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Search Results: 1 - 10 of 240 matches for " Gravitation "
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Spin, the Classical Theory  [PDF]
Richard T. Hammond
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.31001
Abstract: With the development of local gauge theories of gravitation, it became evident that intrinsic spin was an integral part of the theory. This gave spin a classical formulation that predicted the existence of a new kind of field, the torsion field. To date only one class of experiments has been developed to detect this field, a search for a long range dipole force. In this article, the torsion equations are de-coupled from the curved space of general relativity derived from basic principles using vector calculus and the theory of electromagnetism as a guide. The results are written in vector form so that they are readily available to experimentalists, paving the way for new kinds of experiments.
Analysis of the Expansion of Space and a Theory of the Big Implosion  [PDF]
Paul Gradenwitz
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2018, DOI: 10.4236/jhepgc.2018.41005
Abstract: In this article, the model of an expanding universe, which is more than a century old and evolved into the Λ-CDM, is found to violate causality. This is shown by constructing the lightcone, which is relevant for any point in space, and by calculating the curvature for that point. From these calculations it is concluded that for any homogeneous and isotropic energy density in space, the geodesic of a test mass in it is always straight. With that, it follows that space is flat for any energy density. Furthermore an alternative theory is proposed as a demonstration that, with different explanations of the astronomical observations, a theory can be constructed that isn’t in contradiction with General Relativity.
Gravitational Model of the Three Elements Theory  [PDF]
Frederic Lassiaille
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.35054
Abstract: The gravitational model of the three elements theory is an alternative theory to dark matter. It uses a modification of Newton’s law in order to explain gravitational mysteries. The results of this model are explanations for the dark matter mysteries, and the Pioneer anomaly. The disparity of the gravitational constant measurements might also be explained. Concerning the Earth flyby anomalies, the theoretical order of magnitude is the same as the experimental one. A very small change of the perihelion advance of the planet orbits is calculated by this model. Meanwhile, this gravitational model is perfectly compatible with restricted relativity and general relativity, and is part of the three element theory, a unifying theory.
Gravitational Signature of Matter-Antimatter Interaction  [PDF]
Shawqi Al Dallal, Walid J. Azzam, Mar de Fez
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.63026
Abstract: The gravitational signature of antimatter has received growing interest during the past few decades. Much of the theoretical work in ordinary tensor gravity rules out any difference in the gravitational interaction of matter and antimatter. Fundamental principles and theoretical models describing the nature of matter and antimatter are reviewed. The implication of a probable repulsive field between matter and antimatter and its far reaching consequences on certain cosmic issues, such as the early phase of the Big Bang, the Hawking radiation, virtual particle production and annihilations, are discussed. Experiments designed to probe the gravitational signature of antimatter are reviewed, and a new space-borne experiment to probe the nature of matter-antimatter interactions is proposed.
Stability of Atoms, Causality in Elementary Processes and the mystery of Interference and Hyroscope  [PDF]
Vladimir Konushko
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.33032
Abstract: An investigation into real structure of space allows solving in a new way the problem of stability of atom: an electron on the ground level is a rest. The absolute causality of all the phenomena in the Universe is substantiated. Heisenberg inequalities make some sense only when it is impossible to conjugated physical values. The work is concern with the mystery of interference and hyroscope.
Can Effects of Dark Matter Be Explained by the Turbulent Flow of Spacetime?  [PDF]
F. Elliott Koch, Angus H. Wright
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329146
Abstract: For the past forty years the search for dark matter has been one of the primary foci of astrophysics, although there has yet to be any direct evidence for its existence [1]. Indirect evidence for the existence of dark matter is largely rooted in the rotational speeds of stars within their host galaxies, where, instead of having a :r1/2 radial dependence, stars appear to have orbital speeds independent of their distance from the galactic center, which led to proposed existence of dark matter [1,2]. We propose an alternate explanation for the observed stellar motions within galaxies, combining the standard treatment of a fluid-like spacetime with the possibility of a “bulk flow” of mass through the Universe. The differential “flow” of spacetime could generate vorticies capable of providing the “perceived” rotational speeds in excess of those predicted by Newtonian mechanics. Although a more detailed analysis of our theory is forthcoming, we find a crude “order of magnitude” calculation can explain this phenomena. We also find that this can be used to explain the graviational lensing observed around globular clusters like “Bullet Cluster”.
Gravitational Model of the Three Elements Theory: Mathematical Explanations  [PDF]
Frederic Lassiaille
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.47138

The aim is to parse the mathematical details related to the gravitational model of the three elements theory [1]. This model is proven to be coherent and really compatible with relativity. The Riemannian representation of space-time which is used in this model is proven to be legal. It allows to understand relativity in a more human sensitive manner than Minkowskian usual representation.

Gravito-Electric Power Generation  [PDF]
Roger Ellman
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.25013
Abstract: It is now possible to deflect gravitational action away from an object so that the object is partially levitated. That effect makes it possible to extract energy from the gravitational field, which makes the generation of gravito-electric power technologically feasible. Such plants would be similar to hydro-electric plants and would have their advantages of not needing fuel and not polluting the environment. However, gravito-electric plants could be much smaller than hydro-electric plants; their location would not be restricted to suitable water elevations, and the plants and their produced energy would be much less expensive. Gravito-electric power can be placed into operation now. It can replace all existing nuclear and fossil fuel plants, and would essentially solve the problem of global warming to the extent it is caused by fossil fuel use. The physics development is comprehensively presented. That is followed by the engineering design.
About Lorentz Invariance and Gauge Symmetries: An Alternative Approach to Relativistic Gravitation  [PDF]
Richard Bonneville
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.616113
Abstract: An alternative presentation of a relativistic theory of gravitation, equivalent to general relativity, is given. It is based upon the restriction of the Lorentz invariance of special relativity from a global invariance to a local one. The resulting expressions appear rather simple as we consider the transformations of a local set of pseudo-orthonormal coordinates and not the geometry of a 4-dimension hyper-surface described by a set of curvilinear coordinates. This is the major difference with the usual presentations of general relativity but that difference is purely formal. The usual approach is most adequate for describing the universe on a large scale in astrophysics and cosmology. The approach of this paper, derived from particle physics and focused on local reference frames, underlines the formal similarity between gravitation and the other interactions inasmuch as they are associated to the restriction of gauge symmetries from a global invariance to a local one.
A Modified Relativistic Model of Gravitational Propagation  [PDF]
Jonathan Peter Merrison
International Journal of Astronomy and Astrophysics (IJAA) , 2016, DOI: 10.4236/ijaa.2016.63026
Abstract: A novel model of gravity is proposed and developed by modifying general relativity through propagating the gravitational field in an entirely analogous way to that of electromagnetic fields. It is therefore not a purely geometric model of gravitation, but is self-consistent, having clear causality and has the benefit of being inherently compatible with unified field theories. This model reproduces the observed almost constant rotational velocities of many galaxies as well as other large scale non-Keplerian motion. This is achieved without assuming the existence of dark matter and is made possible by modelling a rapidly rotating central star which with the inclusion of a velocity induced Doppler shift (of gravity) generates a highly anisotropic and intense, sheet like gravitational field. At extremely high gravitational fields this model remains real and finite i.e. does not generate a black hole, instead it asymptotically approaches a field limit below which light may escape. This is due to the inclusion of self-interaction of gravity in vacuum leading to a non-li nearity in the propagation of gravitational energy i.e. the effects of a gravitational field upon itself. This model is implemented computationally using an iterative finite element model. On the scale of our solar system these corrections are small and are shown not to be in obvious disagreement with high precision solar system tests.
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