# Time dilation interpretation

• B
• teacher94
In summary, the conversation discusses the concept of time dilation and how it relates to the movement of particles and causality. The speakers also explore the idea of distinguishing between a slow in time and a slow in physical processes, and question whether the math would still work the same with this interpretation. They also debate the justification for treating every physical process as slowing down at the same rate and examine the concept of time as "path length" in relativity. The conversation concludes with a discussion about the name given to the phenomenon of time.

#### teacher94

TL;DR Summary
Hi, i am not a physicist but i have the intuition that time dilation is just slow in the movement of particle's and causality instead of slow in time itself and that this does not affect photons. I understand that there is no way to distinguish between a slow in time and a slow in movement and causality but would the math still work the same if we assume this interpretation of time dilation? Thank you
Hi, i am not a physicist but i have the intuition that time dilation is just slow in the movement of particle's and causality instead of slow in time itself and that this does not affect photons. I understand that there is no way to distinguish between a slow in time and a slow in movement and causality but would the math still work the same if we assume this interpretation of time dilation? Thank you

PeroK
If you assume that every possible physical process is slowed, then there are a couple of questions:
1) How would you distinguish between that and time dilation?
2) How can you explain every possible physical process slowing down exactly the same amount? That is a lot to explain. On the other hand, you can just say that there is time dilation and everything else follows.

russ_watters, Dale and teacher94
FactChecker said:
If you assume that every possible physical behavior is slowed, then there are a couple of questions:
1) How would you distinguish between that and time dilation?
2) How can you explain every possible physical behavior slowing down exactly the same amount? That is a lot to explain. On the other hand, you can just say that there is time dilation and everything else follows.
Well said, i did say it is impossible to distinguish between a slow in every physical event and a slow in time. That is right i just am saying this is possible interpretation with which the math would still work the same.

Time is what your watch measures. Einstein told us it is not as simple as we imagined it to be. Your intuition is up to you but the arithmetic uses what your watch measures.

hutchphd said:
Time is what your watch measures. Einstein told us it is not as simple as we imagined it to be. Your intuition is up to you but the arithmetic uses what your watch measures.
Thank you for your help, so what you aresaying is that it is possible that it's not time that slowing but we have no way of distinguishing between a slow in time and a slow in physical processes?

teacher94 said:
i just am saying this is possible interpretation with which the math would still work the same.
Not really. Treating every physical process separately would require a different variable for the amount that every single physical process slowed down. Then you would have to assume that all those factors were equal. How would you justify that? It hurts my head. You would eventually have to admit that it is time itself that has dilated.

russ_watters, hutchphd and Dale
It depends upon what you mean by "a slow physical process" but the destinction you seem to be drawing is neither useful nor correct.
What would be an example of such a process?

hutchphd said:
It depends upon what you mean by "a slow physical process" but the destinction you seem to be drawing is neither useful nor correct.
What would be an example of such a process?
For example the speed of a chemical reaction or speed of a moving object slow down by the same rate.

FactChecker said:
Not really. Treating every physical process separately would require a different variable for the amount that every single physical process slowed down. Then you would have to assume that all those factors were equal. How would you justify that? It hurts my head. You would eventually have to admit that it is time itself that has dilated.
The justification for the slow of evey process by the same factor could be justified by saying that object that move fast have large kinetic energy which in itself is mass since mass and energy are the same this will result in every particle in that object being heavier so it moves slower.

teacher94 said:
Thank you for your help, so what you aresaying is that it is possible that it's not time that slowing but we have no way of distinguishing between a slow in time and a slow in physical processes?
I would say the point is that "time slowing" is a popsci description that doesn't really capture what's going on. Relativity models time in the sense you mean as "path length" through spacetime, and time never runs slow or fast. It's just that some paths are longer and others are shorter, and when paths aren't parallel the projection of one tick of your clock onto my history isn't the same "length" as one tick of my clock.

Time is just the name we give to the phenomenon.

Motore, ersmith and teacher94
(Proper) time is indeed the name we give it. So? Why "just"?

teacher94
thank you
Ibix said:
I would say the point is that "time slowing" is a popsci description that doesn't really capture what's going on. Relativity models time in the sense you mean as "path length" through spacetime, and time never runs slow or fast. It's just that some paths are longer and others are shorter, and when paths aren't parallel the projection of one tick of your clock onto my history isn't the same "length" as one tick of my clock.

