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Journal articles on the topic 'Model gravitational field'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Chernitskii, Alexander A. "Induced gravitation in nonlinear field models." International Journal of Modern Physics: Conference Series 41 (January 2016): 1660119. http://dx.doi.org/10.1142/s2010194516601198.

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The description of gravitation in the framework of soliton interaction is considered for two nonlinear field models. These models are Born — Infeld nonlinear electrodynamics and so-called Born — Infeld type scalar field model. The last model can also be called the extremal space-time film one because of the specific form of the appropriate variational principle. Gravitational interaction is considered in the context of unification for all interactions of material particles. It is shown that long-range interaction of solitons of the models appears as force one and metrical one. The force intera

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2

Lukyantsev, Dmitriy, Nikolay Afanasiev, Ekaterina Kalashnikova, and Andrey Tanaev. "Mathematical Modeling of Refraction Characteristics of Electromagnetic Radiation at Stochastic Gravitational Field." Mathematical Physics and Computer Simulation 27, no. 2 (2024): 48–60. http://dx.doi.org/10.15688/mpcm.jvolsu.2024.2.4.

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Numerical-analytical modeling is used for estimation of gravitational noise influence on propagation of electromagnetic radiation at gravitational field of a group of astrophysical objects. The method bases on numerical integrate of system of light differential equations in the Euler’s form, added differential equations for calculation of statistic moments of side fluctuations of light at a picture plane of observer. The influence of gravitation was taken into account by introducing of the effective refraction index of vacuum, expressed through a gravitational potential. Visions about spatial

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3

Krot, Alexander M. "Derivation of field equations and investigation of gravitational waves in the gravitational field of a condensing cosmogonical body based on the statistical theory." Journal of Physics: Conference Series 3027, no. 1 (2025): 012004. https://doi.org/10.1088/1742-6596/3027/1/012004.

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Abstract This paper considers the statistical theory of cosmogonical body formation in order to derive field equations and investigate gravitational waves in the gravitational field of a condensing cosmogonical body. The models and evolution equations of the statistical mechanics have been proposed in this theory, while well-known problems of gravitational condensation of infinitely spread cosmic media have been solved on the basis of the proposed statistical model of a spheroidal body. Within the framework of the statistical theory, the presence of an ethereal medium (or a dark matter) around

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4

DANEHKAR, ASHKBIZ. "ON THE SIGNIFICANCE OF THE WEYL CURVATURE IN A RELATIVISTIC COSMOLOGICAL MODEL." Modern Physics Letters A 24, no. 38 (2009): 3113–27. http://dx.doi.org/10.1142/s0217732309032046.

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The Weyl curvature includes the Newtonian field and an additional field, the so-called anti-Newtonian. In this paper, we use the Bianchi and Ricci identities to provide a set of constraints and propagations for the Weyl fields. The temporal evolutions of propagations manifest explicit solutions of gravitational waves. We see that models with purely Newtonian field are inconsistent with relativistic models and obstruct sounding solutions. Therefore, both fields are necessary for the nonlocal nature and radiative solutions of gravitation.

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Chen, Yu-Jie, Shi-Lin Li, Yu-Zhu Chen, Wen-Du Li, and Wu-Sheng Dai. "Gravitational constant model and correction." Journal of Mathematical Physics 63, no. 11 (2022): 112503. http://dx.doi.org/10.1063/5.0095583.

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We construct a model for considering the quantum correction of the gravitational constant. In the model, the gravitational constant originates from a coupling between the gravitational field and a scalar field. If the scalar field, as it should be in the real physical world, is a quantum field, the gravitational constant will have a quantum correction. The quantum correction, generally speaking, varies with spacetime coordinates. Therefore, the gravitational constant is no longer a constant. In different spacetime, the quantum correction is different, for the coupling in different spacetime is

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6

Fedosin, Sergey G. "The Gravitational Field in the Relativistic Uniform Model within the Framework of the Covariant Theory of Gravitation." International Letters of Chemistry, Physics and Astronomy 78 (April 12, 2018): 39–50. https://doi.org/10.18052/www.scipress.com/ILCPA.78.39.

