I The Lagrangian of a Coherent State

Blabbityblobo667
Messages
1
Reaction score
0
How does one write a Lagrangian of a coherent state of vector fields (of differing energy levels) in terms of the the individual Lagrangians?

I desperately need to know how to know to do this, for a theory of mine to make any progress.

Please stick with me, if I didn't make sense just ask.

P.S. I don't know what level/prefix this question deserves.
 
Physics news on Phys.org
Your question doesn't make sense!
Lagrangians are for systems not individual states of the systems. And actually at that level the notion of states with different energy levels doesn't make sense because at first there is a classical field theory with continuous energy and after quantization, you'll get energy levels.
This lack of knowledge at your side means that you're not qualified to have a theory.
And also PF rules forbid the discussion of personal theories.
 
  • Like
Likes Demystifier and berkeman
Blabbityblobo667 said:
I desperately need to know how to know to do this, for a theory of mine to make any progress.

As Shyan says, PF rules do not permit discussion of personal theories, so your theory itself is off topic here.

Also, your best way of learning how Lagrangians work is to find a good textbook on Lagrangians. As Shyan says, your question as it stands doesn't even make sense, so evidently your knowledge of Lagrangians is very sketchy. Thread closed.
 
  • Like
Likes bhobba
Not an expert in QM. AFAIK, Schrödinger's equation is quite different from the classical wave equation. The former is an equation for the dynamics of the state of a (quantum?) system, the latter is an equation for the dynamics of a (classical) degree of freedom. As a matter of fact, Schrödinger's equation is first order in time derivatives, while the classical wave equation is second order. But, AFAIK, Schrödinger's equation is a wave equation; only its interpretation makes it non-classical...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
Is it possible, and fruitful, to use certain conceptual and technical tools from effective field theory (coarse-graining/integrating-out, power-counting, matching, RG) to think about the relationship between the fundamental (quantum) and the emergent (classical), both to account for the quasi-autonomy of the classical level and to quantify residual quantum corrections? By “emergent,” I mean the following: after integrating out fast/irrelevant quantum degrees of freedom (high-energy modes...
Back
Top