Can a black hole become a white hole?

[parthdalal86]

[Moderator's note: Spun off into a new thread due to topic change.]

Is it possible that everything consumed by a black hole is so densely packed that it reaches a point where it becomes a white hole. Big bang theory says that there was a point of immense energy and temperature that caused the big bang. Perhaps it was a white hole and it gave birth to a new universe with all the energy it stored. Perhaps we have not discovered a white hole yet because when it explodes, it gives rise to a new universe aligning with the theory of multiverse where everything exists in the same plain but no light can travel between them and so we can't see these other universes.. An explosion of the white whole may also result in a blackhole slowly fading away.. just a thought

 

[Ibix]

Is it possible

No, white hole spacetimes look nothing like the big bang spacetime. And the big bang was not a point as far as we know.

Black holes are expected to evaporate, but that doesn't lead to a white hole, and stellar mass black holes won't even start evaporating for many times the current age of the universe.

 

[parthdalal86]

No, white hole spacetimes look nothing like the big bang spacetime. And the big bang was not a point as far as we know.

Black holes are expected to evaporate, but that doesn't lead to a white hole, and stellar mass black holes won't even start evaporating for many times the current age of the universe.

How would we even know anything about whiteholes? No one has observed one yet. I will be greatful if you can explain what happens to all the energy consumed by a blackhole before evaporating.. Even if stellar mass black holes aren't evaporating yet, doesn't mean they are not consuming more energy and releasing it through a medium.. we don't even know what has happened in 13.8 billion years so you can't be sure there were no Blackholes that evaporated.. what solid proof do we have? In fact.. perhaps universe is older than 13.8 billion years but that light has even not reached us yet.. what are your thoughts on that??

 

[PeroK]

How would we even know anything about whiteholes? No one has observed one yet. I will be greatful if you can explain what happens to all the energy consumed by a blackhole before evaporating.. Even if stellar mass black holes aren't evaporating yet, doesn't mean they are not consuming more energy and releasing it through a medium.. we don't even know what has happened in 13.8 billion years so you can't be sure there were no Blackholes that evaporated.. what solid proof do we have? In fact.. perhaps universe is older than 13.8 billion years but that light has even not reached us yet.. what are your thoughts on that??

Where I grew up in Scotland, the fish and chip shops sold not only black puddings, but a Scottish delicacy called a white pudding. Just a thought!

 

[Ibix]

How would we even know anything about whiteholes? No one has observed one yet.

We have mathematical models, the ones you are relying on when you talk about white holes at all. They look nothing like the FLRW spacetimes we use for cosmology.

I will be greatful if you can explain what happens to all the energy consumed by a blackhole before evaporating.

That's what the black hole's mass and angular momentum are. Current models break down somewhere inside the black hole, though, so details are limited. It's all eventually emitted as Hawking radiation, though. That's what evaporation is.

what are your thoughts on that??

I think you have no physical model and are simply tossing out science words in some order and hoping that strict adherence to positivist philosophy will make them plausible. I'll merely note that this is against site rules, and duck out of the conversation now

 

[PeterDonis]

How would we even know anything about whiteholes?

We have a theoretical model of white holes. That model is what @Ibix's post was describing.

I will be greatful if you can explain what happens to all the energy consumed by a blackhole before evaporating. Even if stellar mass black holes aren't evaporating yet, doesn't mean they are not consuming more energy and releasing it through a medium

Please be aware that personal speculation is off limits for discussion here. Your statements here do not appear to have any basis in our actual scientific theories.

we don't even know what has happened in 13.8 billion years so you can't be sure there were no Blackholes that evaporated.. what solid proof do we have?

There is no such thing as "proof" in science. The best science can do is to give you models so you can compare their predictions with data. Our best current scientific models are the ones that best match the data we currently have.

Our best current scientific model of our universe is what tells us that the universe is 13.8 billion years old, and our best estimate of what happened during all that time.

Our best current scientific model of black holes is what tells us that they take way, way longer than 13.8 billion years to evaporate--about $10^{70}$ years for a black hole of ten solar masses.

That's the best that science can give you.

perhaps universe is older than 13.8 billion years but that light has even not reached us yet.. what are your thoughts on that??

This is also personal speculation and is off limits here.

 

[PeterDonis]

Big bang theory says that there was a point of immense energy and temperature that caused the big bang.

And when the universe was in this state, it was also expanding very, very rapidly. It was nothing like a black hole or a white hole.

Perhaps it was a white hole and it gave birth to a new universe with all the energy it stored. Perhaps we have not discovered a white hole yet because when it explodes, it gives rise to a new universe aligning with the theory of multiverse where everything exists in the same plain but no light can travel between them and so we can't see these other universes.. An explosion of the white whole may also result in a blackhole slowly fading away.. just a thought

All of this is personal speculation and is off limits here. Please be advised.

 

[PeterDonis]

And with that, this thread is closed. Thanks to all who provided good responses.