Time is just the name we give to the phenomenon.
very much for the explanation.

hutchphd
hutchphd said:
(Proper) time is indeed the name we give it. So? Why "just"?
I say just to differentiate it from absolute time which is the same everywhere in the universe.

hutchphd said:
(Proper) time is indeed the name we give it. So? Why "just"?
Because arguing about whether it's "really" time doing XYZ is kind of pointless. Time is, as you said, what watches measure. If my watch/heartbeat/whatever process is running slow (putting aside the issues with that term for now) then time is running slow by definition of the word.

Motore, hutchphd, Dale and 1 other person
teacher94 said:
absolute time which is the same everywhere in the universe.
That definitely doesn't exist.

hutchphd, Dale and teacher94
Only if you can define your motion relative to that "absolute" frame. Your "time" will almost always be different. Its relative.

teacher94
teacher94 said:
and that this does not affect photons
It seems problematic to make ad hoc exceptions like this. Maxwell’s equations work in every inertial frame, as do the equations of quantum electrodynamics. Doppler shifts follow the relativistic equation, not the Newtonian one. So this exception seems unjustified to me.

Photons don’t have either their own frame or proper time. But time dilation not affecting them seems to be a bit of a stretch.

teacher94 said:
but would the math still work the same if we assume this interpretation of time dilation?
I think you would need to actually derive this to show it. Frankly, I don’t see how your photon exception could even be expressed mathematically. So I would guess “no”.

The thing to do would be to find a peer reviewed paper describing such an approach. I don’t know of one.

teacher94 and Ibix
Well it is impossible for us to observe it because we live in a relative time nad relative movement but thatdoes not mean it does not exist.

Motore and PeroK
@teacher94 do you have a peer reviewed reference that describes this approach of yours?

teacher94
Dale said:
@teacher94 do you have a peer reviewed reference that describes this approach of yours?
No, your answers convinced me of why my intuition is wrong, thank you all for your time.

hutchphd and Dale
teacher94 said:
Well it is impossible for us to observe it because we live in a relative time nad relative movement but thatdoes not mean it does not exist.
Then you presumably believe in invisible unicorns because you can't prove they don't exist. Up to you I guess, but it doesn't seem very parsimonious to propose things that you don't need in a model to explain anything, can't detect, and don't do anything except make you add words to your descriptions of things you do need in the model in order to distinguish them from your unnecessary additions.

Motore, hutchphd and teacher94
Ibix said:
Then you presumably believe in invisible unicorns because you can't prove they don't exist. Up to you I guess, but it doesn't seem very parsimonious to propose things that you don't need in a model to explain anything, can't detect, and don't do anything except make you add words to your descriptions of things you do need in the model in order to distinguish them from your unnecessary additions.
You are right, science is concerned only with what is observable and measurable. Thank you for your help.

teacher94 said:
The justification for the slow of evey process by the same factor could be justified by saying that object that move fast have large kinetic energy which in itself is mass since mass and energy are the same this will result in every particle in that object being heavier so it moves slower.
Explanations of this sort fail to explain the symmetry of time time dilation: if A and B are moving relative to one another, A finds that B’s clock is running slow and B finds that A’s clock is running slow.

teacher94
teacher94 said:
Hi, i am not a physicist but i have the intuition
Would you go to a medical practitioner who never went to med school and said. "Woo hoo! I can fix your cough! Just cut you right open and yank the bad parts out. 'Cause I got intuition, ya see!!"

"Intuition" is not all that reliable. Uninformed intuition even less so.

You seem to be holding the position that there is One True Time, forever unmeasureable, and every physical process just appears to experience time dilation, With all due respect, that's a personal theory, and a lousy one. Why is it lousy? Because it doesn't allow us to predict anything beyond or better than what SR predicts. It just helps one non-expert feel better.

One last thing - a tree is 10 feet to my left, I turn 45 degrees and now it is 7 feet ahead iof me and 7 feet to my left. Is this a problem? If not, why is doing the same thing for time?