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For the relativistic uniform system with an invariant mass density the exact expressions are determined for the potentials and strengths of the gravitational field, the energy of particles and fields. It is shown that, as in the classical case for bodies with a constant mass density, in the system with a zero vector potential of the gravitational field, the energy of the particles, associated with the scalar field potential, is twice as large in the absolute value as the energy defined by the tensor invariant of the gravitational field. The problem of inaccuracy of the use of the field’s

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Fedosin, Sergey G. "The Gravitational Field in the Relativistic Uniform Model within the Framework of the Covariant Theory of Gravitation." International Letters of Chemistry, Physics and Astronomy 78 (April 2018): 39–50. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.78.39.

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For the relativistic uniform system with an invariant mass density the exact expressions are determined for the potentials and strengths of the gravitational field, the energy of particles and fields. It is shown that, as in the classical case for bodies with a constant mass density, in the system with a zero vector potential of the gravitational field, the energy of the particles, associated with the scalar field potential, is twice as large in the absolute value as the energy defined by the tensor invariant of the gravitational field. The problem of inaccuracy of the use of the field’s stres

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8

Fedosin, Sergey G. "The Gravitational Field in the Relativistic Uniform Model within the Framework of the Covariant Theory of Gravitation." International Letters of Chemistry, Physics and Astronomy 78 (April 10, 2018): 39–50. http://dx.doi.org/10.56431/p-152cfg.

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For the relativistic uniform system with an invariant mass density the exact expressions are determined for the potentials and strengths of the gravitational field, the energy of particles and fields. It is shown that, as in the classical case for bodies with a constant mass density, in the system with a zero vector potential of the gravitational field, the energy of the particles, associated with the scalar field potential, is twice as large in the absolute value as the energy defined by the tensor invariant of the gravitational field. The problem of inaccuracy of the use of the field’s stres

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9

Fedosin, Sergey G. "The charged component of the vacuum field as the source of electric force in the modernized Le Sage's model." Journal of Fundamental and Applied Sciences 8, no. 3 (2016): 971–1020. https://doi.org/10.5281/zenodo.845357.

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The formula is derived for the electric force inside a uniformly charged spherical body, as well as for the Coulomb force between the charged bodies from the standpoint of the model of the vacuum field with charged particles. The parameters of the fluxes of charged particles are estimated, including the energy density, energy flux and cross section of interaction with the charged matter. The energy density of gravitons in the Le Sage’s gravitation model is expressed in terms of the strong gravitational constant. The charge to mass ratio is determined for the charged particles that make u

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10

Greyber, Howard D. "The Strong Magnetic Field Galactic Center-AGN-Quasar Model." Symposium - International Astronomical Union 136 (1989): 335–40. http://dx.doi.org/10.1017/s007418090018670x.

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The energy storage and dynamics at the center of galaxies is explained using a new construct, the gravitationally bound current loop (GBCL), produced when the galaxy formed under gravitational collapse. Thin toroidal plasma around the slender intense relativistic current loop is bound to it by the Maxwell “frozen-field” condition, and also binds gravitationally to the central object (presumably a black hole). The Strong Magnetic Field model (SMF) explains directly the Milky Way (MW) galactic center radio observations of a vertical magnetic field perpendicular to the galactic disk and the exten

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11

Pinto, Fabrizio. "Efimov physics in curved spacetime: Field fluctuations and exotic matter." International Journal of Modern Physics D 27, no. 14 (2018): 1847001. http://dx.doi.org/10.1142/s0218271818470016.

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Several experimental detections have demonstrated the existence of Borromean states predicted by Vitaly Efimov within a nuclear physics context, that is, trimers bound despite the absence of bound states of any of the two-body subsystems. I show that novel Efimov Physics is expected in gravitationally polarizable nonbaryonic dark matter beyond the Standard Model with van der Waals-like forces driven by quantum gravitational fluctuations. I also discuss ground and space-based tests of spacetime curvature effects on weakly bound, highly diffuse quantum three-body systems with standard electrodyn

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12

Kassenova, L. G., G. S. Yensebaeva, and G. Zh Shuitenov. "CONSTRUCTION OF A PHYSICAL AND MATHEMATICAL MODEL OF THE GRAVITATIONAL FIELD." BULLETIN Series of Physics & Mathematical Sciences 73, no. 1 (2021): 91–95. http://dx.doi.org/10.51889/2021-1.1728-7901.13.

