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Encyclopedia > CPT invariance

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. Symmetry is a characteristic of geometrical shapes, equations, and other objects; we say that such an object is symmetric with respect to a given operation if this operation, when applied to the object, does not appear to change it. ... A physical law or a law of nature is a scientific generalization based on empirical observations. ... Transformation has two meanings in molecular biology: Transformation is the genetic alteration of a cell resulting from the introduction, uptake and expression of foreign DNA. Transformation is also the process by which normal cells are converted into cells that will continue to divide without limit. ... Electric charge is a fundamental FATTY STASHEconserved property of some subatomic particles, which determines their electromagnetic interactions. ... In physics, a parity transformation (also called parity) is the simultaneous flip in the sign of all spatial coordinates: A 3×3 matrix representation of P would have determinant equal to -1, and hence cannot reduce to a rotation. ... 8:17 am, August 6, 1945, Japanese time. ... P-symmetry is simply the spatial symmetry exhibited during a reflection. ... The weak nuclear force or weak interaction is one of the four fundamental forces of nature. ... C-symmetry means the symmetry of physical laws over a charge-inversion transformation. ... T-symmetry is the symmetry of physical laws under a time-reversal transformation— 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. ... CP-symmetry is a symmetry obtained by a combination of the C-symmetry and the P-symmetry. ... The word quantum, pl. ...


The implication of CPT symmetry is, that 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, will evolve exactly like our universe. At any moment, they are identical and the CPT transformation would simply turn one into the other. The symmetry is recognized to be a very fundamental property of physical laws. In physics, momentum is a physical quantity related to the velocity and mass of an object. ... In physics, a parity transformation (also called parity) is the simultaneous flip in the sign of all spatial coordinates: A 3×3 matrix representation of P would have determinant equal to -1, and hence cannot reduce to a rotation. ... Matter is the substance of which a physical object is composed. ... Antimatter is matter that is composed of the antiparticles of those that constitute normal matter. ... Electric charge is a fundamental FATTY STASHEconserved property of some subatomic particles, which determines their electromagnetic interactions. ...


See also

Poincare symmetry is the full symmetry of special relativity and includes translations (ie, displacements) in time and space (these form the Abelian Lie group of translations on space-time) rotations in space (this forms the non-Abelian Lie group of 3-dimensional rotations) boosts, ie, transformations connecting two uniformly moving... Quantum field theory (QFT) is the application of quantum mechanics to fields. ... In physics, a parity transformation (also called parity) is the simultaneous flip in the sign of all spatial coordinates: A 3×3 matrix representation of P would have determinant equal to -1, and hence cannot reduce to a rotation. ... C-symmetry means the symmetry of physical laws over a charge-inversion transformation. ... T-symmetry is the symmetry of physical laws under a time-reversal transformation. ... CP-symmetry is a symmetry obtained by a combination of the C-symmetry and the P-symmetry. ... In particle physics, Kaons (also called K-mesons and denoted K) are a group of four mesons distinguished by the fact that they carry a quantum number called strangeness. ...

References and external links

  • http://www.lbl.gov/abc/wallchart/chapters/05/2.html
  • Particle data group on CPT

 
 

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