Does general relativity explain gravitational effects?

1986 ◽  
Vol 69 (3) ◽  
pp. 1179-1187 ◽  
Author(s):  
A. A. Logunov ◽  
Yu. M. Loskutov ◽  
Yu. V. Chugreev
Keyword(s):  
General Relativity ◽  
Gravitational Effects

8. Gravitational waves

2018 ◽  
pp. 117-126
Author(s):  
Mike Goldsmith
Keyword(s):  
General Relativity ◽  
Gravitational Waves ◽  
Time And Space ◽  
Gravitational Effects ◽  
New Ideas ◽  
The Universe

In 1916, Einstein published his theory of general relativity, which incorporated fundamentally new ideas about the nature of gravity, including that gravitational effects take time to travel. He also showed that under some circumstances, objects lose energy by emitting ‘ripples’ in time and space: gravitational waves. ‘Gravitational waves’ explains how these waves are very weak and only the most powerful events in the Universe generate strong enough versions to be detected. Gravitational waves differ from other kinds of waves as their only effect is to cause objects to move together and then apart again. They provide a unique new window on the Universe, allowing us to look deeper and further than ever before.

Leibnizian Relationalism and the Problem of Inertia

1987 ◽  
Vol 17 (2) ◽  
pp. 437-447 ◽  
Author(s):  
Barbara Lariviere
Keyword(s):  
General Relativity ◽  
Space Time ◽  
Real Structure ◽  
Geometrical Aspect ◽  
Gravitational Effects ◽  
Single Body ◽  
Absolute Motion ◽  
Newtonian Space ◽  
Relational Concept

I consider the contrast between Leibniz's relational concept of spacetime and Einstein's special and general theories of relativity. I suggest that there are two interpretations of Leibniz's view, which I call L1 and L2. L1 amounts to saying that there is no real inertial structure to spacetime, whereas in general relativity the inertial structure is dynamical or real in Lande's sense (see Popper, 46); i.e., it can be ‘kicked’ and ‘kicks back,’ causing gravitational effects. If there is no real inertial structure to space-time then, as Weyl points out (Weyl, 105), the concept of the relative motive of several bodies has no more foundation than the concept of absolute motion for a single body. Thus, L1 seems to be untenable. L2 is a more sophisticated view which rejects the geometrical aspect of Newtonian space-time as a container for events, but accepts the existence of a real structure which determines the inertial properties of matter.

scholarly journals Gravity and Inertia in General Relativity

2021 ◽  
Author(s):  
James F. Woodward
Keyword(s):  
General Relativity ◽  
Equivalence Principle ◽  
Gravitational Effect ◽  
Inertial Forces ◽  
Gravitational Effects ◽  
Gravitational Forces ◽  
Ernst Mach ◽  
Relationship Of ◽  
The Relationship ◽  
The Universe

The relationship of gravity and inertia has been an issue in physics since Einstein, acting on an observation of Ernst Mach that rotations take place with respect to the “fixed stars”, advanced the Equivalence Principle (EP). The EP is the assertion that the forces that arise in proper accelerations are indistinguishable from gravitational forces unless one checks ones circumstances in relation to distant matter in the universe (the fixed stars). By 1912, Einstein had settled on the idea that inertial phenomena, in particular, inertial forces should be a consequence of inductive gravitational effects. About 1960, five years after Einstein’s death, Carl Brans pointed out that Einstein had been mistaken in his “spectator matter” argument. He inferred that the EP prohibits the gravitational induction of inertia. I argue that while Brans’ argument is correct, the inference that inertia is not an inductive gravitational effect is not correct. If inertial forces are gravitationally induced, it should be possible to generate transient gravitational forces of practical levels in the laboratory. I present results of a experiment designed to produce such forces for propulsive purposes.

scholarly journals Non-gravitational Effects of the Metric Field over Complex Manifolds

2021 ◽  
Author(s):  
Swagatam Sen
Keyword(s):  
General Relativity ◽  
Complex Manifold ◽  
Geodesic Equation ◽  
Complex Manifolds ◽  
Real Component ◽  
Gravitational Effects ◽  
Smooth Complex ◽  
Straight Line ◽  
Equations Of Motions

Abstract Objective of this work is to study whether some of the known non-gravitational phenomena can be explained as motion on a straight line as gravity is treated within General Relativity. To do that, we explore a metric field on a complexified manifold with holomorphic coordinates. Specifically we look into the behaviour of geodesics on such a smooth complex manifold and the path traced out by its real component. This yields a family of equations of motions in real coordinates which is shown to have deviations from usual geodesic equation and in that way expands the geodesic to capture contributions from additional fields and interactions beyond the mere gravitational ones as a function of the metric field.

scholarly journals Homothetic congruences in general relativity

2019 ◽  
Vol 34 (01) ◽  
pp. 1950001
Author(s):  
Mohsen Fathi
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Cotangent Bundle ◽  
Energy Momentum Tensor ◽  
Momentum Tensor ◽  
Electromagnetic Energy ◽  
Raychaudhuri Equation ◽  
Gravitational System ◽  
Gravitational Effects ◽  
The Common

