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Observables in General Relativity
Reviews of Modern Physics, 1961The notion of observable in general relativity differs profoundly from the corresponding concept in special relativity and in Newtonian physics. This is because in general relativity fixation of a frame of reference and gauge transformations are intertwined in a manner not encountered in any other area of physics.
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Topology in General Relativity
Journal of Mathematical Physics, 1967A number of theorems and definitions which are useful in the global analysis of relativistic world models are presented. It is shown in particular that, under certain conditions, changes in the topology of spacelike sections can occur if and only if the model is acausal. Two new covering manifolds, embodying certain properties of the universal covering
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The Beauty of General Relativity
Foundations of Science, 1997The author proposes to add another dichotomy to the list of essential tensions proposed by Professor Duda, namely beauty and ugliness. Physicists believe that only beautiful theories describe the world correctly, and that General Relativity is one of the most beautiful physical theories.
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Milestones of general relativity
Reports on Progress in Physics, 2016We present a summary for non-specialists of the special issue of the journal Classical and Quantum Gravity on 'Milestones of general relativity', commemorating the 100th anniversary of the theory.
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The zilch in general relativity
Il Nuovo Cimento, 1965The conditions for the vanishing of the covariant divergence of traceless, bilinear combinations of Van der Waerden spinors are investigated for the electromagnetic field in the presence of gravitation, and the free gravitational field.
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Lectures on General Relativity
General Relativity and Gravitation, 2002The paper is a collection of 5 lectures of the author. The first part is devoted to the question of boundary conditions in gravitational radiation theory. For the gravitational radiation a condition similar to the ``Ausstrahlungsbedingung'' of Sommerfeld is suggested.
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Generalizing General Relativity
2021In this chapter we review 5 popular models of modifying and/or generalizing our current understanding of spacetime. These are: Brans-Dicke theory, f(R) theory, Gauss-Bonnet theory, Kaluza-Klein theory, and finally Cartan’s theory of gravity.
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The Buzz of General Relativity
Science, 1999Neutron stars and black holes have the strongest gravity, and hence--according to Einstein9s general theory of relativity--curve space-time the tightest, of all known objects in the universe. Observations by NASA9s Rossi X-ray Timing Explorer (RXTE) are now providing the first direct measurements of the orbital motion of matter in these strongly curved
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Special relativity in general relativity?
Journal of Mathematical Physics, 1974Starting from the metric in harmonic coordinates for a test particle m1 around a heavy particle m2(m2≫m1) at rest, the EIH Lagrangian is recovered by making a Lorentz transformation, followed by a canonical transformation and an appropriate symmetrization in the two masses. This raises the question of a special relativity content in general relativity,
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