Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Possible Duplicate:
Is it possible to recover Classical Mechanics from Schrödinger’s equation?
Classical Limit of the Feynman Path Integral

In the quantum world we don't have specific trajectories, the particle so to speak goes through all possible paths. In the classical and macroscopic world we have definite paths, and usually one specific trajectory is assigned to a body's motion.

How would you go from a trajectoryless world to trajectoried world?

Are there any theories about this bridge between the two worlds?

I guess there should be such a theory, cause one world is the building block of the other.

share|cite|improve this question

marked as duplicate by Emilio Pisanty, Qmechanic, dmckee Nov 24 '12 at 2:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

This has been addressed in e.g. Classical Limit of the Feynman Path Integral. – Emilio Pisanty Nov 23 '12 at 15:30
Other Possible duplicates: and – Qmechanic Nov 23 '12 at 15:35

There are classical systems without trajectories with the particles 'going through' all possible classical paths. Check for instance Poincaré resonances and the limits of trajectory dynamics.

The concept of trajectory is an approximation both in quantum and classical mechanics (check above ref.); we recover trajectories when the states are localized $\sigma \rightarrow \delta$.

share|cite|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.