bianchi Models in Scalar-Tensor Theories.- Scalar Field Dark Matter.- Inflation with a Blue Eigenvalue Spectrum.- Classical and Quantum Cosmology with and without Self-Interacting Scalar Field in Bergmann-Wagoner Theory.- The Big Bang in T3 Gowdy Cosmological Models.- The Influence of Scalar Fields in Protogalactic Interactions.- Adaptive Calculation of a Collapsing Molecular Cloud Core: The Jeans Condition.- Revisiting the Calculation of Inflationary Perturbations.- Conformal Symmetry and Deflationary Gas Universe.- Experiments and Other Topics.- Staticity Theorem for Non-Rotating Black Holes with Non-Minimally Coupled Self-Interacting Scalar Fields.- Quantum Nondemolition Measurements and Non-Newtonian Gravity.- On Electromagnetic Thirring Problems.- On theExperimental Foundation of Maxwell's Equations.- Lorentz Force Free Charged Fluids in General Relativity: The Physical Interpretation.