- #1
khemist
- 248
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I have been watching lecture videos on relativity and I have two questions that have not really been answered yet.
1. What is the physical significance of a contravariant and covariant tensor? I understand the indices are writing either "upstairs" or "downstairs," but in the lecture video, the lecturer seems to claim that it really doesn't matter which is which, except for particular cases.
2. How would one use Einsteins equations to calculate, say, the orbit of mercury? What is the kind of information necessary to find those values? If anyone has any resources about implementing the equations to a problem that would be awesome!
1. What is the physical significance of a contravariant and covariant tensor? I understand the indices are writing either "upstairs" or "downstairs," but in the lecture video, the lecturer seems to claim that it really doesn't matter which is which, except for particular cases.
2. How would one use Einsteins equations to calculate, say, the orbit of mercury? What is the kind of information necessary to find those values? If anyone has any resources about implementing the equations to a problem that would be awesome!