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The problem of gravitational field physics is to identify the relationship between the gravitational field and the expansion of the space-time continuum. Therefore, the creation of models, the study of which makes it possible to identify these relationships and express them in formulas, is relevant. In the modern theory of the gravitational field, small quantities appear, which are neglected in the derivation of formulas of practical application. This paper presents a model of the gravitational field that combines quantum properties with the expansion of the space-time continuum. Also, using a

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Pa´dua, K. G. O. "Nonisothermal Gravitational Equilibrium Model." SPE Reservoir Evaluation & Engineering 2, no. 02 (1999): 211–17. http://dx.doi.org/10.2118/55972-pa.

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Summary This work presents a new computational model for the non-isothermal gravitational compositional equilibrium. The works of Bedrikovetsky [Mathemathical Theory of Oil and Gas Recovery, Kluwer Academic Publishers, London, (1993)] (gravity and temperature) and of Whitson and Belery ("Compositional Gradients in Petroleum Reservoirs," paper SPE 28000, presented at the 1994 University of Tulsa Centennal Petroleum Engineering Symposium, Tulsa, 29-31 August) (algorithm) are the basis of the mathematical formulation. Published data and previous simplified models validate the computational proced

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Isgаndаrov, E., R. Hushanov, and N. Shahbazli. "DIGITAL MODELING OF GRAVITY-MAGNETIC ANOMALIES." Sciences of Europe, no. 164 (May 14, 2025): 26–32. https://doi.org/10.5281/zenodo.15401264.

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The article is devoted to the issue of modeling gravitational and magnetic anomalies, which is very important in solving the main - geological problem of gravity and magnetic exploration. When solving complex geological and geophysical problems using modern digital methods of processing and interpretation, it is very important to correctly specify the physical and geological model of the geological object under study. In a particular case, a more accurate assessment of the gravitational effects of model geological structures is very important. For this, homogeneous bodies of regular shape are

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Keyzerov, Sergey, Igor Volobuev, and Edward Rakhmetov. "Nonlinear interactions of the radion field." EPJ Web of Conferences 222 (2019): 04011. http://dx.doi.org/10.1051/epjconf/201922204011.

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We study the Randall-Sundrum model with two branes. The Standard Model fields are localized on the brane with a negative tension, the gravitational field and scalar Goldberg-Wise field propagate in the multidimensional bulk. For this model we construct the Lagrangian for the scalar fluctuations of the gravitational and scalar fields above a background solution. We obtain an effective four-dimensional Lagrangian, which contains nonlinear self-interaction terms of the radion field up to the fourth order and nonlinear interactions of the radion and the Standard Model fields.

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SHAPIRO, I. L. "THE INTERACTION OF QUANTIZED MATTER FIELDS WITH TORSION AND METRIC: NJL MODEL." Modern Physics Letters A 09, no. 08 (1994): 729–33. http://dx.doi.org/10.1142/s021773239400054x.

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We consider the interaction of matter fields with classical gravitational background in the framework of Nambu-Jona-Lasinio (NJL) model. Gravity includes not only metric but also independent torsion field. The renormalization group analysis shows that the matter-torsion interaction increases in a strong gravitational field and disappears at low energies.

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17

Vo, On Van. "A NON- STATIC COSMOLOGICAL MODEL IN THE VECTOR MODEL FOR GRAVITATIONAL FIELD." Science and Technology Development Journal 14, no. 1 (2011): 78–84. http://dx.doi.org/10.32508/stdj.v14i1.1887.

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In this paper, based on the vector model for gravitational field we obtained the modified Friedman equations, which were similar to the classical Friedman equations but were added a term of energy – momentum tensor of gravitational field. Non- static flat cosmological model in this model was similar to General Theory of Relativity (GTR) ‘s model but the expansive rate in the vacuum age was difference with General Theory of Relativity ’s model.

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Winterberg, F. "Maxwell's Equations and Einstein-Gravity in the Planck Aether Model of a Unified Field Theory." Zeitschrift für Naturforschung A 45, no. 9-10 (1990): 1102–16. http://dx.doi.org/10.1515/zna-1990-9-1008.

