tex2html_wrap97 = einstein's action. It is diffeomorphism invariant. G is gravity and R is the curvature scalar.

first order formalism= tex2html_wrap98 treated as independent

second order formalism= tex2html_wrap98 treated as christoffel symbols.

Equation of motion: tex2html_wrap100 .

for matter, use: tex2html_wrap101 define tex2html_wrap102 . Then tex2html_wrap103 .




source
psfile jl@crush.caltech.edu index