Relativity and the Perception of Time

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Summary:

Relativity on the human Body and the perception of time

Main Question or Discussion Point

Hello,

Dear Readers, as mentioned in the caption and Summary, i'am dearly interested in the perception of time due to relativity.
I thought About this for quite some time.What happens to the perception of time to the conciousness, I mean our weight is not the same, and our energy consumption is therefore not the same as well. Would'nt that mean that we're constantly living apart from each other in time?

I would like to philosophy about this topic for quite some while, so appreciate every responder!
 

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What I want to say, is that:would'nt it be due to the Energy potential, every Person having a own timeline in which they live in, because of relativity, aren't we Living therefore relatively together but not actually simultaneously in the same timeline?
 
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PeterDonis
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i'am dearly interested in the perception of time due to relativity.
There is no change in the perception of your own time due to relativity. The only thing relativity predicts is that, if two people separate, follow different paths through spacetime for a while, and then meet up again, the total elapsed time between meetings for each of them can be different. But neither of them will perceive any change in their own experience of time.
 
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PeterDonis
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I would like to philosophy about this topic
Please bear in mind that this is not a philosophy forum, it's a physics forum.
 
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PeterDonis
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would'nt it be due to the Energy potential, every Person having a own timeline in which they live in, because of relativity, aren't we Living therefore relatively together but not actually simultaneously in the same timeline?
None of this makes any sense.
 
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Okay, so the elapsed time with more Energy becomes Shorter ain't that Right?@peter donis
But our body has energy aswell, and should'nt our perception of time be linked to the energy of our body?@Peterdonis
 
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if a passenger is in the iss for 5 earth years for example, wouldnt the time he lived on the iss be not Shorter than 5 earth years?
 
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i mean there was a good example with Twins like you said, wasnt the Orbit Twin younger relatively ? Wouldnt that mean he lived less in Hours than his earth Twin?
 
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PeterDonis
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if a passenger is in the iss for 5 earth years for example, wouldnt the time he lived on the iss be not Shorter than 5 earth years?
The time he would experience would be a little shorter than the time experienced by a person on the surface of the Earth who was with him right before he launched and met up with him again after he landed. But neither of them would experience any difference in their own perception of the passage of time. Each of them would perceive their own time to be passing at one second per second. They would simply find that a different total number of seconds had elapsed on their clocks when they met up again.

This is not a matter of a difference in "perception of time". It's simply that they followed two different paths through spacetime, and those paths had different lengths. It's no different than two people driving from New York to Los Angeles by different routes, and finding that the total mileage shown on their odometers is different. It's a matter of geometry.
 
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Yeah, alright thats exactly what I meant.
 
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So if Peoplefrom iss and People from earth have a live conversation, the People from earth Sound a Little bit like slow Motion ?Just out of curiosity asking that.
 
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phinds
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So if Peoplefrom iss and People from earth have a live conversation, the People from earth Sound a Little bit like slow Motion ?Just out of curiosity asking that.
The effects of relativity in that case are was too small to be noticeable, so no.
 
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yeah thought so, but what if the Energy Parameters would differ severely, how would you make a live conversation ?
 
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PeterDonis
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So if Peoplefrom iss and People from earth have a live conversation, the People from earth Sound a Little bit like slow Motion ?
what if the Energy Parameters would differ severely
Instead of "energy parameters", let's use the term "relative speed", since it's the right one. And instead of the ISS orbiting the Earth, which brings in a lot of complications (gravity is present, the direction of the ISS in orbit is constantly changing, etc.), let's talk about two spaceships passing each other at relativistic relative speed and communicating by video chat.

Then the answer is that, if no corrections are made for time dilation or Doppler effect, each spaceship's crew will see the other spaceship's crew over video chat to be:

(1) Moving and talking faster than them while the two ships are approaching each other before they pass;

(2) Rapidly shifting from moving and talking faster to moving and talking slower as the ships pass each other;

(3) Moving and talking slower than them while the two ships are receding from each other after they pass.

This is because what each spaceship's crew actually sees, if no corrections are made, is governed, not by time dilation, but by the relativistic Doppler effect.

However, it is possible, if both ships know each other's trajectories beforehand, for software in the video chat link on each spaceship to correct for the light travel time of the video signals before presenting to the crew the images and sound from the other ship. If just this correction is done, then each ship's crew will see the other crew to be moving and talking slower all through the scenario.

In other words, time dilation is what remains of the relativistic Doppler effect after correction for the light travel time of the signals has been applied.

Also note that all the effects I described are symmetric between the two ships; each ship's crew sees no change in its own behavior, and sees the same change in the other crew's behavior.

To explain why an astronaut aboard the ISS, then, experiences slightly less time per orbit than an observer on Earth, you have to look at the relative motion of the ISS and the Earth observer during the entire orbit and how it changes, and add up all the relativistic Doppler effects to see which observer's clock comes out ahead. You can do this from the point of view of either observer, and the answer will be the same. In other words, this situation is not symmetric, but that's because this situation is not a simple "time dilation" situation like the one where the two ships just pass each other once and never meet again.
 
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should'nt our perception of time be linked to the energy of our body?
No. A fat person has more energy than a skinny one but their perception of time is the same.
 

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