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Abstract In the Planck aether substratum model it is assumed that space is densely filled with both positive and negative Planck masses described by a nonlinear nonrelativistic operator field equation. With-out expenditure of energy this substratum can form a lattice of vortex rings, with the vortex core radius equal the Planck length. The vortex ring radius is determined by a universal minimum energy quantum Reynolds number, making the ring radius and lattice spacing about 10 3 -10 4 times larger than the Planck length. The zero point fluctuations of the Planck masses bound in the vortex fila

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19

Agop, M., C. Gh Buzea, V. Griga, et al. "Gravitational Paramagnetism, Diamagnetism and Gravitational Superconductivity." Australian Journal of Physics 49, no. 6 (1996): 1063. http://dx.doi.org/10.1071/ph961063.

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In the weak field approximation to the gravitational field equations, we study gravitational paramagnetism and diamagnetism, the gravitational Meissner effect and gravitational superconductivity. The spontaneous symmetry breaking corresponds to crossing from closed geodesics to open ones, and to the existence of a critical temperature in the frame of a gauge model at finite temperature. In this later case one can obtain expressions giving the dependence of several superconducting parameters on temperature.

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20

Penner, A. Raymond. "A model for the source of the baryonic Tully–Fisher relationship and the Pioneer anomaly." Canadian Journal of Physics 89, no. 8 (2011): 841–47. http://dx.doi.org/10.1139/p11-063.

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It is shown that basic hypotheses regarding the nature of the source of the observed gravitational anomalies lead naturally to both the baryonic Tully–Fisher relationship and the Pioneer anomaly. A theory where the gravitational field of a mass induces a gravitational field contribution from the cosmos fits well with these hypotheses. In line with this, a theory is presented where particle–antiparticle pairs exist throughout the cosmos, with a lifetime in accordance with Heisenberg’s uncertainty principle. These particle–antiparticle pairs are displaced in the presence of a gravitational field

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21

Klapchenko, Vasily, Irina Kuznetsova, and Grygorii Krasnianskyi. "Materiality of the gravitational field and development of physical models of gravitation." Management of Development of Complex Systems, no. 55 (September 25, 2023): 166–74. http://dx.doi.org/10.32347/2412-9933.2023.55.166-174.

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Based on the idea of the materiality of the gravitational field, two physical models of gravity are proposed: Model 1 – the equivalent scheme of gravistatics and Model 2 – the vacuum profile of withdrawals from the physical vacuum in the region of a black hole. Model 1 clearly illustrates the fundamental difference between electrostatic interaction and gravity. In particular, it confirmed the validity of the Mach principle, the presence of a double action of the gravitational field and the huge (but not infinite!) gravity propagation speed υg ~ 1069 m/s. Model 2 made it possible to distinguish

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22

Stávek, Jiří. "The Descartes Code (Spin Orbital Rotation of Photons)–II. The Gravitational Redshift." European Journal of Applied Physics 6, no. 1 (2024): 14–23. http://dx.doi.org/10.24018/ejphysics.2024.6.1.296.

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A new alternative model to the Schwarzschild’s solution of the Einstein's gravitational theory is presented. Descartes’s code is the old color theory (published in 1637) based on the rotation of “light globules”, however, it was rejected by Newton in 1672. In this model, the photon spin-orbital speed is modified by the gravitational field. The formulae for the wavelength, frequency, local time, momentum, energy, and temperature of photons in the gravitational field are identical in the first order both for the Schwarzschild solution and Descartes’ code. To experimentally determine the predicti

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Stávek, Jiří. "How to Interpret Gravitational Events in the Newton´s Rotating Bucket? (Gravitational Phonons)." European Journal of Applied Physics 4, no. 2 (2022): 1–7. http://dx.doi.org/10.24018/ejphysics.2022.4.2.159.

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The Newton´s rotating bucket with gravitational events occurring in that bucket is a starting point for any new model describing gravitational situations and serves as a “filter” for any proposed gravitational model. The topic of this contribution is to describe the self-organization of H2O molecules in the rotating bucket based on the Einstein-Shannon (ES) log-normal distribution of gravitationally redshifted velocities of H2O molecules. The joint co-operation of the Earth´s gravitational field with the centrifugal force acts as that “hidden” organizing agent. H2O molecules transfer the gravi

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Ganagina, Irina G., Darya S. Chelnokova, and Denis N. Goldobin. "CREATION OF A QUASIGEOID MODEL ON A LOCAL SECTION BY GIS MEANS." Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 25, no. 3 (2020): 14–25. http://dx.doi.org/10.33764/2411-1759-2020-25-3-14-25.

