Questions tagged [white-holes]

In general relativity, a white hole is a hypothetical region of spacetime which cannot be entered from the outside, although matter and light can escape from it.

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What change of coordinates makes a black hole an De Sitter space with a white hole at the other side?

I have seen that Jean-Pierre Petit describes a change in coordinates for the exterior schwarschild solution that connects two minkowski flat spaces: https://www.jp-petit.org/papers/cosmo/2015-...
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On the death and rebirth of universe in a black hole

Suppose in the end there will remain only one very large black hole, others have died. Now this black hole had absorbed all the matter and energy of the universe due to conservation principle. ...
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Is the Universe inside the event horizon of a white hole or a black hole or none? [duplicate]

I have read this question: Is the observable universe analogous to a white hole? But it does not have a satisfying answer. And this one: Is the observable region of the universe within the event ...
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Could a black hole and a white hole cause gravitational waves, if orbiting one another?

I have been puzzled by an idea that I came across while reading about white holes. But I've only just started learning about white holes, so my knowledge is severely limited. It seems I also can't ...
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Can mass still be observed in our universe after moving from a black-hole to a white-hole?

This question is based on the recent papers on LQG black-holes by Abhay Ashtekar. Quantum extension of the Kruskal spacetime and Quantum Transfiguration by Kruskal Black Holes When mass moves from ...
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What Would a White Hole Look Like?

I know it is merely hypothetical, but I am rather curious about what would it look like if it was real. For instance: a Black hole: that would have a 100% black sphere, called the event horizon ...
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Is there some physical interpretation of the parallel exterior region?

Let the maximal extension of the Schwarzschild spacetime be given. It admits as coordinates the Kruskal-Szekeres coordinates $(T,X,\theta,\phi)$ with $$T^2-X^2<1$$ since the singularity occurs at $...
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Do white holes encode the future evaporation of the black hole?

In General Relativity, white holes arise when one formulates Maximal extensions (the process by which coordinate singularities are mapped to new non-degenerate coordinates) to a geometric solution (...
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Are white holes made of exotic matter

I have recently watched Kurzgesagt in a Nutshell's video on Wormholes https://www.youtube.com/watch?v=9P6rdqiybaw and I have been thinking about white holes, and exotic matter. As I understand, white ...
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What physical laws would need to change? [closed]

My fictional worlds reside in a multiverse. More specifically, they reside in a universe within that multiverse that is very similar to ours. But here are some big differences: White holes are in ...
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Why can't white holes exist? [closed]

Why can't white holes exist? Also considering that there are infinite universes with infinite possibilities can there be a universe where white holes can exist and black holes cant, or maybe they can ...
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Is the observable universe analogous to a white hole?

My instinct is no, but my lack of understanding with respects to white holes doesn't tell me why. My thinking is this: The universe is expanding and the further away from us the faster it is expanding....
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Would a white hole have an event horizon?

I know, thee are no white holes. My question is not about their existence. I am asking about the mathematics of the white hole solution. Does it produce an event horizon or is it a naked singularity? ...
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Basics of a white hole

I know a little bit about white holes. I know that they are formed inside eternal black holes. I just need to get my facts clear. As far as I can understand, when an object goes near the event horizon ...
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Why do white holes exist?

Black holes sort of make sense. Too much mass and too much gravity, so nothing leaves it. But how and why (and where and when) can white holes exist? How can any body not let things enter it while it ...
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Direction of time inside Schwarzchild black holes

How do we know that the direction of increasing time inside the event horizon a Schwarzchild black hole is that of decreasing $r$, instead of increasing $r$? Both directions would be timelike, but how ...
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What does a white hole look like?

If I were looking at a black hole with an accretion disk, I presume it would appear something like this: I.e., the black hole is as black as black can be, and the disk on the far side of the hole is ...
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Are black and white holes linked? [duplicate]

Theoretically, if black holes are entrances where you are sucked in and you appear somewhere else, do we come out of a white hole? I ask this because a white hole is the opposite of a black hole that ...
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Is a black hole the opposite of a cosmic gusher? [closed]

If a black hole sucks things into it and a white hole ejects things, then do objects absorbed by black holes exit from a white hole?
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Are White Holes the inside of Black Holes?

I read about a theory that says that The Big Bang could be actually considered a White Hole. Than I started thinking. White Hole: an unreachable region from which stuff can come out. Black Hole: a ...
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Black hole- white hole interaction

What if a white hole and a black hole of identical size, mass and rotation(same magnitude, opposite direction) meet each other head on? The white hole would try to push away the black hole and the ...
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Black hole and critical mass? [closed]

I keep hearing about big bang, but there are no white holes and no black hole has been observed exploding. So is there a point in which a black hole reaches critical mass?
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White holes as dark energy? [closed]

I apologise right away for the possibly incompetent question, but I am not a physicist, and this just came to my mind without really thinking much about it. On one hand we struggle to find white ...
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Is the universe actually formed according to the big bang theory? [closed]

Big-Bang pretty much explain the origin of universe, but still many people don't believe it. Isn't it possible that our universe come out of a white hole which have been pulled out from a black hole ...
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Is there a way to move a black hole?

