**Time-reversibility of Dynamics**

The Newton and the SchrÃ¶dinger equations in the absence of the macroscopic magnetic fields and in the inertial frame of reference are T-invariant: if *X(t)* is a solution then *X(-t)* is also a solution (here *X* is the vector of all dynamic variables, including all the coordinates of particles for the Newton equations and the wave function in the configuration space for the SchrÃ¶dinger equation).

There are two sources of the violation of this rule:

- First, if dynamics depend on a pseudovector like the magnetic field or the rotation angular speed in the rotating frame then the T-symmetry does not hold.
- Second, in microphysics of weak interaction the T-symmetry may be violated and only the combined CPT symmetry holds.

Read more about this topic: Microscopic Reversibility

### Famous quotes containing the word dynamics:

“Anytime we react to behavior in our children that we dislike in ourselves, we need to proceed with extreme caution. The *dynamics* of everyday family life also have a way of repeating themselves.”

—Cathy Rindner Tempelsman (20th century)