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The capabilities of fully functional geographic information systems used in various fields make it possible to simulate the characteristics of the gravitational field, presenting measuring information in the form of continuous surfaces, thereby expanding the area of use of data on the Earth's gravitational field. An important stage of visualization is the choice of a method of interpolating data that provides the highest possible accuracy in creating a digital model of the studied characteristic of the gravitational field. The authors developed a technology for choosing the optimal method for

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FANI, SOMAYEH, and KAMRAN KAVIANI. "FROM DIMENSIONAL REDUCTION OF 4d SPIN FOAM MODEL TO ADDING NON-GRAVITATIONAL FIELDS TO 3d SPIN FOAM MODEL." International Journal of Geometric Methods in Modern Physics 11, no. 01 (2013): 1450002. http://dx.doi.org/10.1142/s0219887814500029.

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A Kaluza–Klein-like approach for a 4d spin foam model is considered. By applying this approach to a model based on group field theory in 4d (TOCY model), and using the Peter–Weyl expansion of the gravitational field, reconstruction of new non-gravitational fields and interactions in the action are found. The perturbative expansion of the partition function produces graphs colored with SU(2) algebraic data, from which one can reconstruct a 3d simplicial complex representing space-time and its geometry (like in the Ponzano–Regge formulation of pure 3d quantum gravity), as well as the Feynman gra

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INAGAKI, T., S. D. ODINTSOV, and YU I. SHIL'NOV. "DYNAMICAL SYMMETRY BREAKING IN THE EXTERNAL GRAVITATIONAL AND CONSTANT MAGNETIC FIELDS." International Journal of Modern Physics A 14, no. 04 (1999): 481–503. http://dx.doi.org/10.1142/s0217751x99000245.

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We investigate the effects of the external gravitational and constant magnetic fields to the dynamical symmetry breaking. As simple models of the dynamical symmetry breaking we consider the Nambu–Jona-Lasinio (NJL) model and the supersymmetric Nambu–Jona-Lasinio (SUSY NJL) model nonminimally interacting with the external gravitational field and minimally interacting with constant magnetic field. The explicit expressions for the scalar and spinor Green functions are found to the first order in the space–time curvature and exactly for a constant magnetic field. We obtain the effective potential

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Goździewski, Krzysztof, Andrzej J. Maciejewski, and Philip J. Stooke. "A model of the gravitational field of Amalthea." Earth, Moon, and Planets 64, no. 3 (1994): 243–64. http://dx.doi.org/10.1007/bf00572151.

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28

Tapia, Victor, Dennis K. Ross, Az-Eddine Marrakchi, and Mauricio Cataldo. "Renormalizable conformally invariant model for the gravitational field." Classical and Quantum Gravity 13, no. 12 (1996): 3261–67. http://dx.doi.org/10.1088/0264-9381/13/12/017.

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Denisova, I. P. "A laser-source model of the gravitational field." Theoretical and Mathematical Physics 116, no. 3 (1998): 1108–12. http://dx.doi.org/10.1007/bf02557151.

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30

Winterberg, F. "Cosmological Implications of the Planck Aether Model for a Unified Field Theory." Zeitschrift für Naturforschung A 47, no. 12 (1992): 1217–26. http://dx.doi.org/10.1515/zna-1992-1207.

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Abstract In the previously proposed Planck aether model of a unified theory, the vacuum ground state consists of a dense assembly of positive and negative Planck masses obeying an exactly nonrelativistic law of motion. The Planck aether is superfluid, and it can without expenditure of energy form a tangle of quantized vortex filamants permitting the transmission of two types of waves: One associated with a symmetric displacement of the vortex lattice leading to gravitational waves, and one associated with an antisymmetric displacement leading to electromagnetic waves. Dirac spinors are explain

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Chernitskii, Alexander. "Gravitation in Unified Scalar Field Theory." Universe 7, no. 1 (2021): 11. http://dx.doi.org/10.3390/universe7010011.

