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 - 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.