The kinematical characteristics of distinct infalling homothetic fields are discussed by specifying the transverse subspace of their generated congruences to the energy–momentum deposit of the chosen gravitational system. This is pursued through the inclusion of the base manifold’s cotangent bundle in a generalized Raychaudhuri equation and its kinematical expressions. Exploiting an electromagnetic energy–momentum tensor as the source of non-gravitational effects, I investigate the evolution of the mentioned homothetic congruences, as they fall onto a Reissner–Nordström black hole. The results show remarkable differences to the common expectations from infalling congruences of massive particles.

scholarly journals An approach for modeling tachyons with gravitation

2019 ◽  
Vol 34 (19) ◽  
pp. 1950103
Author(s):  
Charles Schwartz
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Gravitational Field ◽  
Linear Approximation ◽  
Einstein Field Equations ◽  
Field Equations ◽  
Gravitational Effects ◽  
Cosmic Background ◽  
Light Particles ◽  
Faster Than Light

This work expands previous efforts, within the classical theories of Special and General Relativity, to include tachyons (faster-than-light particles) along with ordinary (slower-than-light) particles at any energy. The objective here is to construct a Hamiltonian that includes both the particles and the gravitational field that they produce. We do this with a linear approximation for the Einstein field equations; and we also assume a time-independent gravitational metric implied by a static picture of the particles’ motion. The resulting formulas will allow serious modeling to test the idea that cosmic background neutrinos may be tachyons, which can produce the observed gravitational effects now ascribed to some mysterious Dark Matter.

scholarly journals Reference frames and gravitational effects in the general theory of relativity

1986 ◽  
Vol 114 ◽  
pp. 177-186 ◽  
Author(s):  
O. S. Ivanitskaya ◽  
N. V. Mitskiévič ◽  
Yu. S. Vladimirov
Keyword(s):  
General Relativity ◽  
General Theory ◽  
Reference Frames ◽  
Point Of View ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
Gravitational Effects ◽  
Constructive Description ◽  
Space Objects ◽  
Temporal And Spatial

In connection with the precision growth in modern astrometry, General Relativity (GR) has become a necessary basis of celestial mechanics and of computations of ephemerides of planets and other space objects, from the point of view of both the laws of motion and the expression of measurable (observable) quantities in terms of Reference Frames (RFs) notions. In this report we summarize the RF theory in GR (in the monad as well as in the tetrad representation) and give examples of specific gravitational effects. In any theory of RFs an important element consists on separation of the RF and system-of-coordinates (SC) notions, with a constructive description of projectors onto the physical temporal and spatial directions, of the observables as invariants (scalars) under SC transformations, as well as of the transformation laws of these observables under transitions between different RFs. For a more detailed though still incomplete synopsis of the monad and tetrad methods of RF representation in GR, see our preprint [1].

SUPERCONDUCTING COSMIC STRING IN LYRA GEOMETRY

2003 ◽  
Vol 18 (01) ◽  
pp. 41-45
Author(s):  
FAROOK RAHAMAN
Keyword(s):  
General Relativity ◽  
Gravitational Field ◽  
Cosmic String ◽  
Lyra Geometry ◽  
Gravitational Effects ◽  
Moving Particle

The gravitational field of a superconducting cosmic string in the context of Lyra geometry is investigated. It has been shown that such a string has only a repulsive gravitational effects on a free moving particle. It is dissimilar to the case of a superconducting cosmic string in general relativity and Brans–Dicke theory, which gives rise to an attractive effect.

scholarly journals Long-Range Quantum Gravity

Symmetry ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1396
Author(s):  
Mariano Cadoni ◽  
Matteo Tuveri ◽  
Andrea P. Sanna
Keyword(s):  
Black Holes ◽  
General Relativity ◽  
Black Hole ◽  
Quantum Gravity ◽  
Long Range ◽  
Equivalence Principle ◽  
Quantum Criticality ◽  
Black Hole Thermodynamics ◽  
Gravitational Effects ◽  
Einstein's Equivalence Principle

It is a tantalising possibility that quantum gravity (QG) states remaining coherent at astrophysical, galactic and cosmological scales could exist and that they could play a crucial role in understanding macroscopic gravitational effects. We explore, using only general principles of General Relativity, quantum and statistical mechanics, the possibility of using long-range QG states to describe black holes. In particular, we discuss in a critical way the interplay between various aspects of long-range quantum gravity, such as the holographic bound, classical and quantum criticality and the recently proposed quantum thermal generalisation of Einstein’s equivalence principle. We also show how black hole thermodynamics can be easily explained in this framework.

Artificial satellite orbit computations

1966 ◽  
Vol 25 ◽  
pp. 363-371
Author(s):  
P. Sconzo
Keyword(s):  
Artificial Satellite ◽  
Satellite Orbit ◽  
Artificial Satellites ◽  
Orbital Elements ◽  
Differential Correction ◽  
Gravitational Effects ◽  
Short Intervals ◽  
The Subject ◽  
Introductory Discussion ◽  
Orbit Computation

In this paper an orbit computation program for artificial satellites is presented. This program is operational and it has already been used to compute the orbits of several satellites.After an introductory discussion on the subject of artificial satellite orbit computations, the features of this program are thoroughly explained. In order to achieve the representation of the orbital elements over short intervals of time a drag-free perturbation theory coupled with a differential correction procedure is used, while the long range behavior is obtained empirically. The empirical treatment of the non-gravitational effects upon the satellite motion seems to be very satisfactory. Numerical analysis procedures supporting this treatment and experience gained in using our program are also objects of discussion.

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