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The scalar field of space-time film is considered as unified fundamental field. The field model under consideration is the space-time generalization of the model for a two-dimensional thin film. The force and metrical interactions between solitons are considered. These interactions correspond to the electromagnetic and gravitational interactions respectively. The metrical interaction and its correspondence to the gravitational one are considered in detail. The practical applications of this approach are briefly discussed.

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Chernitskii, Alexander A. "Gravitation in Unified Scalar Field Theory." Universe 7, no. 1 (2021): 11. http://dx.doi.org/10.3390/universe7010011.

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The scalar field of space-time film is considered as unified fundamental field. The field model under consideration is the space-time generalization of the model for a two-dimensional thin film. The force and metrical interactions between solitons are considered. These interactions correspond to the electromagnetic and gravitational interactions respectively. The metrical interaction and its correspondence to the gravitational one are considered in detail. The practical applications of this approach are briefly discussed.

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Liu, Longgeng, and Guangchun Luo. "Routing optimization in networks based on traffic gravitational field model." International Journal of Modern Physics B 31, no. 11 (2017): 1750074. http://dx.doi.org/10.1142/s0217979217500746.

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For research on the gravitational field routing mechanism on complex networks, we further analyze the gravitational effect of paths. In this study, we introduce the concept of path confidence degree to evaluate the unblocked reliability of paths that it takes the traffic state of all nodes on the path into account from the overall. On the basis of this, we propose an improved gravitational field routing protocol considering all the nodes’ gravities on the path and the path confidence degree. In order to evaluate the transmission performance of the routing strategy, an order parameter is introd

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Buchbinder, I. L., T. Inagaki, and S. D. Odintsov. "Supersymmetric Nambu–Jona-Lasinio Model in an External Gravitational Field." Modern Physics Letters A 12, no. 30 (1997): 2271–77. http://dx.doi.org/10.1142/s021773239700234x.

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We investigate the effect of an external gravitational fields to the chiral symmetry breaking in the supersymmetric (SUSY) Nambu–Jona-Lasinio (NJL) model coupled to gravity in a non-supersymmetric way. Evaluating the effective potential in the leading order of the 1/Nc-expansion and in the linear curvature approximation, it is possible to have the chiral symmetry breaking in the SUSY NJL model in an external gravitational fields. In the broken phase the dynamically generated mass is analytically and numerically calculated.

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Larson, D. J. "The quantum luminiferous aether." Physics Essays 37, no. 1 (2024): 9–30. http://dx.doi.org/10.4006/0836-1398-37.1.9.

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A solid, two-component, quantum luminiferous aether is proposed to exist. Simple postulates are hypothesized, along with some physical laws and assignments. Derivations then lead to the equations of electrodynamics (Maxwell’s equations and the Lorentz force equation), Newton’s law of universal gravitation, and to two field-masses. The theory is shown to successfully meet the classic tests of general relativity: calculations for the advance of the perihelia, the Shapiro effect, and the gravitational redshift agree with experiment, and the experimental result concerning the bending of light in g

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Osetrin, Konstantin E., Vladimir Y. Epp, and Altair E. Filippov. "Exact Model of Gravitational Waves and Pure Radiation." Symmetry 16, no. 11 (2024): 1456. http://dx.doi.org/10.3390/sym16111456.

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An exact non-perturbative model of a gravitational wave with pure radiation is constructed. It is shown that the presence of dust matter in this model contradicts Einstein’s field equations. The exact solution to Einstein’s equations for gravitational wave and pure radiation is obtained. The trajectories of propagation and the characteristics of radiation are found. For the considered exact model of a gravitational wave, a retarded time equation for radiation is obtained. The obtained results are used to construct an exact model of gravitational wave and pure radiation for the Bianchi type IV

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Fedosin, Sergey G. "Estimation of the physical parameters of planets and stars in the gravitational equilibrium model." Canadian Journal of Physics 94, no. 4 (2016): 370–79. http://dx.doi.org/10.1139/cjp-2015-0593.

