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meteor
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Looking for Einstein Field Equations, in certain places put that they are 10 and in other places put that they are 16. Which is the correct number?
Originally posted by Zefram
16. Look at http://www.etsu.edu/physics/plntrm/relat/general.htm if you're not sure what's going in that one). About 3/4 of the way down they get to the field equations.
Sure?I have seen that the formula isNo. It is 10. Field eqn is
Einstein Tensor = Energy-Momentum tensor
I've already answer to your first question. Einstein tensor is usually defined as a second rank covariant tensor.
Originally posted by meteor
I trust in your word, but believe me that there are certain pages where it appears like a contravariant tensor:
Originally posted by meteor
In the EFE, in the metric tensor, you have to put the tensor of the metric that you are using? For example if you are using the Minkowski metric you have to put the Minkowski metric tensor, or if you are using the euclidean metric, you have to put the euclidean metric tensor?
another question: how to multiply a tensor with an scalar? Exists any web that explain this?
Einstein Field Equations are a set of mathematical equations developed by Albert Einstein to describe the relationship between matter, energy, and the curvature of space-time in the theory of general relativity.
Einstein Field Equations are important because they provide a framework for understanding the behavior of gravity and its effects on the universe. They have been used to make predictions about the behavior of objects in space, such as the bending of light around massive objects and the existence of black holes.
The Einstein Field Equations can be found in various textbooks and online resources on general relativity and theoretical physics. They are also available in scientific journals and publications.
Einstein's theory of relativity is based on the concept that gravity is not a force between masses, but rather a curvature of space-time caused by the presence of mass and energy. The Einstein Field Equations are the mathematical representation of this theory and describe how matter and energy curve space-time.
Yes, the Einstein Field Equations are still relevant today and are widely used in modern physics and astrophysics. They have been tested and confirmed through numerous experiments and observations, and continue to be a crucial tool for understanding the universe and its behavior.