At light speed, Einstein's equations break down and nothing makes sense

submitted by hfxB0oyA from bigthink.com

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[–]zyxzevn 1 insightful - 2 fun1 insightful - 1 fun2 insightful - 2 fun -  (7 children)

Indeed, in practice it is used as time-dilation in different ways.
But calling it time is a huge mistake.

Black holes do not exist btw.
Here is a full breakdown of all the evidence

[–]Vulptex 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (3 children)

I think you're confused because they try to explain it as time travel. Technically you're always time-travelling forward into the future. But when people hear time travel they think of cars from the 1980s jumping to a different time once they hit 88 mph. Instead Einstein's theories say that speed and heavy mass don't do this, rather they simply slow the existing mechanism of passing time. So if you zoom by a black hole, years could go by in seconds. But in reality you were just moving very slowly through that zone the whole time, so slowly that it took years for a few seconds to pass. You don't just jump into the future. And it certainly won't allow you to go backwards, so no paradoxes.

[–]zyxzevn 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (2 children)

It is also about global time. An event happens at one moment everywhere.
But if we follow Einstein's special relativity to the letter, it seems that something only happens when light has bridged the distance.
This is what all popular science is spewing out.
One would realistically state that some happening only is observed after the light has bridged the distance.

This gets more complicated with the gravity time-dilation.
Btw. I was looking for the evidence for the change in time by gravity,
by taking a clock to a different altitude to a mountain for example.
Do you know of any.

[–]Vulptex 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

It happens before light gets there, you just don't see it happen until it does.

Time dilation has been observed with earth's gravity. It's something like billionths of a second, but apparently enough that satellites have to take it into account.

[–]zyxzevn 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

There are some different models that also explain time-dilation.
And I am looking for some good experimental data.
Like that time changes due to moon's gravity too. And how does it change around earth, on a tower, mountain, under water, north-pole etc.
The Earth's gravity map may be useful. link

There are some important tests that failed. Like on space-time bending.
Like Gravity Probe B failed. https://www.newscientist.com/article/dn13938-gravity-probe-b-scores-f-in-nasa-review/
And they "corrected" it by changing the outcome of the tests towards Einstein's model.

Another problem is that accelerating electric charges experience a magnetic resistance. But they do not experience that in gravity. Which means that electromagnetism is not following the law of acceleration=gravity. I saw someone try to explain it with complex maths, but it is just bad maths.
And there is a lot of bad maths in how the tensors are applied in Einstein's gravity too.

There are many more of such problems, which may point towards a different model.
Like Einstein's variable speed-of-light gravity model

There may be many other models possible.
But first we need to update the observations with the latest most accurate data measurements.
And account for possible other influences. So we get observation based science.

[–]Vulptex 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (2 children)

Black holes are not the only objects with gravity, and therefore not the only objects producing time dilation. Even relatively light objects such as this planet create time dilation; unnoticeable, but enough that it can be observed, much like its curvature.

If there are black holes the effect is much more extreme. So extreme that if you fall into one you'd not only see the entire remainder of history unfold in minutes, but you'd also encounter everything else that's ever fallen into it and ever will fall into it. At that point you'd probably just get ejected from the universe, and a little too late for a reincarnation. If there is "spaghettification", the entire process only takes like 0.1 seconds, which isn't enough time for the sensation to reach your brain. But considering those things suck in things like stars, you'd likely be burned alive before then, so ouch.

[–]zyxzevn 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

There is no real evidence for Black holes
See -> https://thescienceanalyst.substack.com/p/deep-anal-ysis-of-black-holes

[–]Vulptex 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

I saw that. Maybe you're right. But that's irrelevant.