Any empty vacuum space light can not travel in the Universe?

[alpha2cen]

According to general relativity theory, in the very high gravity Black hole, the existence of void space is no problem. But some problems remain. Which state does Black hole exist? Many neutrons or black hole particle or many quark gluons, ..., which state is correct? Does mass and gravity have a proportional relationship at the high gravity region?

[ACG52]

Right, no citation. Just your reasoning.

[John Cuthber]

Anything near a black hole will orbit round it, loose energy as gravity waves and, eventually fall in.

So any black hole will be "feeding" unless it is surrounded by an absolute vacuum.

But it has been accepted that no such absolute vacuum exists.

Thus there are no "non feeding" black holes.

[Airbrush]

Anything near a black hole will orbit round it, loose energy as gravity waves and, eventually fall in.

So any black hole will be "feeding" unless it is surrounded by an absolute vacuum.

But it has been accepted that no such absolute vacuum exists.

Thus there are no "non feeding" black holes.

 

Very interesting point. I hadn't thought of that. Since space around a black hole has a few atoms drifting around, those atoms get sucked into the black hole, and the space surrounding the black hole becomes less dense and the more dense space further away from the black hole will fill whatever void the black hole creates. So there should be an endless stream of atoms falling into a black hole, and that would be so tiny we could not detect it.

 

But, as those individual atoms fall into the stellar mass black hole, it will take a very tiny fraction of a second for those atoms to reach the singularity. So, inside the black hole will not be a total vacuum, just much closer to it by Trillions of Trillions of times more rarified than the space outside the event horizon.

Edited June 12, 2012 by Airbrush

[ACG52]

The radius of the supermassive BH at our galactic center is estimated to be about 6.25 light hours, so it's going to take significantly longer than a tiny fraction of a second.

 

And ours is not a particularly large BH, as galactic BHs go.

[Airbrush]

The radius of the supermassive BH at our galactic center is estimated to be about 6.25 light hours, so it's going to take significantly longer than a tiny fraction of a second.

 

And ours is not a particularly large BH, as galactic BHs go.

 

I said that about a STELLAR mass black hole which has an event horizon radius of only a few kilometers.

 

"...But, as those individual atoms fall into the stellar mass black hole, it will take a very tiny fraction of a second for those atoms to reach the singularity."

Edited June 12, 2012 by Airbrush

[John Cuthber]

Very interesting point. I hadn't thought of that. Since space around a black hole has a few atoms drifting around, those atoms get sucked into the black hole, and the space surrounding the black hole becomes less dense and the more dense space further away from the black hole will fill whatever void the black hole creates. So there should be an endless stream of atoms falling into a black hole, and that would be so tiny we could not detect it.

 

But, as those individual atoms fall into the stellar mass black hole, it will take a very tiny fraction of a second for those atoms to reach the singularity. So, inside the black hole will not be a total vacuum, just much closer to it by Trillions of Trillions of times more rarified than the space outside the event horizon.

Perhaps you should have thought before posting.

In any event it remains that case that, for a big enough black hole, there's no reason why the particles should disappear quickly on any particular time-scale.

It would need to be a very big black hole to encompass the whole of history (essentially the size of the visible universe, I think) but there's no reason to suppose that particles disappear quickly.

 

Also, once you start talking about densities that low you need to worry about the fact that any particle isn't strictly localised in space.

All particles are everywhere.

[alpha2cen]

We do not exactly know how light travel through the vacuum space. First, we consider light as a particle. According to Newton's 1st law, it seems like no problem moving through the vacuum space. Can we apply Newton's law of motion only moving at the speed of light? Then, we consider light as a wave. If so, how does the medium work during moving in the vacuum space?