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Thread: Question about surface gravity

  1. #1 Question about surface gravity 
    Junior Member
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    Hi to everyone i'm a beginner in general relativity and i'm trying to understand which term in the theory gives the value for a surface gravity of a star?
    Im little bit confused for now and this will help me to clear up some things.
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  2. #2  
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    Quote Originally Posted by Sanev View Post
    Hi to everyone i'm a beginner in general relativity and i'm trying to understand which term in the theory gives the value for a surface gravity of a star?
    Im little bit confused for now and this will help me to clear up some things.
    As phrased, your question makes no sense. I can tell you the gravitational acceleration as a function of the Schwarzschild coordinates:



    This looks exactly like the Newtonian formula.
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  3. #3  
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    i meant that if i know the theory well, how i can calculate gravity, what is the method
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  4. #4  
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    Quote Originally Posted by Sanev View Post
    i meant that if i know the theory well, how i can calculate gravity, what is the method
    You wouldn't expect to learn calculus in a forum post, right? Well, you shouldn't expect to master GR that way, either.

    Get a copy of Misner, Thorne and Wheeler. It's over a thousand pages long. You will not "know the theory well" until you have put significant effort into the endeavour. You will likely have to learn some maths along the way.

    You may wish to start with the tutorial posted by Markus here.
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  5. #5  
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    Quote Originally Posted by Sanev View Post
    i meant that if i know the theory well, how i can calculate gravity, what is the method
    The calculation starts with Schwarzschild solution to Enstein's Field Equations.
    It follows by forming the Euler-Lagrange equations.
    See tk's answer....
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