What is White hole: Definition and 27 Discussions

In general relativity, a white hole is a hypothetical region of spacetime and singularity that cannot be entered from the outside, although energy-matter, light and information can escape from it. In this sense, it is the reverse of a black hole, which can be entered only from the outside and from which energy-matter, light and information cannot escape. White holes appear in the theory of eternal black holes. In addition to a black hole region in the future, such a solution of the Einstein field equations has a white hole region in its past. This region does not exist for black holes that have formed through gravitational collapse, however, nor are there any observed physical processes through which a white hole could be formed.
Supermassive black holes (SBHs) are theoretically predicted to be at the center of every galaxy and that possibly, a galaxy cannot form without one. Stephen Hawking and others have proposed that these SBHs spawn a supermassive white hole/Big Bang.

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  1. J

    I What is the Connection Between Black Holes and the Big Bang?

    *********Disclaimer******** Hi, I want to ask this community about some black hole shinanigans. I've spent some time searching for this topic here because I don't want to be the guy who spams a forum with a question already answered a hundred times over. Since none of the threads I found...
  2. E

    I Understanding White Holes: A Guide to Region III in GR

    Trying to follow Townsend's notes; section 2.3 is discussing ways of dealing with the co-ordinate singularity at ##r=2M##, i.e. either by transforming to ingoing EF which cover I & II, outgoing EF which cover I & III, or KS which cover the entire manifold. I got a bit preoccupied with the...
  3. R

    I Is the Big Bang a White Hole? Exploring Possibilities

    We know that black holes exist in the universe, but white holes don't, as far as we know, Although white holes are not an impossibility in GR. Is it reasonable to ask if the big bang singularity is in fact a white hole, and is the only white hole in the Universe? Is the place where everything...
  4. Deepblu

    B What A White Hole Will Look Like?

    White Holes may not exist, but if we discover that they are real and we find one, then: What a white hole will look like? How it will behave? What will be its characteristics (such as gravity, mass, size ..etc) in relation with it's parent black hole? What will be it's effect on nearby stars...
  5. A

    I Negative Mass & White Holes: Does It Create?

    does somebody with a negative mass create a white hole instead of a black hole because of its anti gravity property.
  6. T

    B White Hole as an explanation for the big bang and inflation

    Was the concept of a White Hole ever intended to as a POSSIBLE explanation for the Big Bang, inflation and dark energy expansion of the Universe? Or is it considered crack pottery by the cosmology community? I presume the observable Universe would need to be as small as say a single atom in...
  7. Tengo Preguntas

    Do White Holes Violate 2nd Law of Thermodynamics?

    I have heard (read) much debate over the fundamental problems with white holes, mainly that they violate Thermodynamics by increasing entropy. However, I have also read that a black hole bends space-time enough to "connect" somewhere else as an Einstein-Rosen Bridge. So if the exact same event...
  8. H

    Questions about black holes and wormholes

    Questions about black holes: Various articles mention that it takes infinite amount of time to observe something pass through the event horizon. Does this imply that the redshift observed from afar would carry on forever, that the infalling object would just become dimmer and dimmer, but never...
  9. K

    Can we distinguish between black holes and white holes?

    I know white holes probably don't exist, but I'm having trouble understanding how someone outside the white hole would perceive them. My understanding is that they are time-reversed black holes. I've read that nothing can fall into a white hole, that it is repulsive, and that it continually...
  10. wabbit

    Planck Stars and GR black and white holes

    Rovelli & Vidotto's Planck Stars describes a possible quantum black hole - white hole transition through a quantum bounce somewhat analogous to the LQC bounce. In another thread, @marcus pointed out to me that this was not necessarilly considered the most likely scenario for a QG black hole. Is...
  11. A

    Could the Event Horizon of black holes be the edge of expanding universes?

