CPT symmetry Guide, Meaning , Facts, Information and Description
CPT-symmetry is a fundamental
symmetry of
physical laws under transformations that involve the inversions of
charge,
parity and
time simultaneously. Efforts in the late 1950s revealed the violation of
P-symmetry by some phenomena that involve
weak nuclear force fields, and there are well known violations of
C-symmetry and
T-symmetry as well. For a short time, the
CP-symmetry was believed to be preserved by all physical phenomena, but was later found to be false too. There is a theorem that derives the preservation of CPT-symmetry for all of physical phenomena assuming the correctness of
quantum laws.
Stephen Hawking explains this, considering a mirror-image of our universe with all objects having
momenta and positions reflected by an imaginary plane (corresponding to a
parity inversion), with all of
matter replaced by
anti-matter (corresponding to a
charge inversion), and reversed in time. The preservation of CPT-symmetry would mean that both the universes will evolve alike, in the sense that, at any moment, they are identical and the CPT transformation would simply take one into another. The symmetry is recognized to be a very fundamental property of physical laws.
See also
This is an Article on CPT symmetry. Page Contains Information, Facts Details or Explanation Guide About CPT symmetry
