Results 31 to 40 of about 365,472 (267)
Generalising the coupling between spacetime and matter
Physics Letters B, 2017 We explore the idea that the coupling between matter and spacetime is more complex than the one originally envisioned by Einstein. We propose that such coupling takes the form of a new fundamental tensor in the Einstein field equations. We then show that
Sante Carloni
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The Newtonian potential in gravitational cohomology. [PDF]
Physics Essays, 2009 We examine the Newtonian potential in gravitational cohomology. This is given by a symmetric, two-index tensor field, which satisfies the wave equation in empty space. Furthermore, the associated gravitational field strength, obtained by applying the coboundary operator to the potential, is constructed for the case of a stationary point mass and shown ...
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Self-Gravitating Newtonian Disks Revisited [PDF]
, 2013 Recent analytic results concerning stationary, self-gravitating fluids in Newtonian theory are discussed. We give a theorem that forbids infinitely extended fluids, depending on the assumed equation of state and the rotation law. This part extends previous results that have been obtained for static configurations.
Mach, Patryk +2 more
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It is not Easy to Replace Newtonian Gravitational Theory! [PDF]
Symposium - International Astronomical Union, 1988 The great amount of unseen dynamical matter in large scale structures is derived from: the Newton's law of inertia and the theory of gravitation. But none of these law has been tested on scale larger than r > 10Kpc. It is then tempting to modify them following: where g(x) is a phenomenological function.
D. Gerbal, H. Siroussezia
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IET Networks, EarlyView., 2022 Abstract Everything can be connected in the Internet of Things (IoTs) technology that enables efficient communication between connected objects. IoTs industry‐based meta‐heuristic and mining algorithms, which are considered an important field of Artificial Intelligence will be used to construct a healthcare application in this study for lowering costs,
Muhaned Al‐Hashimi +4 more
wiley +1 more source
New explanation for accelerated expansion and flat galactic rotation curves
European Physical Journal C: Particles and Fields, 2020 Employing the non-additive Tsallis entropy, $$S\sim A^{\beta }$$ S∼Aβ , for the large-scale gravitational systems, we disclose that in the cosmological scales both the Friedmann equation and the equation of motion for Newtonian cosmology get modified ...
Ahmad Sheykhi
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On the Newtonian Limit of the Weyl Tensor [PDF]
, 2009 In this note we wish to complement some recent work in the cosmological literature concerning the Weyl conformal curvature tensor and its parts. In particular, we shall give a clear-cut definition of the Newtonian limits of electric and magnetic parts of
Buchert, Thomas, Ehlers, Juergen
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Density Profiles of 51 Galaxies from Parameter-Free Inverse Models of Their Measured Rotation Curves
Galaxies, 2020 Spiral galaxies and their rotation curves have key characteristics of differentially spinning objects. Oblate spheroid shapes are a consequence of spin and reasonably describe galaxies, indicating that their matter is distributed in gravitationally ...
Robert E. Criss, Anne M. Hofmeister
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The equivalence and/or the effacing principle in $$ f\left( R\right) $$ f R theories of gravity
European Physical Journal C: Particles and Fields, 2022 The Einstein–Hilbert action of the general theory of relativity (GR) is the integral of the scalar curvature R. It is a theory that is drawn from the Equivalence principle and has predictions that come out as a consequence of the principle, in ...
Soham Bhattacharyya
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Equivalent period for a stationary quantum system
Results in Physics, 2019 A generalization of the Kepler’s third law has been proposed for classical and quantum N-body systems in a Newtonian gravitation field. This implies the definition of the equivalent of a period for a stationary quantum system.
Claude Semay, Cintia Willemyns
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