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Introduction to gravitation
Maurizio Gasperini,V. De Sabbata +1 more
TLDR
In this article, the authors divided their book into the following chapters: Geometry and Gravitation, the Formalism of General Relativity, Gravitational Field Equations, Three Classical Tests of Einstein's Theory, Elements of Cosmology, Relativistic Cosmological Models, Non-Static Models of the Universe; Gravitational Waves; Dense and Collapsed Matter; The Einstein-Cartan Theory; The Strong Gravity Theory; Gauge Theory of Gravity; Supergravity, and Gravitational Theory in the Language of Exterior FormsAbstract:
This book is divided into the following chapters: Contents: Geometry and Gravitation; The Formalism of General Relativity; Gravitational Field Equations; The Three Classical Tests of Einstein's Theory; Elements of Cosmology; Relativistic Cosmological Models; Non-Static Models of the Universe; Gravitational Waves; Dense and Collapsed Matter; The Einstein-Cartan Theory; The Strong Gravity Theory; Gauge Theory of Gravity; Supergravity; Gravitational Theory in the Language of Exterior Forms.read more
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Metric affine gauge theory of gravity: Field equations, Noether identities, world spinors, and breaking of dilation invariance
TL;DR: In this article, the authors present explicit models for a symmetry breakdown in the cases of the Weyl (or homothetic) group, the SL(4, R), or the GL(4-R) covering subgroup.
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Nonsingular Dirac particles in spacetime with torsion
TL;DR: In this article, the Papapetrou method of multipole expansion was used to show that a Dirac field in the Einstein-Cartan-Kibble-Sciama (ECKS) theory of gravity cannot form singular configurations concentrated on one- or two-dimensional surfaces in spacetime.
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Duffin–Kemmer–Petiau and Klein–Gordon–Fock equations for electromagnetic, Yang–Mills and external gravitational field interactions: proof of equivalence
V. Ya. Fainberg,B. M. Pimentel +1 more
TL;DR: In this article, it was shown that the physical matrix elements of the S-matrix in DKP and Klein-Gordon-Fock (KGF) theories coincide in cases of interacting spin O particles with external and quantized Maxwell and Yang-Mills fields.
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Zero-norm states and enlarged gauge symmetries of the closed bosonic string with massive background fields
Jen-Chi Lee,Burt A. Ovrut +1 more
TL;DR: In this paper, the authors used conformal symmetry on the world-sheet to derive the effective equations of motion of target space fields for the closed bosonic string up to the second massive level.
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Einstein–Cartan theory as a theory of defects in space–time
TL;DR: In this article, the Einstein-Cartan theory of gravitation and the classical theory of defects in an elastic medium are compared and an analogy is built on their common geometrical foundations, and it is shown that a spacetime with curvature and torsion can be considered as a state of a four-dimensional continuum containing defects.