Nugatory said:
Explanations of this sort fail to explain the symmetry of time time dilation: if A and B are moving relative to one another, A finds that B’s clock is running slow and B finds that A’s clock is running slow.
right the symmetry of time dilation is a different story.

teacher94 said:
right the symmetry of time dilation is a different story.
Well, that's kind of the point. With a "time is path length through spacetime" interpretation, none of this is a different story. It's all part of one unified (and fairly simple) framework that fits neatly into the broader framework of general relativity, which is what makes it useful.

teacher94
Ibix said:
Well, that's kind of the point. With a "time is path length through spacetime" interpretation, none of this is a different story. It's all part of one unified (and fairly simple) framework that fits neatly into the broader framework of general relativity, which is what makes it useful.
Tobe honedt relativity is a simple accurate model with great predictive and explanatory power. I know it's the best we have. But i just donot believe time can be affected or chnged.

teacher94 said:
But i just donot believe time can be affected or chnged.
As I said, I don't think it's meaningful to talk about time changing, or running slow, or whatever. There are just different paths through spacetime.

I get why people use such terms in layman-friendly presentations, but they aren't accurate.I would advise learning about special relativity as a geometric theory if you are interested.

gmax137, Motore, vanhees71 and 1 other person
teacher94 said:
The justification for the slow of evey process by the same factor could be justified by saying that object that move fast have large kinetic energy which in itself is mass since mass and energy are the same this will result in every particle in that object being heavier so it moves slower.
The whole system consisting of bouncing quartz clocks has extra rest-mass. And also the whole system consisting of the quartz crystals has extra rest-mass, according to the relativistic addition of masses.

And according to the law that says that harmonic oscillator's ticking rate is inversely proportional to the square root of its mass, there is a slowing down effect, but it's too small. So it's not the whole explanation.

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Motore and hutchphd
jartsa said:
rest-mass
You may mean "transverse relativistic mass". But since that does not match "longitudinal relativistic mass", the concept is of little use.

An object moving at a high rate of speed has the same rest mass as when it is at rest. By definition.

Most "clocks" use electric forces to tick tock. Therefore they will absolutely agree with the "light clock" of special relativity fame.

jbriggs444 said:
You may mean "transverse relativistic mass". But since that does not match "longitudinal relativistic mass", the concept is of little use.

An object moving at a high rate of speed has the same rest mass as when it is at rest. By definition.
No I meant the rest-mass of the whole system. I'll go and remove the confusing first sentence.

If we heat up the mass of an harmonic oscillator the oscillation slows down, because of the rest-mass increase.

jbriggs444
teacher94 said:
But i just do not believe time can be affected or changed.
And relativity agrees with this (most clearly in the geometric formulation, and if you are not already familiar with these concepts to at least the level of the early chapters of Taylor and Wheeler's "Spacetime Physics" you are frankly wasting your time and time of the people engaging with you) .

The catch is that time, that thing which cannot be "affected or changed" isn't quite what you're thinking it is. Start with a clear and experimental realizable statement of what is meant by the popular and fuzzy "time slows down for moving objects", do this twice for the the two fundamentally different situations in which this is said (time dilation when A and B are moving relative to one another, twin paradox when A and B separate and reunite), and you will develop a more clearly defined concept of what tIme is.

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Nugatory said:
And relativity agrees with this (most clearly in the geometric formulation, and if you are not already familiar with these concepts to at least the level of the early chapters of Taylor and Wheeler's "Spacetime Physics" you are frankly wasting your time and time of the people engaging with you) .

The catch is that time, that thing which cannot be "affected or changed" isn't quite what you're thinking it is. Start with a clear and experimental realizable statement of what is meant by the popular and fuzzy "time slows down for moving objects", do this twice for the the two fundamentally different situations in which this is said (time dilation when A and B are moving relative to one another, twin paradox when A and B separate and reunite), and you will develop a more clearly defined concept of what tIme is.
No matter how you look at time boils down to how many events happen in the span of another event, for example how many times the pendulum swings in the span of a free falling motion of a ball. So time is in a sense measure of how many events that we use as measuring ruler(for example the swings of a pendulum) can fit in the span of another event say the free fall of a ball.

jbriggs444
teacher94 said:
No matter how you look at time boils down to how many events happen in the span of another event, ...
Which is to say that it is a comparison of clocks.
Which is to say that time is what clocks measure.

Dale and teacher94