Hamiltonian as the generator of time translations

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SUMMARY

The Hamiltonian, denoted as ##H##, serves as the generator of time translations in classical mechanics, as established by the relationship $$\frac{dF}{dt}=\lbrace F,H\rbrace +\frac{\partial F}{\partial t}$$. This relationship indicates that if a function ##F(q,p)## is not explicitly time-dependent, its time evolution is governed solely by the Poisson bracket with the Hamiltonian, $$\frac{dF}{dt}=\lbrace F,H\rbrace$$. The discussion highlights the relevance of Noether's theorem in understanding symmetries and conservation laws in this context. For further insights, Susskind's classical mechanics course on YouTube, particularly lectures 4 and 8, is recommended.

PREREQUISITES
  • Understanding of Hamiltonian mechanics
  • Familiarity with Poisson brackets
  • Knowledge of Noether's theorem
  • Basic concepts of classical mechanics
NEXT STEPS
  • Watch Susskind's classical mechanics course on YouTube, focusing on lectures 4 (symmetries) and 8 (Poisson brackets)
  • Study the implications of Noether's theorem in various physical systems
  • Explore advanced applications of Hamiltonian mechanics in modern physics
  • Research the mathematical foundations of Poisson brackets and their role in dynamical systems
USEFUL FOR

Students and professionals in physics, particularly those studying classical mechanics, symmetries, and conservation laws, will benefit from this discussion.

Frank Castle
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In literature I have read it is said that the Hamiltonian ##H## is the generator of time translations. Why is this the case? Where does this statement derive from?

Does it follow from the observation that, for a given function ##F(q,p)##, $$\frac{dF}{dt}=\lbrace F,H\rbrace +\frac{\partial F}{\partial t}$$ In particular, if ##F## is not explicitly dependent on time, then $$\frac{dF}{dt}=\lbrace F,H\rbrace $$ Or is there more to it?
 
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Ah poisson brackets!

I think what you are looking for is Noethers theorem.

Susskinds classical mechanics course on youtube, i think lecture 4 (symmetries) and 8 (poisson) will help you.
 

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