Conservation of the Laplace-Runge-Lenz Vector

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SUMMARY

The conservation of the Laplace-Runge-Lenz (LRL) vector in a two-body system can be demonstrated using the Hamiltonian framework. To establish its conservation, one can compute the time derivative of the LRL vector and show that it equals zero. The discussion highlights the challenge of deriving this conservation directly from the Hamiltonian, particularly when attempting to relate it to energy calculations. The use of commutators is also mentioned as a potential method to facilitate this analysis.

PREREQUISITES
  • Understanding of Hamiltonian mechanics
  • Familiarity with the Laplace-Runge-Lenz vector
  • Knowledge of commutator calculations in quantum mechanics
  • Basic principles of two-body systems in classical mechanics
NEXT STEPS
  • Study Hamiltonian mechanics in detail
  • Explore the derivation of the Laplace-Runge-Lenz vector
  • Learn about commutators and their applications in quantum mechanics
  • Investigate energy conservation principles in two-body systems
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Students and researchers in classical mechanics, physicists studying celestial mechanics, and anyone interested in the mathematical foundations of orbital dynamics.

fisica1988
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Hmm...Latex doesn't seem to be working at the moment...

How does one show the conservation of the Laplace-Runge-Lenz (LRL) vector using the Hamiltonian of the two-body system? Showing it's conserved otherwise it's not hard. You can take the time derivative of the LRL vector and show that it's zero or a couple other ways which I worked out before (I would type it out but Latex seemingly disabled makes it tedious and cumbersome). The one thing I can't figure out is how to get the conservation of the LRL vector from the Hamiltonian of the two-body system. What I did was take the square of the LRL vector and find the energy from that but then it becomes uncertain.
 
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You know how to calculate commutators?
 
Ah yes yes, thank you, I got it now.
 

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