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Physics Letters B, 2006 The possibility of a symmetry between gravitating and anti-gravitating particles is examined. The properties of the anti-gravitating fields are defined by their behavior under general diffeomorphisms. The equations of motion and the conserved canonical currents are derived, and it is shown that the kinetic energy remains positive whereas the new fields
Arkani-Hamed +22 more
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Gravitation as Anholonomy [PDF]
General Relativity and Gravitation, 2003 A gravitational field can be seen as the anholonomy of the tetrad fields. This is more explicit in the teleparallel approach, in which the gravitational field-strength is the torsion of the ensuing Weitzenboeck connection. In a tetrad frame, that torsion is just the anholonomy of that frame.
Aldrovandi, R. +2 more
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Gravitational Fields and Gravitational Waves [PDF]
Physics Essays, 2021 Abstract For any object with finite velocity, the relative velocity between them will affect the effect between them. This effect can be called the chasing effect (general Doppler effect). LIGO discovered gravitational waves and measured the speed of gravitational waves equal to the speed of light c. Gravitational waves are generated due to the
Yuan, Tony, Yuan, Tony
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Gravitational lensing by gravitational waves [PDF]
Gravitation and Cosmology, 2008 9 pages, 3 ...
O. Yu. Tsupko +4 more
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Gravitational Waves from Gravitational Collapse [PDF]
Living Reviews in Relativity, 2003 68 pages including 13 figures; revised version accepted for publication in Living Reviews in Relativity (http://www.livingreviews.org)
Kimberly C. B. New, Chris L. Fryer
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Journal of High Energy Physics, 2023 Abstract We consider four-dimensional general relativity with vanishing cosmological constant defined on a manifold with a boundary. In Lorentzian signature, the timelike boundary is of the form σ × ℝ, with σ a spatial two-manifold that we take to be either flat or S2. In Euclidean signature we take the boundary to be S2 × S1.
Dionysios Anninos +2 more
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Gravitational decoherence [PDF]
Classical and Quantum Gravity, 2017 We discuss effects of loss of coherence in low energy quantum systems caused by or related to gravitation, referred to as gravitational decoherence. These effects, resulting from random metric fluctuations, for instance, promise to be accessible by relatively inexpensive table-top experiments, way before the scales where true quantum gravity effects ...
Angelo Bassi +2 more
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Physical Review D, 2019 Particles in a yet unexplored dark sector with sufficiently large mass and small gauge coupling may form purely gravitational atoms (quantum gravitational bound states) with a rich phenomenology. In particular, we investigate the possibility of having an observable signal of gravitational waves or ultra high energy cosmic rays from the decay of ...
Nielsen, Niklas G. +2 more
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Journal of Cosmology and Astroparticle Physics, 2021 Abstract We study the impact of thermalization and number-changing processes in the dark sector on the yield of gravitationally produced dark matter (DM). We take into account the DM production through the s-channel exchange of a massless graviton both from the scattering of inflatons during the reheating era, and from the Standard Model
Barman, Basabendu, Bernal, Nicolás
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