scholarly journals Superluminal velocity beyond the scope of application of relativity

2020 ◽  
Author(s):  
Chang-Wei Hu
Keyword(s):  
Relativistic Effects ◽  
Physical Vacuum ◽  
Theory Of Relativity ◽  
Object A ◽  
Superluminal Velocity ◽  
Superluminal Motion ◽  
Relativistic Factor ◽  
Scope Of Application ◽  
Vacuum Effects ◽  
Physical Quantities

People have carried on the extensive researches on the superluminal velocity in experiment and theory, but it is difficult to reach consensus. The biggest problem here is the theory of relativity, which shows that when a object (a matter with mass) reaches or exceeds the speed of light, whose relativistic factor will become infinite or imaginary numbers, so it is impossible to superluminal motion. In fact, although relativity is quite correct quantitative theory, but it has certain limitations. Relativistic effects are the vacuum effects, not the substantive effects. Relativistic physical quantities are only apparent physical quantities expressed through ether(physical vacuum). The substantive physical quantities of an objects are proper physical quantities, which will not vary with the velocity. Moreover the ether in superluminal velocity would lose superfluidity, and thus the superluminal velocity is beyond its scope of application of relativity. Therefore studying superluminal velocity need not scruple the restriction of relativity. Human superluminal activities will involve gravitational shielding, superluminal communication and other supertechnologies.

Geometry, philosophical issues in

2018 ◽  
Author(s):  
T.A. Ryckman
Keyword(s):  
The Other ◽  
Exact Science ◽  
Theory Of Relativity ◽  
Visual Aids ◽  
Sense Experience ◽  
Geometric Figures ◽  
Geometric Thinking ◽  
Land Surveying ◽  
Vital Component ◽  
Physical Quantities

The least abstract form of mathematics, geometry has, from the earliest Hellenic times, been accorded a curious position straddling empirical and exact science. Its standing as an empirical and approximate science stems from the practical pursuits of land surveying and measuring, from the prominence of visual aids (figures and constructions) in geometric proofs and, in the twentieth century, from Einstein’s General Theory of Relativity, which holds that the geometry of spacetime is dependent upon physical quantities. On the other hand, very early on, the symmetry and perfect regularity of certain geometric figures were taken as representative of a higher knowledge than that afforded by sense experience. And its concern with figures and constructions, rather than with number and calculation, rendered geometry amenable to axiomatic formulation and syllogistic deduction, establishing a paradigm of demonstrative knowledge which endured for two millennia. While the progress of mathematics has surmounted traditional distinctions between geometry and the mathematics of number, leaving only a heuristic role for geometric intuition, geometric thinking remains a vital component of mathematical cognition.

scholarly journals Dual Relativistic Effects in Compact Radio Sources

1988 ◽  
Vol 129 ◽  
pp. 89-90
Author(s):  
S. J. Qian
Keyword(s):  
Relativistic Effects ◽  
Radio Sources ◽  
Flux Variation ◽  
Superluminal Motion ◽  
Apparent Diameter ◽  
Superluminal Expansion

Dual relativistic effects in compact radio sources are discussed, and as an illustrative example we try to show that the observed features of the knot C4 in 3C345 (superluminal motion, superluminal expansion, apparent diameter and flux variation etc.) can be interpreted simultaneously.

scholarly journals Relativistic Effects in Reference Frames

1980 ◽  
Vol 56 ◽  
pp. 43-58 ◽  
Author(s):  
H. Moritz
Keyword(s):  
Gravitational Constant ◽  
Reference Frames ◽  
Relativistic Effects ◽  
Point Of View ◽  
Field Theories ◽  
Reference Systems ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
The Impact ◽  
Inertial Systems

AbstractThe impact of relativistic theories of space, time and gravitation on the problem of reference systems is reviewed.First, the concept of inertial systems is discussed from the point of view of the special and the general theory of relativity. Then, relativistic corrections of Doppler, laser and VLBI, and similar effects are reviewed; they are usually on the order of 10-8. Finally, the problem of a possible variation of the gravitational constant G (on the order of 10-11/year) is outlined; such a variation does not occur in special and general relativity, but is implied by certain generalized field theories which are less commonly accepted.

scholarly journals Local and global theories of relativity in flat and curved spacetimes

2020 ◽  
pp. 1-16
Author(s):  
Zahid Zakir ◽  
Keyword(s):  
Relativistic Effects ◽  
Frames Of Reference ◽  
Local Theory ◽  
Theory Of Relativity ◽  
Global Theory ◽  
Spacetime Geometry ◽  
Global Properties ◽  
Locality Principle ◽  
The Subject ◽  
First Descriptions

Special and general theories of relativity consist in describing both local and global phenomena - the first in flat, and the second in curved spacetime. In the paper it is shown that each of these two classes of relativistic effects, local and global, is universal and is the subject of a separate theory. First, descriptions in local frames of reference, related by the local Lorentz transformations, form the local theory of relativity, or local relativity (LR). The locality principle allows to apply LR to non-inertial local frames, and the equivalence principle to the local frames in gravitational field. Secondly, descriptions in global frames of reference, constructed from local frames coexisting on a common hypersurface of simultaneity, form the global theory of relativity, or global relativity (GlR). LR and GlR are based on physical coordinates and complement each other, the special and general theories of relativity were hybrids of these two theories. LR and GlR describe the local and global properties of gravity, separating the field effects from the effects of motion by different methods, such as bimetric formalism, where one metric describes geometry of the global frames, and other describes spacetime geometry. It is shown that GlR leads to a picture of collapse with formation of frozars, and also leads to a cutoff of the loop integrals of quantum fields at the Planck length. In GlR, cosmological models are built on hypersurfaces of simultaneity, where both stretching and the Doppler effect contribute to redshifts, and aberration is also taken into account. Predicted an initial violetshift removing the double redshift paradox, and this leads to the slowing time cosmology consistent with observational data.