Is it possible to move or transport a black hole? What about a white hole?
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What are White Holes?

What are white holes? How do they affect spacetime? A black hole has extreme gravity which bends the spacetime fabric, but what does a white hole do? Also, what are they made of?
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Can humans make white holes [closed]

I have a question that i could not find on any site on the internet. do humans have the ability to create white holes, and if so could it be used to stabilize a wormhole.
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Could the black hole in the center of the galaxy be a white hole?

In the center of the galaxy there is a strong radio source which we call Sagittarius A*. Based on the high speed and orbit of nearby stars we have calculated that something with the mass of more than ...
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Are black holes in a binary system with white holes, and are they both wormholes? [closed]

What is a black hole? The general explanation is that a black hole is small region in space with such strong gravitational effects that nothing can escape and even light is trapped inside of the event ...
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Where does light go after it enters a black hole?

Nothing passes through a black hole. Where do things go then? If light enters a black hole, what happens to it? Do things go to a white hole and resume in another universe?
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What does white hole look like on a graph paper?

Like a black hole looks like this, what does a white hole looks like? The reason I ask is because I would've imagined that it would look like the exact opposite, i.e. piercing out upwards. But it ...
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207 views

How long does a black hole last after it becomes white hole?

According to Stephen Hawking's theory of black holes, once a sufficient mass has been lost through evaporation, the escape velocity $3 \times 10^8$ meters per second so light is able to escape from ...
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Another universe in the other side of a black hole? [duplicate]

A common notion is that there is another universe in the other side of a black hole, past the singularity point....is this true? does it have any scientific support?
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White Hole Formation and Queries

How do white holes form? Why are they called the "time-reversed" versions of a black hole? What's an "eternal" black hole? How come a white hole is only encountered if you remove the star from the ...
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White Hole Formation [duplicate]

How does a white hole form in nature if it were to exist? No knowledge of general relativity or advanced mathematics but doing a researching a physics project and need a basic explanation.
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Eternal Black Holes

What is the definition of an eternal black hole? Studying white holes and the term appears in relation to this field of research.
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Theory of black holes producing matter or antimatter [closed]

One of my friends gave a theory about the formation of black holes. He said that: Black holes are formed when an extremely massive star collapses in its own gravity to produce a particle of ...
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Is a black hole really connecting two parallel universes? [duplicate]

What is beyond the point of singularity in a black hole and universe expands in all the three $x$, $y$ and $z$ axis? So how can one thing be on top of another when we don't know where the end point ...
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black holes and white holes

i have a question and i just couldn't get another way to get its answer. My question is regarding black hole and the possibility of a white hole. we know that even light cannot escape a black hole ...
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What would happen in a collision of an antimatter singularty and a matter singularity? [duplicate]

Would energy be released if a black hole made out of antimatter and another of matter were to collide?
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Wormholes with event horizons?

Under General Relativity, Lorentzian wormholes (the kind that are traversable) require exotic matter (a kind of unobtainium which is not known to exist). On the other hand, we know black holes exists ...
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White hole and Schwarzschild solution

What is the relation between white hole and the Schwarzschild solution commonly found in textbooks of physics and interpreted usually as black hole?
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Membrane-reversed black holes and their relationship to white-holes

We usually think of white holes as 'thermodynamically reversed black-holes', and this kind of membranes have not been observed in our universe. However, there is some other kind of 'topologically ...
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Diving into a charged (Reissner-Nordstrom) Black hole

Apparently there are two event horizons in this type of black hole, where the second one is known as the Cauchy horizon. According to Carroll, if you go into the first one, you will fall until you ...
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Is it possible that a black hole sucks energy that is the origin of another universes big bang?

The universe expanded from nothing, right? And black holes may be a "gate" to parallel universes, is it possible that stars that is being sucked in by black holes in our universe may be the origin of ...
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Where do black holes go?

According to many physicists, any matter near a black hole is obviously gravitated towards it, and transported to a parallel universe. As far as i know, black holes are made up of material particles, ...
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Do new universes form on the other side of black holes?

I have four questions about black holes and universe formations. Do new universes form on the other side of black holes? Was our own universe formed by this process? Was our big bang a black hole ...
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Why are white holes the same thing as black holes in quantum gravity?

Why are white holes the same thing as black holes in quantum gravity? Their Penrose diagrams in semiclassical gravity are utterly different.
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Does black hole complementarity apply to white holes?

If physics is time reversal invariant, there ought to be white hole complimentarity as well. Imagine a white hole so enormous that it is possible for life to evolve entirely within it for billions of ...
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Collision of a black hole & a white hole

A black hole and white hole experience a direct collision. What happens? What shall be the result of such a collision?