Timeline for Is my understanding of the concept on time dilation accurate?
Current License: CC BY-SA 4.0
17 events
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| Jan 1, 2022 at 3:55 | answer | added | stuffu | timeline score: -1 | |
| Jan 1, 2022 at 2:53 | comment | added | supertonsky | @StéphaneRollandin, thanks for sparing your time. This thing just simply is too hard to grasp especially if I read the answers to be contradictory to what I have read. I read his answers as time dilation is just an illusion and just a matter of perspective. | |
| Jan 1, 2022 at 2:51 | history | edited | supertonsky | CC BY-SA 4.0 |
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| Dec 31, 2021 at 10:11 | comment | added | Stéphane Rollandin | Have a look (well I guess you did) at Marco's answer - I cannot go longer in the comment section here. My main point to summarize is that indeed no physical explanation is needed for so-called "time dilation", because it is not the end result of any mechanism, but an aspect of the struture of spacetime itself, which is very, very far away from our daily intuition (where we separate space and time completely). Sorry to not go deeper here, this is not the place to do so. | |
| Dec 31, 2021 at 3:47 | comment | added | supertonsky | @StéphaneRollandin, thanks. If it's not an analogy but a real effect, doesn't that actually reinforce my understanding? I felt your response simply invalidates my understanding but offers no explanation why time is shorter. Isn't time just simply measure of change such as tick in a light clock? | |
| Dec 30, 2021 at 11:09 | comment | added | Stéphane Rollandin | "why are there analogies like someone travelled at the speed of light and returned back younger" This is not an analogy - it's a very real effect. As I said observers do measure different durations for the same process (here, the trip). The traveller has really experienced a shorter delay before its starting and coming back moments than the non-travelling observer. But for both of them, nothing ever slowed down. As for "why?", you should not look for any hidden or subtle process or mechanism, but accept the invalidity of some common sense notions about what time is - not an easy task indeed. | |
| Dec 30, 2021 at 2:33 | comment | added | supertonsky | @StéphaneRollandin, what I meant by "time has to slow down" was the vertical velocity of the light in time measuring device has to decrease in order to gain some horizontal velocity when the space ship moves horizontally rendering the time measure device to "tick" slower from the perspective of outside observer. | |
| Dec 30, 2021 at 2:02 | comment | added | supertonsky | @garyp, if it does not affect anything, why are there analogies like someone travelled at the speed of light and returned back younger? What explains that someone who travelled close to the speed of light to be biologically younger? Are those analogies incorrect and misleading? What about the clock that has orbited Earth and returned back with time lagging behind? That seems to me it affected the passage of time. | |
| Dec 30, 2021 at 1:57 | comment | added | supertonsky | @StéphaneRollandin, thanks for clarification. I got the idea that time slows down from the famous space ship illustration where it carries a time device where light bounces vertically and when moving horizontally, in order not to breach the speed of light, time has to slow down. | |
| Dec 29, 2021 at 22:50 | answer | added | Professor Sushing | timeline score: 3 | |
| Dec 29, 2021 at 20:48 | comment | added | Stéphane Rollandin | Nothing is affected by moving close to the speed of light, because motion is relative and so deciding if you are moving or not moving is a matter of convention. So nothing at all is changing in your body depending on your speed, and notably nothing slows down and nothing freezes. Time dilation is about how different observers measure different durations for the same process, it is not about your time changing because you are moving. On the contrary, by just observing your body you can not tell if you are moving or not (and this is Galilean relativity). | |
| Dec 29, 2021 at 18:15 | comment | added | garyp | Yes, but the word "affected" is troublesome. It implies that whatever is affecting one aspect is affecting all. That's not the spirit of the principle. The spirit is that there is no affectation. Nothing is affected. | |
| Dec 29, 2021 at 18:12 | answer | added | stuffu | timeline score: 0 | |
| Dec 29, 2021 at 16:59 | comment | added | supertonsky | @garyp, thanks. On 2), I actually mentioned in the 6th paragraph that your body would never know because your biological processes or any time measuring devices with you would also be affected. | |
| Dec 29, 2021 at 16:36 | comment | added | garyp | Two comments. 1) special relativity produces "singularities" (e.g. division by zero) when the value of $c$ is substituted for $v$. That is, the equations of special relativity do not apply to objects moving at the speed of light. (Aside: Since there are uncountable experiments consistent with relativity, we conclude for the moment that nothing in nature can achieve that speed.) 2.) More importantly for your argument: you are missing one of the principles of relativity, that physics is the same in every inertial frame of reference. If you move at 0.999$c$, your body would never know. | |
| Dec 29, 2021 at 16:14 | history | edited | supertonsky | CC BY-SA 4.0 |
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| Dec 29, 2021 at 16:06 | history | asked | supertonsky | CC BY-SA 4.0 |