Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Which dimension does the black hole belongs?

  1. Jul 27, 2015 #1
    I want to know which dimension does the black hole belongs? Can anyone say which force is responsible for the absorption? In case, if the black holes absorbs everything then were the things might gone?Is that everthing becomes invisible or just blast into pieces?
     
  2. jcsd
  3. Jul 27, 2015 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Black holes are objects in spacetime like all others. In general relativity, spacetime is described with 3+1 dimensions (three in space, one in time).
    Absorption is not the right word. Gravity is responsible for their attraction.
    Everything that crosses the event horizon cannot get back. It goes to the center of the black hole.
     
  4. Jul 27, 2015 #3
    A black hole is an extremely massive object and it therefore it has an immense amount of gravity.
    So much gravity that beyond a certain point of closeness to it (the event horizon), the only direction anything can go is deeper into the gravity well, even light cannot escape beyond that point.
     
  5. Jul 27, 2015 #4
    Is there gravitational force is more? beyond the evenhorizon what happens?
     
  6. Jul 27, 2015 #5
    Is the black hole has any density?
     
  7. Jul 27, 2015 #6
    Anything which has mass has density.
    Nobody can be sure what happens to matter once it's inside the black hole since we can't look inside.
    However there are objects which are nearly like black holes but just a little less massive, these are neutron stars.
    In neutron stars individual atoms are disintegrated into a sea of subatomic particles, mainly consisting of neutrons.
     
  8. Jul 27, 2015 #7
    thank you sir.
     
  9. Jul 27, 2015 #8
    You had mentioned about 3+1 dimension.Which means that you are talking about 4th dimension?
     
  10. Jul 27, 2015 #9
    does the black hole has any shape? if the shape doesn't exist then how can we able to mention the dimension of black hole?
     
  11. Jul 27, 2015 #10
    A black hole doesn't have a surface as such so it's 'shape' isn't definable.
    However we can talk of it's event horizon as having a shape, and like most other large cosmological objects, this is expected to be approximately spherical.
    Most black holes are likely to be spinning, (again as do almost all other large cosmological objects).
    Due to the spin the sphere shape is flattened into what is called an 'oblate spheroid' - most planets are actually oblate spheroids rather than perfect spheres.

    (in the cases of many galaxies this flattened sphere shape goes to an extreme and the results is a broad disk)
     
    Last edited: Jul 27, 2015
  12. Jul 27, 2015 #11
    Possibly, all of the other forces exist there, thought with the amount of pressure and heat, they have have merged. Beyond the event horizon, what happens is unknown, mathematically, things just keep compressing further and further without end.

    Height, width, depth, and time

    When astronomers talk about the radius of a black hole, they are usually referring to the diameter of the event horizon. That's simply the point at which gravity overwhelms light, which is calculable based on the theory of gravity and the formulation for escape velocity. As for the object itself, that's the core in the middle, different theories have different ideas of what the core is, it's most likely either a sphere or a point.

    A spinning point is still a point. The event horizon will have no distortion what so ever because it's not a physical thing. If the core is a sphere like string theory suggests, the idea that there would be centripetal forces is correct, but the amount of force created by the spinning would be next to nothing compared to the force of gravity.
     
  13. Jul 27, 2015 #12
    As far as we know a black hole exists in our 3+1 dimensional space but it itself is considered to be in a state known as singularity so its size is infinitly small and does not consume more that one dimension but its strong gravity bends the space around it so much that it pulls virtually everything into it eve the light which makes a dark region around it and creates an optical illusion that the black hole has large sizes. The gravity of the black hole is dependent on the mass of the star once it was so, the more massive the black hole is the greater will be the size of its event horizon. The event horizon is the region beyond which nothing (even light) can escape the pull of the black hole.

    As of now we are not sure where the matter being pulled into the black hole is going. But there are some possibilities, one of such possibility is that the matter being pulled is torn apart upto the subatomic level and the matter is converted into radiation and being ejected by the black hole. Another of such possibility is the matter is ejected into another part of the space since the black hole might have created a hole in the fabric of space itself.

    The matter sucked into the black hole does not fall directly into the black hole, instead it first enters the accretion disk where the matter gets diffused or its physical properties are lost and then it is in an orbit around the black hole and eventually fall into the black hole in a spiral path.
     
  14. Jul 27, 2015 #13
    Hi
    Really is the fourth dimension exist in our universe?
     
  15. Jul 28, 2015 #14
    I was little confused by your answer. Does 3+1 dimension equals to 3rd dimension or 4th dimension?
     
  16. Jul 28, 2015 #15

    Drakkith

    User Avatar

    Staff: Mentor

    You misunderstand. You and I and everything in the universe exists within 4 separate dimensions. Three of these are spatial dimensions and one is time. Here's what we mean by the word 'dimension'. If we need to specify where an object is or where an event takes place, we can set up something known as a 'coordinate system'. You already know what this is. Anytime you ever see a graph you see a 2-dimensional coordinate system where each point on the graph is represented by two numbers. The first number represents the X-coordinate and the second represents the Y-coordinate. So a point on the graph at (3,5) is located three to the right and five up from the origin (where each axis meets the other).

    Now, that's just a 2-dimensional coordinate system. For the real world we have to add two more. The first one we have to add will give us our three spatial dimensions. Any point in space can be represented by three numbers, one for the X, Y, and Z axes each. In addition to these spatial coordinates, we need a 4th number to represent the point's location in time. (One minute ago, two minutes from now, last year, etc)

    So in my coordinate system I can now label object A as being located at (5, 7, 2, 10), which is 5 meters to the right, 7 up, 2 coming 'out of the screen', and 10 seconds from now (assuming that I set my origin to be at the present).
     
  17. Jul 28, 2015 #16
    Thank you for your explanation.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Which dimension does the black hole belongs?
Loading...