T-symmetry

T-symmetry is the symmetry of physical laws under a time-reversal transformation—

Related Topics:
Symmetry - Transformation

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

:: T: t mapsto -t.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

The universe is not symmetric under time reversal, although in restricted contexts one may find this symmetry. Physicists distinguish time asymmetries that are intrinsic to the dynamic laws of nature, and those that are due to the initial conditions of our universe. The T-asymmetry of the weak nuclear force is of the first kind, while the T-asymmetry of the second law of thermodynamics is of the second kind.

Related Topics:
Weak nuclear force - Second law of thermodynamics

~ ~ ~ ~ ~ ~ ~ ~ ~ ~