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/sci/ - Science & Math

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4745874 No.4745874 [Reply] [Original]

Hello sci, This has bothered my for a while but most of the images that try to illustrate gravity do so with a two dimensional , interpretation of space time while in reality , gravity in space would be a spherical surround around the object with mass? am I right?

>> No.4745879

Yes. 2d is easier to visualize, but the image you have there is slightly more accurate. The lines are actually not nearly so strongly curved, except around very dense objects.

Also if it's spinning the lines won't curve in straight like that.

>> No.4745882

Yes, but that's only if it's a non-rotating one.

Things get rather funky when it's a rotating black hole.

>> No.4745900

Also with the illustration that show the sun as they planes rotate, trough the indentation made by the suns mass, is that how it really happens? same with black holes and with 3d space , would that render folding space like paper impossible (for worm holes)

>> No.4745918

>>4745879
>Also if it's spinning the lines won't curve in straight like that.
That's a good point.

I've always wondered about modelling relativistic spacetime as "aether flow and density". It just seems simpler.

>> No.4745924

with 3d space are worm holes even possible?

>> No.4745928

>>4745924
Wormholes are only illustrated as they are so you can visualise them.

>> No.4745940

>>4745879
Does the effect of gravity increase around the equator of a rotating object?

How does rotation affect gravity?

>curious

>> No.4745945

>>4745940
google frame dragging

>> No.4745951
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4745951

>>4745940
>How does rotation affect gravity?

Oh ho ho ho well, m'boy, where do we start...

>> No.4745953

>>4745945
thanks

>> No.4745954

alright and just one more question, with our universe as a whole would it be spherical ? because of all the gravity in the universe that is warping space time?

>> No.4745956

>>4745954
We're not entirely sure if it's spherical, flat, or elliptical. There are arguments for all sides.

>> No.4745959

No. Notice with the 2-d images they are bent in a third dimension. So with the 3-d ones they should be bent not how it is shown in your picture, but in a way that cannot be seen in 3-d.

>> No.4745965

>>4745940
>Does the effect of gravity increase around the equator of a rotating object?
Yes.

>How does rotation affect gravity?
"Frame dragging". If you orbit with the rotation, gravity's pull is lessened, if you orbit against it, gravity's pull is increased.

It is analogous to magnetism, and in fact is often called "gravitational magnetism".

Think of it as the gravitational field moving with the object that generates it: the more gravitational field you sweep through, the more you are affected by it. If you move with it, you sweep through less, if you move against it, you sweep through more.

>> No.4745972

>>4745954
>>4745956
It seems that spacetime is flat.
If it were spherical, it would end in Great Crunch.
If it were elliptical, it would end in a roughly steady state.
But because it is flat, it will end in heat death before timelike infinity.

>> No.4745973

>>4745956
> Not suggesting blob-shaped

c'mon son.jpg

>> No.4745977

Thank you all, I feel that this has really helped my understanding, conversations like these always get me exited XD

>> No.4745985

>>4745965
Sometimes I think the "dark matter" that causes galaxies to rotate at a nearly flat angular rate is more frame dragging than anything else.

>> No.4745991

>>4745973
>implying the universe isn't a hyper cube

>> No.4746006

>>4745991
Explain your reasoning why would be a hyper cube?

>> No.4746013

>>4746006
It's like a graduated cube. I think that's a pretty solid QED right there

>> No.4746017

>>4745965
That was a very comprehensive way of explaining it to me. Thank you.

>> No.4746130

Would anti-gravity expand space around it, instead of contracting it?