scholarly journals On the Relativity of the Speed of Light

2020 ◽  
Author(s):  
XD Dongfang
Keyword(s):  
Reference Frame ◽  
Relative Velocity ◽  
Propagation Speed ◽  
Frame Of Reference ◽  
Constant Speed ◽  
Inertial Reference Frame ◽  
Speed Of Light ◽  
Velocity Of Light ◽  
Relative Variable ◽  
Variable Light

Einstein's assumption that the speed of light is constant is a fundamental principle of modern physics with great influence. However, the nature of the principle of constant speed of light is rarely described in detail in the relevant literatures, which leads to a deep misunderstanding among some readers of special relativity. Here we introduce the unitary principle, which has a wide application prospect in the logic self consistency test of mathematics, natural science and social science. Based on this, we propose the complete space-time transformation including the Lorentz transformation, clarify the definition of relative velocity of light and the conclusion that the relative velocity of light is variable, and further prove that the relative variable light speed is compatible with Einstein's constant speed of light. The specific conclusion is that the propagation speed of light in vacuum relative to the observer's inertial reference frame is always constant $c$, but the propagation speed of light relative to any other inertial reference frame which has relative motion with the observer is not equal to the constant $c$; observing in all inertial frame of reference, the relative velocity of light propagating in the same direction in vacuum is $0$, while that of light propagating in the opposite direction is $2c$. The essence of Einstein's constant speed of light is that the speed of light in an isolated reference frame is constant, but the relative speed of light in vacuum is variable. The assumption of constant speed of light in an isolated frame of reference and the inference of relative variable light speed can be derived from each other.

scholarly journals Spacetime coordinates in the geocentric reference frame

1986 ◽  
Vol 114 ◽  
pp. 269-276 ◽  
Author(s):  
M. Fujimoto ◽  
E. Grafarend
Keyword(s):  
Solar System ◽  
Gravity Field ◽  
Reference Frame ◽  
Relative Velocity ◽  
Proper Time ◽  
Frame Of Reference ◽  
Earth Surface ◽  
Riemann Geometry ◽  
The Earth ◽  
Integrating Factors

A geocentric relativistic reference frame is established which is close to the conventional non-relativistic equatorial frame of reference. Within post-Newtonian approximation the worldline of the geocentre is used to connect points by spacelike geodesics on the equal proper time hypersurface and to establish a properly chosen tetrad reference frame. Points on the earth surface and near the earth-space are coordinated making use of the Frobenius matrix of integrating factors which connects the geocentric orthonormal tetrad with the tangent spacetime of relativistic pseudo-Riemann geometry. The gravity field of the earth and its relative velocity with respect to the solar system barycentre cause coordinate effects of the order of 10 cm for topocentric point positioning.

Superluminal Lorentz transformations

2021 ◽  
Vol 34 (1) ◽  
pp. 44-50
Author(s):  
Giorgio Capezzali
Keyword(s):  
Reference Frame ◽  
Physical Meaning ◽  
Lorentz Transformations ◽  
Inertial Reference Frame ◽  
Linear Transformations

In this article, linear transformations of coordinates to a superluminal inertial reference frame are presented. Even if there is no need to use imaginary numbers to maintain c invariant, these functions are just intended as a mathematical curiosity not necessarily having a real physical meaning. Possible applications to our world, if any, are left to the reader.

scholarly journals On the Support that the Special and General Theories of Relativity Provide for Rock’s Argument Concerning Induced Self-Motion and Vice Versa

2020 ◽  
Author(s):  
Douglas Michael Snyder
Keyword(s):  
Reference Frame ◽  
Empirical Work ◽  
Special Theory ◽  
The Other ◽  
Relativity Theory ◽  
Inertial Reference Frame ◽  
Theory Of Relativity ◽  
Special Theory Of Relativity ◽  
Other Hand ◽  
Self Motion

Though Einstein and other physicists recognized the importance of an observer being at rest in an inertial reference frame for the special theory of relativity, the supporting psychological structures were not discussed much by physicists. On the other hand, Rock wrote of the factors involved in the perception of motion, including one’s own motion. Rock thus came to discuss issues of significance to relativity theory, apparently without any significant understanding of how his theory might be related to relativity theory. In this paper, connections between Rock’s theory on the perception of one’s own motion, as well as empirical work supporting it, and relativity theory are explored. Paper available at: https://arxiv.org/abs/physics/9908025v1 .

scholarly journals Art and Science Einstein’s Universe via Art

2018 ◽  
pp. 1-3
Keyword(s):  
Relative Velocity ◽  
Speed Of Light ◽  
Art And Science

The essence of Einstein’s world lies in the concept of relativity. He described it once in the following way: "When you sit with a nice girl for two hours, it seems like two minutes. When you sit on a hot stove for two minutes, it seems like two hours; that's relativity he said." Einstein also boldly stated that there are no absolute quantities, that the magnitude of quantities depends on the relative velocity between an object and the observer, and that every event and measurement is viewed differently depending on the observer's velocity. However, the only measurement that remains constant is the speed of light C in vacuum.

scholarly journals The Differential Astrometric Reference Frame on short timescales in the Gaia Era

2017 ◽  
Vol 12 (S330) ◽  
pp. 79-80
Author(s):  
Ummi Abbas ◽  
Beatrice Bucciarelli ◽  
Mario G. Lattanzi ◽  
Mariateresa Crosta ◽  
Mario Gai ◽  
...  
Keyword(s):  
Reference Frame ◽  
Large Scale ◽  
Total Error ◽  
Systematic Errors ◽  
Field Of View ◽  
Small Field ◽  
Inertial Reference Frame ◽  
Error Budget ◽  
G 14 ◽  
High Cadence

AbstractWe use methods of differential astrometry to construct a small field inertial reference frame stable at the micro-arcsecond level. Using Gaia measurements of field angles we look at the influence of the number of reference stars and the stars magnitude as well as astrometric systematics on the total error budget with the help of Gaia-like simulations around the Ecliptic Pole in a differential astrometric scenario. We find that the systematic errors are modeled and reliably estimated to the μas level even in fields with a modest number of 37 stars with G <13 mag over a 0.24 sq. degrees field of view for short timescales of the order of a day for a perfect instrument and with high-cadence observations. Accounting for large-scale calibrations by including the geometric instrument model over such short timescales requires fainter stars down to G=14 mag without diminishing the accuracy of the reference frame.

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