scholarly journals Light Propagation on a Moving Closed Contour and the Role of Simultaneity in Special Relativity

2021 ◽  
Vol 3 (4) ◽  
pp. 48-53
Author(s):  
Gianfranco Spavieri
Keyword(s):  
Special Relativity ◽  
Light Propagation ◽  
Closed Contour ◽  
Speed Of Light ◽  
Consistent Description ◽  
Local Speed

We consider an example of a moving closed contour and the role played by simultaneity in the description of light propagation on the contour's moving sections. We show that, when constrained to propagate along the contour, the local speed of light on a moving section is no longer arbitrary and a consistent description requires conservation of simultaneity.

KINEMATICAL TEST THEORIES FOR SPECIAL RELATIVITY: A COMPARISON

2002 ◽  
Vol 11 (07) ◽  
pp. 1109-1136 ◽  
Author(s):  
CLAUS LÄMMERZAHL ◽  
CLAUS BRAXMAIER ◽  
HANSJÖRG DITTUS ◽  
HOLGER MÜLLER ◽  
ACHIM PETERS ◽  
...  
Keyword(s):  
Special Relativity ◽  
Light Propagation ◽  
Experimental Results ◽  
Speed Of Light ◽  
Theoretical Results

A comparison of certain kinematical test theories for Special Relativity including the Robertson and Mansouri–Sext test theories is presented and the accuracy of the experimental results testing Special Relativity are expressed in terms of the parameters appearing in these test theories. The theoretical results are applied to the most precise experimental results obtained recently for the isotropy of light propagation and the constancy of the speed of light.

Light propagation in cholesteric liquid crystals: the role of chirality

2020 ◽  
Vol 713 (1) ◽  
pp. 65-77
Author(s):  
Tianyi Guo ◽  
Xiaoyu Zheng ◽  
Peter Palffy-Muhoray
Keyword(s):  
Liquid Crystals ◽  
Light Propagation ◽  
Cholesteric Liquid Crystals

scholarly journals Special Relativity sans Lorentz Transformation (OR) Perceptional Relativity

2021 ◽  
Author(s):  
Sebastin Patrick Asokan
Keyword(s):  
Special Relativity ◽  
Lorentz Transformation ◽  
Special Theory ◽  
Theory Of Relativity ◽  
Special Theory Of Relativity ◽  
Speed Of Light ◽  
Inertial Frames ◽  
Impossible Task

Abstract This paper shows that from the fact that the same Reality is perceived differently by the observers in different inertial frames, we can draw a simple and straightforward explanation for the constancy of light's speed in all inertial frames without any need for bringing in paradoxical Lorentz Transformation. This paper also proves that Lorentz Transformation has failed in its attempt to do the impossible task of establishing t' ≠ t to explain the constancy of the speed of light in all inertial frames without contradicting the interchangeability of frames demanded by the First Postulate of the Special Theory of Relativity. This paper also points out the misconceptions regarding the claimed experimental verifications of Lorentz Transformation's predictions in the Hafele–Keating experiment and μ meson experiment. This paper concludes that Einstein's Special Theory Relativity can stand on its own merits without Lorentz Transformation.

scholarly journals SUBLUMINAL OPERA NEUTRINOS

2012 ◽  
Vol 27 (07) ◽  
pp. 1250033 ◽  
Author(s):  
ICHIRO ODA
Keyword(s):  
Special Relativity ◽  
Recent Work ◽  
Causal Structure ◽  
Pion Decay ◽  
Speed Of Light ◽  
The Earth

The OPERA Collaboration has announced to have observed superluminal neutrinos with a mean energy 17.5 GeV, but afterward the superluminal interpretation of the OPERA results has been refuted theoretically by Cherenkov-like radiation and pion decay. In a recent work, we have proposed a kinematical resolution to this problem. A key idea in our resolution is that the OPERA neutrinos are not superluminal but subluminal since they travel faster than the observed speed of light in vacuum on the earth while they do slower than the true speed of light in vacuum determining the causal structure of events. In this paper, we dwell upon our ideas and present some concrete models, which realize our ideas, based on spin 0, 1 and 2 bosonic fields. We also discuss that the principle of invariant speed of light in special relativity can be replaced with the principle of a universal limiting speed.

Cherenkov Light

2016 ◽  
pp. 317-335
Keyword(s):  
Special Relativity ◽  
Glass Sample ◽  
Cherenkov Light ◽  
Speed Of Light ◽  
Important Condition

Consider an electron approaching a sample of glass with a velocity close to the speed of light, c. As the electron moves through the glass light will instantly be emitted along its track, if its velocity is high enough. Even more, the electron will leave the glass sample before the light since the velocity of the particle inside the sample is larger than the speed of the light. At first sight, this seems to be in contradiction to Einstein's theory of special relativity, which states that nothing can travel faster than the speed of light, but one often forgets the important condition: in vacuum. This is the story of light emitted at particle travelling faster than the speed of light.

