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Thread: Lightspeed Beyond an EH

  1. #1 Lightspeed Beyond an EH 
    Forum Senior Booms's Avatar
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    Sep 2008
    The perceptual schematic known as earth
    just a thought

    Black Holes are so immensely powerful not even light can escape beyond the black hole's Event Horizon

    Light cannot escape, logically the gravitational pull must at least be equal to lightspeed, if not greater.
    Black Holes grow, which means they consume matter/energy, this means logically, the gravitational pull is stronger than LS meaning anything past the EH travels faster than light

    I'm sure I've missed something, so let me know

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  3. #2  
    sox is offline
    Forum Masters Degree sox's Avatar
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    Sep 2008
    Uk - Scotland
    There are two problems here which are causing you to get confused.

    1) You're thinking of gravitational strength in terms of light speed.

    2) You're thinking about this classically in terms of force as opposed to relativistically in terms of curvature.

    If you go and take a look at some visualisations of black holes, it might help you visualise whats going on.

    Out of interest how good are you at maths? If your allright with a bit of advanced calculus you might be able to read a text on black hole event horizons and singularities. Its VERY interesting stuff.

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  4. #3  
    Moderator Moderator Dishmaster's Avatar
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    Apr 2008
    Heidelberg, Germany
    Yeah, you got it wrong here. It all depends on the escape velocity that is the minimum velocity needed to escape a gravitational potential. In a classical sense (e.g. for the Earth) it can be scribed as

    i.e. a larger mass M increases the necessary escape velocity v, a larger distance r decreases it. The situation is not very different for black holes. The event horizon of a black hole is defined as the radius, where the escape velocity is the speed of light. So, if the mass increases, the radius naturally must increase in the same way in order keep the definition. It does not increase the speed of light. The definition of the event horizon or Schwarzschild radius relies on the speed of light being constant. If you could compress the sun to a sphere of only about 3 km in radius, you would produce a black hole.
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