Concept of the stability of the speed of light

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Discussion Overview

The discussion revolves around the concept of the stability of the speed of light, particularly focusing on the challenges of measuring it objectively. Participants explore the relationship between atomic clocks, nuclear decay, and the speed of light, questioning whether it is possible to measure the speed of light independently of these factors.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants suggest that current atomic clocks, which are based on the speed of electrons and nuclear decay, may not be able to accurately measure any potential variation in the speed of light.
  • There is a proposal to explore alternative methods for measuring the speed of light that do not rely on nuclear decay rates.
  • One participant provides a link to a list of methods for measuring the speed of light, indicating a desire for updated techniques.
  • Another participant expresses concern about the age of the provided resources, suggesting that the scientific community may not be investing in this question due to its complexity.
  • There is a discussion about the dependence of measuring techniques on various constants, with a suggestion that the speed of light itself may not be influenced by these constants in the same way.

Areas of Agreement / Disagreement

Participants express differing views on the ability to measure the speed of light objectively, with some questioning the current methodologies and others suggesting alternative approaches. The discussion remains unresolved regarding the feasibility of these measurements.

Contextual Notes

Participants note limitations in current measurement techniques and the potential influence of various constants on these methods. There is an acknowledgment of the complexity of the topic and the lack of recent advancements in measurement approaches.

Graham P
Help with the question of the concept of the stability of the speed of light. I gather that current atomic clocks are based upon the speed of the electron around their nucleus, which is a function of the speed of light. Measurements of the speed of light that depend upon atomic clocks therefore are unable to discriminate whether the objective speed of light is varying. IE, all they can do is ascertain what it is at the moment with respect to the rate of nuclear decay...which like the electron speed is also a function of the speed of light. Is it possible to objectively measure the speed of light, seeing as it is so intricately interwoven with our reference point?
 
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Graham P said:
Help with the question of the concept of the stability of the speed of light. I gather that current atomic clocks are based upon the speed of the electron around their nucleus, which is a function of the speed of light. Measurements of the speed of light that depend upon atomic clocks therefore are unable to discriminate whether the objective speed of light is varying. IE, all they can do is ascertain what it is at the moment with respect to the rate of nuclear decay...which like the electron speed is also a function of the speed of light. Is it possible to objectively measure the speed of light, seeing as it is so intricately interwoven with our reference point?
Are you asking if it's possible to measure and calculate the speed of light and see if it's still the same as last time?
 
nitsuj said:
Are you asking if it's possible to measure and calculate the speed of light and see if it's still the same as last time?
Yeah. But using some other means that doesn't depend on the rate of nuclear decay.
 
the link kindly supplied by bandersnatch relates to a file that is from 2005. Which is a long time ago, considering technical progress! It seems to indicate that no money is being spent on this question due to the fact that the community considers it too difficult. It links variously to http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/constants.html. It says that c depends on various constants, which is undoubtedly true, but it looks like it is not c that depends so much on those constants, but the measuring technique that depends on them... for example photons in a vacuum probably aren't too bothered by the mass and electro-magnetic force ratios of two electrons..which takes us back to the start.
 
Thread closed temporarily for Moderation...
 
@Graham P -- The PF is a mainstream scientific website. We do not allow challenges to mainstream science here. the Mentors will re-open this thread for a couple of replies to try to help you with links and resources to answer your literal questions. Then it will be re-closed. Please try to study mainstream science more in your learning. That is the best way to learn about reality.

Thread is re-opened for a bit...
 

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