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dhalilsim
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For example:
[itex] D_α D_β D^β F_ab= D_β D^β D_α F_ab
is true or not? Are there any books sources?
[itex] D_α D_β D^β F_ab= D_β D^β D_α F_ab
is true or not? Are there any books sources?
Very thanks to your reply.JorisL said:So you are asking whether ##\nabla_\mu\Box F_{ab} = \Box \nabla_\mu F_{ab}##?
Here I wrote ##\Box = g^{\mu\nu}\nabla_\mu\nabla_\nu## following modern notation.
Have you tried finding the commutator? What is ##[ \nabla_\mu, \nabla_\nu]## equal too?
The (free) lecture notes by Carroll might have what you are looking for. At the least they introduce all you need to calculate the commutator. (I know the book that built on those does have the identities you need)
The D'Alembert operator is a mathematical operator used in physics and differential geometry. It is typically denoted by □ or ∇² and is defined as the sum of the second partial derivatives of a function with respect to the coordinates of a given coordinate system.
In mathematics, two operators are said to "commute" if their order of application does not affect the final result. In the case of the D'Alembert operator and covariant derivative, this means that the order in which they are applied to a function will not change the final outcome.
This is important because it allows for the simplification of calculations in physics and differential geometry. When two operators commute, their order of application can be changed without affecting the final result, making it easier to solve complex equations.
The D'Alembert operator and covariant derivative have many practical applications in physics and mathematics, particularly in fields such as general relativity, quantum mechanics, and differential geometry. They are used to study the behavior of waves, solve differential equations, and describe the curvature of space-time.
The D'Alembert operator is a key component of the wave equation, which describes the behavior of waves in physics. It is used to calculate the second derivative of a function with respect to time, and is crucial in understanding the propagation of waves through various media.