Why the Sagnac effect favors absolute over relative simultaneity

2019 ◽  
Vol 32 (3) ◽  
pp. 331-337 ◽  
Author(s):  
Gianfranco Spavieri ◽  
Espen Gaarder Haug
Keyword(s):  
Special Relativity ◽  
Thought Experiment ◽  
Relativistic Effects ◽  
Light Signal ◽  
Sagnac Effect ◽  
Closed Path ◽  
Speed Of Light ◽  
Round Trip ◽  
The One ◽  
Absolute Synchronization

We consider a thought experiment, equivalent to the Sagnac effect, where a light signal performs a round trip over a closed path. If special relativity (SR) adopts Einstein synchronization, the result of the experiment shows that the local light speed cannot be c in every section of the closed path. No inconsistencies are found when adopting absolute synchronization. Since Einstein and absolute synchronizations can be discriminated, the conventionality of the one-way speed of light holds no longer. Thus, as sustained by specialists, it might be a viable formulation of SR that reinstates the conservation of simultaneity, even though it allows for relativistic effects, such as time dilation. Such an approach may lead to the discovery of new effects and a better understanding of relativistic theories.

A genesis of special relativity

2015 ◽  
Vol 24 (10) ◽  
pp. 1530024
Author(s):  
Valérie Messager ◽  
Christophe Letellier
Keyword(s):  
Special Relativity ◽  
19Th Century ◽  
Maxwell Equations ◽  
Light Propagation ◽  
Principle Of Relativity ◽  
Light Rays ◽  
Optical Phenomena ◽  
Light Particles ◽  
The 19Th Century ◽  
The Waves

The genesis of special relativity is intimately related to the development of the theory of light propagation. When optical phenomena were described, there are typically two kinds of theories: (i) One based on light rays and light particles and (ii) one considering the light as waves. When diffraction and refraction were experimentally discovered, light propagation became more often described in terms of waves. Nevertheless, when attempts were made to explain how light was propagated, it was nearly always in terms of a corpuscular theory combined with an ether, a subtle medium supporting the waves. Consequently, most of the theories from Newton's to those developed in the 19th century were dual and required the existence of an ether. We therefore used the ether as our Ariadne thread for explaining how the principle of relativity became generalized to the so-called Maxwell equations around the 1900's. Our aim is more to describe how the successive ideas were developed and interconnected than framing the context in which these ideas arose.

scholarly journals On New Unified Bounds for a Family of Functions via Fractional q-Calculus Theory

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Li Xu ◽  
Yu-Ming Chu ◽  
Saima Rashid ◽  
A. A. El-Deeb ◽  
Kottakkaran Sooppy Nisar
Keyword(s):  
Quantum Theory ◽  
Special Relativity ◽  
Present Article ◽  
Time Scale ◽  
Relativity Theory ◽  
Positive Functions ◽  
Special Relativity Theory

The present article deals with the new estimates in q-calculus and fractional q-calculus on a time scale Tt0=0∪t:t=t0qn,n is a nonnegative integer, where t0∈ℝ and 0<q<1. The role of fractional time scale q-calculus can be found as one of the prominent techniques to generate some variants for a class of positive functions n n∈ℕ.Finally, our work will provide foundation and motivation for further investigation on time-fractional q-calculus systems that have an intriguing application in quantum theory and special relativity theory.

RELATIVITY AND THE SPEED OF LIGHT – A 100 YEAR OLD MISUNDERSTANDING

2006 ◽  
Vol 15 (02) ◽  
pp. 275-283 ◽  
Author(s):  
W. J. ŚWIATECKI
Keyword(s):  
Quantum Mechanics ◽  
Special Relativity ◽  
Thought Experiment ◽  
Minkowski Spacetime ◽  
Speed Of Light ◽  
The Past ◽  
Mistaken Belief

I point out a conceptual misunderstanding in the exposition of relativity, namely the mistaken belief that light has something to do with the essence of relativity. This misunderstanding can be clarified by stressing that the content of Special Relativity is simply that "we live in a Minkowski spacetime", together with a thought experiment that illustrates how one could discover this fact without ever mentioning even the existence of light. I also note a recently uncovered implication of living in Minkowski spacetime, namely the Copenhagen reinterpretation of Quantum Mechanics, developed in the past decade.

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