Suppose the line element is ds2=−A(t,r)2dt2+B2(t,r)dr2+C2(t,r)dθ2+C2sin2θdϕ2.
Since the metric is diagonal, to find the determinant I can multiply the diagonal entries, detgab=g=−A2B2C4sin2θ. I have a few questions about this.
- First off, why do we call the metric determinant g?
- Why isn't it true that g=gabgab=4? Isn't that how g is defined?
- When will it be true that g=1?
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