Does "What You Don't See" Apply to Special Relativity?

In summary, the conversation discusses the role of abstract concepts in special relativity and how they can sometimes lead to incorrect conclusions. It also touches on the question of whether we can see the effects of relativity, specifically the Lorentz contraction, through observations or thought experiments. Some argue that we can see it in certain circumstances, while others argue that it is impossible to visually observe the contraction. However, this only applies to perfectly spherical objects, as other objects can be visually observed to undergo length contraction.
  • #1
bernhard.rothenstein
991
1
Does " What you don't see with your eyes, don't invent with your mouth" does work in special relativity?:rofl:
 
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  • #2
Your post is a bit vague - you must have something specific in mind!
 
  • #3
Abstract concepts are very useful in relativity, as elswhere. This is what I assume is meant by "don't see with your eyes" - abstractions.

But sometimes people incorrectly carry over abstract concepts that used to work in Newtonian theory to relativity. This can be a problem.

Discussing everything in terms of observations (i.e. no abstractions, take everything down to the lowest level of what is actually measured and directly observed) is more work, but is one way (and one of the better ways) of avoiding or sidestepping the trap of incorrrect abstract concepts, if all parties are sufficiently dedicated, patient, and have enough time.
 
  • #4
believe what you see?

yogi said:
Your post is a bit vague - you must have something specific in mind!
When I posted the thread I did not have a clear answer to the question proposing it only for relaxation. Pervect's answer is interesting. In between I remembered an old question in special relativity: Can we see the Lorentz contraction? As far as I know there are authors who consider that we are not able to see it (Terrel?) and others who consider that under certain circumstances we can. Are thought experiments a way to make abstract concepts more palpable?
 
  • #5
pervect said:
Abstract concepts are very useful in relativity, as elswhere. This is what I assume is meant by "don't see with your eyes" - abstractions.

But sometimes people incorrectly carry over abstract concepts that used to work in Newtonian theory to relativity. This can be a problem.

Discussing everything in terms of observations (i.e. no abstractions, take everything down to the lowest level of what is actually measured and directly observed) is more work, but is one way (and one of the better ways) of avoiding or sidestepping the trap of incorrrect abstract concepts, if all parties are sufficiently dedicated, patient, and have enough time.

Thanks. Do you mean by abstract "instantaneous velocity", "instantaneous frequency"...? Using photographic detection or radar detection we can compare (see) the snapshots or the radar screens of two observers in relative motion. Such approaches ensure the fact that we believe what we see?
 
  • #6


bernhard.rothenstein said:
When I posted the thread I did not have a clear answer to the question proposing it only for relaxation. Pervect's answer is interesting. In between I remembered an old question in special relativity: Can we see the Lorentz contraction? As far as I know there are authors who consider that we are not able to see it (Terrel?) and others who consider that under certain circumstances we can. Are thought experiments a way to make abstract concepts more palpable?

The not being able to see (or photograph) the Lorentz length contraction of a moving object only applies to the case of a perfect sphere. The length contraction of a long rectangle or rod for example can be photographed. The demonstration that the the length contraction of a sphere cannot be visually photographed is seized upon by too many to imply (incorrectly) that length contraction cannot be seen in ANY object and that length contraction is an illusion.

Oops, just noticed this is a very old thread. Sorry! Stumbled across it when searching for something else.
 
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1. What is "What You Don't See" and how does it relate to special relativity?

"What You Don't See" is a concept in special relativity that refers to the idea that the laws of physics should be the same for all observers, regardless of their relative motion. This means that even if an object is moving at high speeds, its physical properties should appear the same to an observer as they would if the object was stationary.

2. Can you give an example of how "What You Don't See" applies to special relativity?

One example is the famous thought experiment of the twin paradox. In this scenario, one twin stays on Earth while the other twin travels through space at high speeds. According to special relativity, time will pass slower for the traveling twin, so when they return to Earth, the traveling twin will be younger. This is because from the perspective of the traveling twin, time appeared to pass normally, while from the perspective of the stationary twin, time appeared to pass slower.

3. How does "What You Don't See" impact our understanding of the universe?

"What You Don't See" is a fundamental principle in special relativity that has greatly impacted our understanding of the universe. It has led to the development of theories such as time dilation, length contraction, and the equivalence of mass and energy. It has also helped explain phenomena such as the behavior of particles at high speeds and the bending of light around massive objects.

4. Is "What You Don't See" limited to special relativity or does it apply to other areas of physics?

While "What You Don't See" is most commonly associated with special relativity, it also applies to other areas of physics such as quantum mechanics. In quantum mechanics, the principle of superposition states that an object can exist in multiple states simultaneously until it is observed. This is similar to "What You Don't See" in that the behavior of an object is dependent on the observer.

5. Are there any limitations to "What You Don't See" in special relativity?

While "What You Don't See" is a fundamental principle in special relativity, it does have some limitations. It only applies to systems that are in a state of constant motion, and not to systems that are accelerating. It also does not account for the effects of gravity, which must be taken into consideration in certain scenarios, such as near massive objects.

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