Einstein field equation

수학노트
http://bomber0.myid.net/ (토론)님의 2011년 11월 8일 (화) 02:27 판
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introduction
  • prerequiste : Riemann tensor, the Ricci tensor, and the Ricci scalar
  • relativistic matter field equation
    \(R_{\mu \nu} - {1 \over 2}g_{\mu \nu}\,R + g_{\mu \nu} \Lambda = {8 \pi G \over c^4} T_{\mu \nu}\)
    where \(R_{\mu \nu}\) is the Ricci curvature tensor, \(R\) the Ricci scalar curvature, \(\Lambda\) is the cosmological constant, \(T_{\mu \nu}\) momentum-energy tensor

 

 

steps to solve an Einstein equation
  • consider a metric, for example
    \(ds^2=-dt^2+e^{2b(t,r)}dr^2+R(t,r)d\phi^2\)
    where b, R are unknown functions
  • find the components of the curvature tensor
  • find the components of the Einstein tensor
  •  

 

 

 

Einstein-Hilbert action

\(S= - {1 \over 2\kappa}\int R \sqrt{-g} \, d^4x \\)

\(\kappa = {8 \pi G \over c^4} \)

 

 

equation of motion

 

 

solutions example : Schwarzschild black hole

 

 

 

solutions example :

 

 

 

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