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alfredblase
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If I have the expression for a Poincaré invariant action, how do I find the variation of the action? Any help/hints much appreciated, thanks ;)
Variation of action is a fundamental concept in physics that describes the change in the action of a physical system as its configuration changes. In simpler terms, it is the difference in the amount of energy needed for a system to go from one state to another.
The principle of least action states that a physical system will follow the path that minimizes the action. This means that the variation of action for any possible path must be equal to zero. In other words, the path taken by a system is the one that requires the least amount of energy.
In classical mechanics, the variation of action is used to derive the equations of motion for a system. It is also used to determine the equilibrium state of a system, as the equilibrium state corresponds to the path with the minimum action.
Yes, variation of action can also be applied to quantum systems. In quantum mechanics, the path with the minimum action corresponds to the most probable path taken by a particle. This is known as the principle of least action in quantum mechanics.
Variation of action has applications in various fields of science, including optics, electromagnetism, and thermodynamics. It is also used in the study of fluid mechanics and in the formulation of the laws of thermodynamics.