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sourena
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Gauss-Bonnet term extrinsic curvature calculations?
In General Relativity if one wants to calculate the field equation with surface term, must use this equation:
S=[itex]\frac{1}{16\pi G}[/itex][itex]\int\sqrt{-g} R d^{4} x[/itex]+[itex]\frac{1}{8\pi G}[/itex][itex]\int\sqrt{-h} K d^{3} x[/itex]
The second term is so-called Gibbons-Hawking boundary term and K is extrinsic curvature.
If one is about to use another Lagrangian, for instance Gauss-Bonnet term, must calculate the new extrinsic curvature, K, associated with this new Lagrangian.
I want to know is there a standard method for calculating K?
I would be grateful if anybody can help me in learning this procedure. Please introduce references if you know some.
In General Relativity if one wants to calculate the field equation with surface term, must use this equation:
S=[itex]\frac{1}{16\pi G}[/itex][itex]\int\sqrt{-g} R d^{4} x[/itex]+[itex]\frac{1}{8\pi G}[/itex][itex]\int\sqrt{-h} K d^{3} x[/itex]
The second term is so-called Gibbons-Hawking boundary term and K is extrinsic curvature.
If one is about to use another Lagrangian, for instance Gauss-Bonnet term, must calculate the new extrinsic curvature, K, associated with this new Lagrangian.
I want to know is there a standard method for calculating K?
I would be grateful if anybody can help me in learning this procedure. Please introduce references if you know some.
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