Academic literature on the topic 'THEORIES OF GRAVITY'

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Journal articles on the topic "THEORIES OF GRAVITY"

1

Alani, Ivo, and Osvaldo P. Santillán. "Cosmological singularity theorems forf(R) gravity theories." Journal of Cosmology and Astroparticle Physics 2016, no. 05 (2016): 023. http://dx.doi.org/10.1088/1475-7516/2016/05/023.

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2

Souza, Cynelle Olívia de. "Complements to Gravity Theories." International Journal of Innovative Science and Research Technology 5, no. 7 (2020): 673–78. http://dx.doi.org/10.38124/ijisrt20jul535.

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Gravity, electricity, magnetism and strong and weak nuclear forces form the fundamental energies and force fields for the organization of matter in the universe. All visible matter emits electromagnetic waves at specific frequencies; dark matter does not emit them. It is assumed, or else, that it can be formed by particles like the neutrino, which subtly interact with electromagnetic waves and with matter. Under the action of strong energy, the neutrino can theoretically reach speeds greater than that of light. Such an effect can occur when this particle becomes detached from electromagnetic interference, which is very difficult to observe. Sound also participates in the transport of matter and energy and can participate as the main means of coupling neutrinos and transmitting their information.
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3

Capozziello, Salvatore, and Mariafelicia De Laurentis. "Extended Theories of Gravity." Physics Reports 509, no. 4-5 (2011): 167–321. http://dx.doi.org/10.1016/j.physrep.2011.09.003.

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4

Flanagan, Éanna É. "Higher-order gravity theories and scalar–tensor theories." Classical and Quantum Gravity 21, no. 2 (2003): 417–26. http://dx.doi.org/10.1088/0264-9381/21/2/006.

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5

Myrzakulov, Nurgissa, Ratbay Myrzakulov, and Lucrezia Ravera. "Metric-Affine Myrzakulov Gravity Theories." Symmetry 13, no. 10 (2021): 1855. http://dx.doi.org/10.3390/sym13101855.

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In this paper, we review the so-called Myrzakulov Gravity models (MG-N, with N = I, II, …, VIII) and derive their respective metric-affine generalizations (MAMG-N), discussing also their particular sub-cases. The field equations of the theories are obtained by regarding the metric tensor and the general affine connection as independent variables. We then focus on the case in which the function characterizing the aforementioned metric-affine models is linear and consider a Friedmann-Lemaître–Robertson–Walker background to study cosmological aspects and applications. Historical motivation for this research is thoroughly reviewed and specific physical motivations are provided for the aforementioned family of alternative theories of gravity.
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Heisenberg, Lavinia. "Scalar-vector-tensor gravity theories." Journal of Cosmology and Astroparticle Physics 2018, no. 10 (2018): 054. http://dx.doi.org/10.1088/1475-7516/2018/10/054.

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7

Langlois, David, Michele Mancarella, Karim Noui, and Filippo Vernizzi. "Mimetic gravity as DHOST theories." Journal of Cosmology and Astroparticle Physics 2019, no. 02 (2019): 036. http://dx.doi.org/10.1088/1475-7516/2019/02/036.

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8

Day, Charles. "Testing theories of modified gravity." Physics Today 70, no. 3 (2017): 21. http://dx.doi.org/10.1063/pt.3.3485.

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9

ISENBERG, JAMES A. "WAVELESS APPROXIMATION THEORIES OF GRAVITY." International Journal of Modern Physics D 17, no. 02 (2008): 265–73. http://dx.doi.org/10.1142/s0218271808011997.

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The analysis of a general multibody physical system governed by Einstein's equations is quite difficult, even if numerical methods (on a computer) are used. Some of the difficulties — many coupled degrees of freedom, dynamic instability — are associated with the presence of gravitational waves. We have developed a number of "waveless approximation theories" (WAT's) which repress the gravitational radiation and thereby simplify the analysis. The matter, according to these theories, evolves dynamically. The gravitational field, however, is determined at each time step by a set of elliptic equations with matter sources. There is reason to believe that for many physical systems, the WAT-generated system evolution is a very accurate approximation to that generated by the full Einstein theory.
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10

Sotiriou, Thomas P., and Valerio Faraoni. "f(R)theories of gravity." Reviews of Modern Physics 82, no. 1 (2010): 451–97. http://dx.doi.org/10.1103/revmodphys.82.451.

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