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The motion equations of matter in a gravitational field, acceleration field, pressure field, and other fields are considered based on the field theory. This enables us to derive simple formulas in the framework of the gravitational equilibrium model, which allow us to estimate the physical parameters of cosmic bodies. The acceleration field coefficient, η, and the pressure field coefficient, σ, are a function of the state of matter, and their sum is close in magnitude to the gravitational constant, G. In the presented model the dependence is found of the internal temperature and pressure on th

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Galtier, Sébastien, Jason Laurie, and Sergey V. Nazarenko. "A Plausible Model of Inflation Driven by Strong Gravitational Wave Turbulence." Universe 6, no. 7 (2020): 98. http://dx.doi.org/10.3390/universe6070098.

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It is widely accepted that the primordial universe experienced a brief period of accelerated expansion called inflation. This scenario provides a plausible solution to the horizon and flatness problems. However, the particle physics mechanism responsible for inflation remains speculative with, in particular, the assumption of a scalar field called inflaton. Furthermore, the comparison with the most recent data raises new questions that encourage the consideration of alternative hypotheses. Here, we propose a completely different scenario based on a mechanism whose origins lie in the nonlineari

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WANG, ANZHONG. "GRAVITATIONAL COLLAPSE OF THICK DOMAIN WALLS: AN ANALYTIC MODEL." Modern Physics Letters A 09, no. 39 (1994): 3605–9. http://dx.doi.org/10.1142/s0217732394003440.

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An exact solution to the Einstein field equations is found, which represents the gravitational collapse of a thick domain wall. During the collapse, the wall emits gravitational radiation, which can be measured as a gravitational pp wave at the spacelike infinity. The time-reversed solution represents an expanding universe, in which a domain wall resides. It is shown explicitly that such a wall can be inflated away.

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GREENSITE, J. "A MODEL OF QUANTUM GRAVITATIONAL COLLAPSE." International Journal of Modern Physics A 06, no. 15 (1991): 2693–706. http://dx.doi.org/10.1142/s0217751x91001301.

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Some issues in the quantum mechanics of gravitational collapse are discussed in the framework of a simple minisuperspace model, consisting of a Friedman metric coupled to a massless scalar field. The model illustrates the role of intrinsic time coordinates in parametrizing gravitational collapse through a singularity, and the relevance of quantizing the metric scale factor over an infinite, rather than half-infinite, range.

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UNNIKRISHNAN, SANIL, and T. R. SESHADRI. "COSMIC ACCELERATION IN A MODEL OF SCALAR–TENSOR GRAVITATION." International Journal of Modern Physics D 17, no. 11 (2008): 2007–15. http://dx.doi.org/10.1142/s0218271808013674.

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In this paper we consider a model of the scalar–tensor theory of gravitation, in which the scalar field ϕ determines the gravitational coupling G and has a Lagrangian of the form [Formula: see text]. We study the cosmological consequence of this theory in the matter-dominated era and show that it leads to a transition from an initial decelerated expansion to an accelerated expansion phase at the present epoch. Using observational constraints, we see that the effective equation of state today for the scalar field turns out to be pϕ = wϕρϕ, with wϕ = -0.88, and that the transition to an accelera

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NOVELLO, M., and V. A. DE LORENCI. "NONLINEAR NONLOCAL THEORY OF GRAVITY." Modern Physics Letters A 10, no. 10 (1995): 807–12. http://dx.doi.org/10.1142/s0217732395000855.

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Deser and Laurent (1968) explored an alternative linear theory for spin-two field using a nonlocal divergence-free projection operator on the matter energy-momentum tensor. Here, we extend this theory by including nonlinearity of the gravitational field. We show that such extended model satisfy the four standard tests of weak gravity. The consequences for strong gravitational fields are under examination.

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Edward S. Tannous, Edward S. Tannous. "Gravitational Energy Levels: Part Two: مستويات طاقة الجاذبية: الجزء الثاني". Journal of natural sciences, life and applied sciences 5, № 4 (2021): 62–47. http://dx.doi.org/10.26389/ajsrp.s190721.

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We present here a model that explains in a simple, easy and summarized manner, the values, meaning and reasons for the force of gravity, using simple physical tools. According to this model, a gravitational field actually creates different energy levels, similar to the atom, around the center of mass of the gravitational source, and a transition between the energy levels results in the creation of the force of weight acting on each small body which is in the gravitational field. As the body approaches a gravitational field, its energy value decreases to a value of m0u2(R), proportional to the

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V.B., Nepiklonov, Spiridonova E.S., and Maksimova M.V. "Fractal analysis of global model dynamics Earth's gravitational field." Geodesy and Aerophotosurveying 64, no. 4 (2020): 380–90. http://dx.doi.org/10.30533/0536-101x-2020-64-4-380-390.

