Are light and time somehow intertwined?

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Discussion Overview

The discussion revolves around the relationship between light and time, particularly in the context of their coexistence and interdependence within the framework of relativity. Participants explore theoretical implications and the nature of these concepts in physics.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant proposes that time and light may need each other to coexist, suggesting a fundamental relationship influenced by the curvature of spacetime.
  • Another participant asserts that light travels at a constant speed and questions the manipulation of time as described, emphasizing that time appears to slow for moving frames of reference.
  • Some participants argue that while light is dependent on relativity, relativity itself does not depend on light, indicating that the structure of relativity would remain unchanged without light.
  • There is a discussion about whether anything can substitute light for the c-constant, with some expressing skepticism about the existence of such substitutes.
  • Gravitational waves are mentioned as another phenomenon that travels at the speed of light, prompting acknowledgment from other participants.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between light and time, with no consensus reached on whether they are fundamentally intertwined or if one can exist independently of the other. The discussion includes both agreement on certain points and contention regarding the implications of relativity.

Contextual Notes

Some statements rely on specific interpretations of relativity and the nature of light, which may not be universally accepted. The discussion includes assumptions about the roles of light and time that are not fully resolved.

Jaami M.
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I'm wondering if time and light(entire spectrum) can only coexist simotanuously. When we look out into the cosmos and see stars they can be many light years away. Because it takes time for light to travel. That may have not been relevant. But what I'm saying is... Time is manipulated by the curvature of space time, and the faster you travel to the speed of light your time is manipulated. So does time and light have a relation? Are they completed coherent of each other, needing one another to co-exist?
 
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Well, light travels at 299792458 m/s exactly. It has to, because photons are massless (well, that's taking some liberty). The statement brings in space too. I have a hard time (:smile:) imagining one of the three missing. But it's an odd triangle with time and space intertwined and light kind of linking the two.

Time isn't manipulated the way you describe: you don't notice that. What you do notice it that time seems to go slower for things/frames of reference that move relative to you.
 
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You may find this helpful: https://www.physicsforums.com/threa...-than-the-speed-of-light.478783/#post-3174586

The c in special relativity should not be thought of as the speed of light.

Jaami M. said:
So does time and light have a relation? Are they completed coherent of each other, needing one another to co-exist?

No. Light depends on relativity, but relativity does not depend on light. Relativity would have exactly the same structure if light didn't exist.
 
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bcrowell said:
You may find this helpful: https://www.physicsforums.com/threa...-than-the-speed-of-light.478783/#post-3174586

The c in special relativity should not be thought of as the speed of light.
No. Light depends on relativity, but relativity does not depend on light. Relativity would have exactly the same structure if light didn't exist.
I agree. But, is there anything which qualifies to substitute light for the c-constant? I am hopefully thinking there is.
 
Legolaz said:
I agree. But, is there anything which qualifies to substitute light for the c-constant? I am hopefully thinking there is.

Not really. Nothing else freely travels vast distances at c other than light.
 
Drakkith said:
Not really. Nothing else freely travels vast distances at c other than light.

Gravitational waves.
 
bcrowell said:
Gravitational waves.
Ah yes, I forgot about those.
 

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