- #1
WWCY
- 479
- 12
- Homework Statement
- Derive the metric tensors for the following spacetimes, need help with (1)
- Relevant Equations
- ##ds^2 = g_{\mu \nu} dX^{\mu} dX^{\nu}##
My attempt at ##g_{\mu \nu}## for (2) was
\begin{pmatrix}
-(1-r^2) & 0 & 0 & 0 \\ 0 &\frac{1}{1-r^2} & 0 & 0 \\ 0 & 0 & r^2 & 0 \\ 0 & 0 & 0 & r^2 \sin^2(\theta)
\end{pmatrix}
and the inverse is the reciprocal of the diagonal elements.
For (1) however, I can't even think of how to write the vector ##X^{\mu}##; what exactly are ##U,V##?
Also, what does the question mean by "one of them could describe Minkowski spacetime"? At first glance, the metric tensor for (1) is non-diagonal, which I think rules it out. The metric for (2) is diagonal, and appears to approach the Minkowski metric in the small ##r## limit, which I'm guessing is the answer.
Thanks in advance!