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Работа посвящена вопросам анализа динамики системы глобальных моделей гравитационного поля Земли в виде сферических гармоник геопотенциала, включая ежегодный рост количества моделей, темпы выпуска новых моделей, повышение детальности представления гравитационного поля Земли. Процессы, отражающие эту динамику, представлены виде временных рядов. Эти временные ряды были исследованы с использованием фрактального анализа. Сопоставлены оценки их фрактальной размерности, полученные различными методами. Всеми методами подтверждена персистентность (устойчивость) роста количества моделей. Большинством м

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Lemoine, F., N. Pavlis, S. Kenyon, R. Rapp, E. Pavlis, and B. Chao. "New high-resolution model developed for earth's gravitational field." Eos, Transactions American Geophysical Union 79, no. 9 (1998): 113. http://dx.doi.org/10.1029/98eo00076.

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Thong, N. C., and E. W. Grafarend. "A spheroidal harmonic model of the terrestrial gravitational field." manuscripta geodaetica 14, no. 4 (1989): 285–304. http://dx.doi.org/10.1007/bf03655218.

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Ji, Wenfei, Tonghai Jiang, Meng Wang, Xinyu Tang, Guang Chen, and Shan Yang. "Online Knowledge Learning Model Based on Gravitational Field Theory." Applied Sciences 9, no. 15 (2019): 3195. http://dx.doi.org/10.3390/app9153195.

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Currently, low-dimensional embedded representation learning models are the mainstream approach in knowledge representation research, due to ease of calculation and ability to utilize the spatial relationship between knowledge areas, which benefit from static knowledge learning. However, these models cannot update and learn knowledge online. Although using update strategies to update the knowledge base has been proposed by some scholars, this still requires retraining of knowledge and does not use the previous learning parameters and models. TransOnLine, an online knowledge learning method base

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Hut, Piet. "Binary Formation and Interactions with Field Stars." Symposium - International Astronomical Union 113 (1985): 231–49. http://dx.doi.org/10.1017/s0074180900147412.

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Binaries provide an energy source in dense stellar systems. Exothermic gravitational interactions in star clusters can play a role similar to that of nuclear reactions in single stars. These gravitational interactions can be modeled in a laboratory setting, in the form of numerical binary-single star and binary-binary scattering experiments. Gravitational cross sections obtained this way can be applied to model star cluster evolution, just as nuclear cross sections are used as input data in stellar evolution calculations. References are given to detailed descriptions of gravitational cross sec

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Curran, Michael J. "A proposal for an electrical connection between the gravitational field and light." Physics Essays 33, no. 3 (2020): 271–75. http://dx.doi.org/10.4006/0836-1398-33.3.271.

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Based on well-established equations, we provide evidence of an electrical connection between the gravitational field and light. Each is modeled using the inductance‐capacitance ( <mml:math display="inline"> <mml:mrow> <mml:mi>L</mml:mi> <mml:mi>C</mml:mi> </mml:mrow> </mml:math> ) circuit as the building block. A proposed direct photon force (not a pressure and not by means of a force carrier), the relationship between the speed of light and gravity, the frequency and wavelength of gravitational waves, gravitational redshift, the trajectory of pl

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LEE, CHUL H. "WEAK GRAVITATIONAL FIELD AROUND A GLOBAL TEXTURE." Modern Physics Letters A 09, no. 21 (1994): 1905–10. http://dx.doi.org/10.1142/s0217732394001751.

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Weak gravitational field in the asymptotic region far outside the core of a global texture is investigated without the nonlinear σ-model approximation. We solve the linearized Einstein field equations with the stress-energy tensor contributed by a spherically symmetric global texture to obtain the asymptotic form of the metric. It is shown that, even in this more general case than that of the self-similar solution in the nonlinear σ-model approximation, the metric of the spatial hyperspace in the asymptotic region is that of a flat space with a deficit solid angle whose magnitude is independen

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