    I recently read a few articles that contradict Einstein's Singularity theorem. The idea being that black holes are wormholes to other universes; with a white hole on the other side of the black hole (Poplawski's theory). What if instead of being a portal to another universe, the Event Horizon of...
  12. J

    White Hole Theory: Evidence in Our Universe

    Recent data in qm suggest black holes could decompress into a white hole on either our universe or another as such is there any evidence of white holes in our universeSent from my iPhone using Physics Forums Jim P
  13. D

    Do we live in a black hole(or an white hole)

    i had this science project in school on black holes and i came an article stating we live in a black hole theory link -----> http://www.technologyreview.com/view/419827/why-our-universe-must-have-been-born-inside-a-black-hole/ so i was thinking that if our universe is made up inside a black...
  14. J

    Could universe be a blackhole inside a white hole?

    Would it be possible for the universe to exist as a white hole within a black hole? I know about the whole black hole universe theory, though I never really looked into it.
  15. N

    White Hole in Universe: Is the Center Expanding?

    white hole in universe! isn't the center of universe a white hole?( i think)As the center of universe is throwing matter radially(if it is a white hole) outwards at high speed,we are moving away from the centre.This is nothing but the term "expanding universe". does this make sense? thanks.
  16. wolram

    Black Hole White Hole in $\Lambda$CDM Cosmology

    I came by this in Arxiv, i don't understand it all so i thought i would just flag it. arXiv:1106.3666 (cross-list from gr-qc) [pdf, ps, other] More on McVittie's Legacy: A Schwarzschild - de Sitter black and white hole embedded in an asymptotically $\Lambda$CDM cosmology Kayll...
  17. P

    How matter leaves a white hole?

    Now this is my first post here but I've been a reader for some time. Now I have a basic understanding of physics and GR and love to read about cosmology and debate it with different people but I've come up with a few questions that I've been having a hard time to find the answer or understand...
  18. P

    White Hole: What Is It & How Does It Differ from Black Hole?

    what is a white hole and how does it differ from a black hole?
  19. T

    Link White hole and our Universe

    Hello, I'm currently developing a hypothesis on how our universe could be in fact the end of one black hole; a white hole. I've been having difficulties looking for books or research papers to see if this is in fact just a rip from a larger hypothesis or theory. My teacher had told me to visit...
  20. Q

    White Hole Postulation: Can it Exist?

    I have been reading all of the previous threads on this topic, but they are all locked or in some strange stasis state, so I made a new one to get the final answer: Does a white hole have a possibility of existence in our universe, through any means, be it wormhole or alternate universe(s) or...
  21. J

    Exploring the Possibility of a White Hole: Is the Big Bang One?

    Is the big bang a white hole? Ya know, the inverse of a black hole... Any reasons why it can't be?
  22. T

    Is there white hole in the universe?

    i am just concerning that if there is black holes, is there white holes as well?
  23. wolram

    What is the White Hole Model of the Universe?

    http://arxiv.org/abs/astro-ph/0508367 Authors: John G. Hartnett Comments: 7 pages, 6 figures The distance modulus and supernova redshift data, determined by the high-z type Ia supernovae teams, is found to describe a model of the universe that places the Galaxy at the center in a...
  24. T

    What Would Happen if a White Hole Collided with a Black Hole?

    This probably could never happen but hypathetically speaking what would happen if a White Hole Collided with a Black Hole? Sincerely Tim
  25. shintashi

    Was the Big Bang a White Hole ?

    it seems to me that there are many paradigms for the idea of what the first inception of creation was. I have heard of the speed of light being as many as e60 times faster at the big bang, and this is obviously, what we theorize to be the absolute source of all the universe. Well, if a black...
  26. D

    White hole / black hole theory

    white hole black hole theory: so a black hole sucks in matter and energy and crushes it to an infinitly small dense point. ok but then what happens? and what are white holes? do they exist? what do they do? can anyone explain to me about black and white holes and what if any link is...
  27. H

    Exploring the Relationship Between Electrons and Nuclei: A Scientific Inquiry

    i want reply to "Why Do Electrons Move?" (sorry, but the thread is closed..) i think the sun is the white hole. i think all electron comes from the sun. and electron goes into the sub-nucleus. i think sun is not burn out. it will be permanently. from this point of view, i want ask...
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