scholarly journals Superfluid vacuum theory and deformed dispersion relations

2020 ◽  
Vol 35 (02n03) ◽  
pp. 2040032 ◽  
Author(s):  
Konstantin G. Zloshchastiev
Keyword(s):  
Dispersion Relation ◽  
Effective Mass ◽  
Relativistic Theory ◽  
Dispersion Relations ◽  
Physical Vacuum ◽  
Theory Of Relativity ◽  
Superfluid Vacuum ◽  
Complex Picture ◽  
Small Deformations ◽  
Vacuum Theory

Using the logarithmic superfluid model of physical vacuum, one can formulate an essentially quantum post-relativistic theory, which successfully recovers Einstein’s theory of relativity in low-momenta limit, but otherwise has different foundations and predictions. We present an analytical example of the dispersion relation and show that it should have a Landau form which ensures the suppression of dissipative fluctuations. We show that in the low-momentum sector of the theory, a dispersion relation becomes relativistic with small deformations, such that a photon acquires effective mass, but a much more complex picture arises at large momenta.

scholarly journals Time dependence of advection-dominated accretion flow around a rotating compact object

2020 ◽  
Vol 498 (4) ◽  
pp. 5952-5959
Author(s):  
Fahimeh Habibi
Keyword(s):  
Angular Velocity ◽  
Compact Object ◽  
Relativistic Effects ◽  
Rotation Parameter ◽  
Rotating Flow ◽  
Accretion Flow ◽  
Bernoulli Function ◽  
General Relativistic ◽  
Coefficient Of Viscosity ◽  
Physical Quantities

ABSTRACT Time evolution of advection-dominated accretion flow (ADAF) around a rotating compact object is presented. The time-dependent equations of fluid including the Coriolis force along with the centrifugal and pressure gradient forces are derived. In this research, it is assumed that angular momentum transport is due to viscous turbulence and the α-prescription is used for the kinematic coefficient of viscosity. Moreover, the general relativistic effects are neglected. In order to solve the equations, we have used a self-similar solution. The solutions show that the behaviour of the physical quantities in a dynamical ADAF is different from that for a steady accretion flow. Our results indicate that the physical quantities are dependent of rotation parameter which is defined as the ratio of the intrinsic angular velocity of the central body to the angular velocity of disc. Also, the effect of rotation parameter on these quantities is different for co and counter-rotating flows. The solution shows that by increasing the rotation parameter a, inflow–outflow region approaches the central object for co-rotating flow and moves outwards for counter-rotating flow. We find that when flow is fully advection dominated (f → 1), the entire gas has positive Bernoulli function. Also, we suggest that the Bernoulli function becomes more positive when the effect of rotation on the structure of disc decreases.

A classical relativistic hydrodynamical model for strong EM wave-spin plasma interaction

2021 ◽  
Author(s):  
Qianglin Hu ◽  
Wen Hu
Keyword(s):  
Ponderomotive Force ◽  
Lagrange Equation ◽  
Relativistic Effects ◽  
High Energy ◽  
Magnetized Plasma ◽  
Relativistic Electrons ◽  
Plasma Interaction ◽  
Spin Effects ◽  
Relativistic Factor ◽  
Time Component

Abstract Based on the covariant Lagrangian function and Euler-Lagrange equation, a set of classical fluid equations for strong EM wave-spin plasma interaction is derived. Analysis shows that the relativistic effects may affect the interaction processes by three factors: the relativistic factor, the time component of four-spin, and the velocity-field coupling. This set of equations can be used to discuss the collective spin effects of relativistic electrons in classical regime, such as astrophysics, high-energy laser-plasma systems and so on. As an example, the spin induced ponderomotive force in the interaction of strong EM wave and magnetized plasma is investigated. Results show that the time component of four-spin, which approaches to zero in nonrelativistic situations, can increase the spin-ponderomotive force obviously in relativistic situation.

scholarly journals Relativistic Option Pricing

2021 ◽  
Vol 9 (2) ◽  
pp. 32
Author(s):  
Vitor H. Carvalho ◽  
Raquel M. Gaspar
Keyword(s):  
Option Pricing ◽  
High Speed ◽  
Reference Frames ◽  
Proper Time ◽  
Relativistic Effects ◽  
Theory Of Relativity ◽  
Market Participants ◽  
Black Scholes Model ◽  
Black Scholes ◽  
Spatial Arbitrage

The change of information near light speed, advances in high-speed trading, spatial arbitrage strategies and foreseen space exploration, suggest the need to consider the effects of the theory of relativity in finance models. Time and space, under certain circumstances, are not dissociated and can no longer be interpreted as Euclidean. This paper provides an overview of the research made in this field while formally defining the key notions of spacetime, proper time and an understanding of how time dilation impacts financial models. We illustrate how special relativity modifies option pricing and hedging, under the Black–Scholes model, when market participants are in two different reference frames. In particular, we look into maturity and volatility relativistic effects.

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