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General Relativity and the Tully-Fisher Relation for Rotating Galaxies
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作者 Yogendra Srivastava Giorgio Immirzi +2 位作者 John Swain Orlando Panella Simone Pacetti 《Journal of Modern Physics》 CAS 2022年第11期1452-1473,共22页
The flat limit of rotational velocity (v<sub>&phi;</sub>) approximately equal to the “edge”-velocity of a galaxy is related to the baryonic mass (M<sub>B</sub>) via the T-F relationship w... The flat limit of rotational velocity (v<sub>&phi;</sub>) approximately equal to the “edge”-velocity of a galaxy is related to the baryonic mass (M<sub>B</sub>) via the T-F relationship with n ≈ 4. We explore the connection between mass and the limiting velocity in the framework of general relativity (GR) using the Weyl metric for axially-symmetric galaxies that are supported entirely by their rotational motion. While for small distances from the center, the Newtonian description is accurate as one moves beyond the (baryonic) edge of the galaxy, Lenz’s law and non-linearity of the gravitational field inherent in GR not only lead to a flat velocity (obviating its Keplerian fall), but also provide its tight log-log relationship with the enclosed (baryonic) mass. 展开更多
关键词 GR Weyl Metric rotating Galaxies flat Rotation Curves TF Relation
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Noncommutative Geometry and MOND
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作者 Peter K. F. Kuhfittig 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2022年第3期642-646,共5页
Modified Newtonian dynamics (MOND) is a hypothesized modification of Newton’s law of universal gravitation to account for the flat rotation curves in the outer regions of galaxies, thereby eliminating the need for da... Modified Newtonian dynamics (MOND) is a hypothesized modification of Newton’s law of universal gravitation to account for the flat rotation curves in the outer regions of galaxies, thereby eliminating the need for dark matter. Although a highly successful model, it is not a self-contained physical theory since it is based entirely on observations. It is proposed in this paper that noncommutative geometry, an offshoot of string theory, can account for the flat rotation curves and thereby provide an explanation for MOND. This paper extends an earlier heuristic argument by the author. 展开更多
关键词 Noncommutative Geometry MOND flat Galactic Rotation Curves Dark Matter
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New Expansion Dynamics Applied to the Planar Structures of Satellite Galaxies and Space Structuration
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作者 Jacques Fleuret 《Journal of Modern Physics》 2016年第16期2357-2365,共10页
Recent observations of Dwarf Satellite Galaxies (DSG) show that they have a clear tendency to stay in particular planes. Explanations with standard physics remain controversial. Recently, I proposed a new explanation ... Recent observations of Dwarf Satellite Galaxies (DSG) show that they have a clear tendency to stay in particular planes. Explanations with standard physics remain controversial. Recently, I proposed a new explanation of the galactic flat rotation curves, introducing a new cosmic acceleration due to expansion. In this paper, I apply this new acceleration to the dynamics of DSG’s (without dark matter). I show that this new acceleration implies planar structures for the DSG trajectories. More generally, it is shown that this acceleration produces a space structuration around any massive center. It remains a candidate to explain several cosmic observations without dark matter. 展开更多
关键词 Dwarf Satellite Galaxies Dark Matter Expansion flat Rotation Curves GALAXIES Structure GRAVITATION SYMMETRY
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