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/sci/ - Science & Math

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6097027 No.6097027 [Reply] [Original]

If gravity travels at the speed of light and light can't escape black holes, how does gravity exit it?

Theoretical physicists and spess men, explain yourselves

>> No.6097046

Cumputers are intelligent
They are bat at science
QED

>> No.6097049
File: 147 KB, 726x590, 1374031431588.jpg [View same] [iqdb] [saucenao] [google]
6097049

>>6097046

>> No.6097052

That's...not such a bad question, really.

>> No.6097056

>>6097027
Gravity doesn't travel in the terms you are thinking of

>> No.6097059

>>6097027
hawkings radiation

>> No.6097062 [DELETED] 

How does gravity work?

>> No.6097082

>>6097027
Gravity doesn't exit it, that's not how gravity works

>> No.6097088

conclusion ....

there is no space time continuum

everything is made of light

>> No.6097103

does the idea that the universe is expanding take into account that not all gravity has reached everywhere it will reach yet?

>> No.6097137

We don't have a quantum theory of gravity. Your guess is as good as mine.

>> No.6097358

>>6097027

>how does gravity exit it?

Gravity isn't a field. It's a consequence of the spacetime curvature caused by matter.

>> No.6097359

>>6097103

>not all gravity has reached everywhere it will reach yet?

This doesn't make sense. Gravity doesn't work by transmitting gravitational radiation between objects.

>> No.6097379

>>6097082
This.
Gravity works like a ripple on water.

>> No.6097422

>>6097027
So you're saying that the black hole is attracting the gravity into it because it travels at the same speed as light?

>> No.6097425

>>6097027
Primer fields

>> No.6097457

Light just changes position within space at a certain rate expressed as time, it's still traveling at that rate within space effected by gravity, it's just that the warping of space and time outpaces the speed of the light so that moving forward in time brings it closer to the singualirty. Gravity doesn't move within space, it's just an effect on a portion of space that varies in intensity based on distance in space.

>> No.6097462

>>6097425
>Primer fields
http://www.youtube.com/watch?v=6m_3RoRNPkg

Seems legit.

>> No.6097473

>>6097358
This.
I was about to type just about the same thing

>> No.6097476

>>6097103
the expansion of the universe is believed to be do to the presence of "dark energy" that causes space its self to expand

>> No.6097493

>>6097082
>>6097358
>>6097379
Except that gravity is transmitted by gravitons, which travel at light speed. Even without a quantum theory of gravity Einstein's equations show that gravitational changes propagate at the speed of light.

But if the speed of light isn't fast enough to get out of the black hole, how does the mass inside the black hole actually warp the space-time outside of it?

>> No.6097499

>>6097493
i thought that gravitons are a hypothetical particle,

>> No.6097501

>>6097499
Even without them Einstein's equations tell you that space time distortions travel at the speed of light.

>> No.6097505

>>6097501
Answering myself here, but I think the answer is that the entropy (and mass) are encoded by the surface area of the black hole. So the mass is effectively all bound at the event horizon, and so space-time is distorted from the event horizon out into regular space in the otherwise expected fashion.

The fun thing then is: if you were inside the black hole, you would think the mass is concentrated in the center. But from the outside it's all distributed over the surface of the event horizon.

>> No.6097534

>>6097501
this is true

>> No.6097641

>>6097027
Because gravity is a distortion in space-time, which propagates at the speed of light. Pic related.

>> No.6097644
File: 10 KB, 977x427, gravity.png [View same] [iqdb] [saucenao] [google]
6097644

>>6097641
Forgot pic.

>> No.6097652

>>6097027
and this is why gravitational waves don't exist. GW would allow the interchange of information in and out from an event horizon.

>> No.6098021

>>6097027
Gravity doesn't have self interaction... the coupling constant with the gravitational field, if mediated by graviton, is 0. It is mathematically inconsistent, with our current knowledge, for the coupling constant of the graviton with the gravitational field to not be 0.

In other words, the electron interacts with the electric field, but the gravitation doesn't interact with the gravitational field.

>sources: my ass