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VALIDATION NOT IN SIGHT. “However, an explicit proof of the violation of T invariance in the weak interactions would still be desirable. It is possible to think of such experiments, but unfortunately none seems feasible in the near future.” https://lnkd.in/dqXS2nnQ View in LinkedIn

PREDICTION. “With the violation of CP invariance, it is generally believed on the grounds of the CPT theorem that T invariance is also violated.” https://lnkd.in/dqXS2nnQ View in LinkedIn

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REFLECTIONS. “Yet away I turn myself to the holy, ineffable, mysterious Night. Afar lies the world sunk in a deep vault below; desert and solitary is its place. Deep sadness breathes through the chords of the breast. In drops of dew will I sink down and mingle with the dust. The depths of memory, the wishes of youth, the dreams of childhood, the short joys and vain hopes of the whole span of life, come forth in gray robes, like the evening mist after the setting of the sun.” (Novalis, 1772-1801). https://lnkd.in/dNhZS24Q View in LinkedIn

TESTABLE HYPOTHESIS. “It is, however, possible to conceive of a direct test of the violation of CP invariance as illustrated in Figure 13...it is safe to assume that some day this experiment will be done.” https://lnkd.in/dqXS2nnQ View in LinkedIn

WEAK EM NAILED. “However, such a hypothesis was shattered in the summer of 1964 when an experiment done by Christenson, Cronin, Fitch, and Turlay produced conclusive evidence that CP invariance is also not valid for the weak interactions.” https://lnkd.in/dqXS2nnQ View in LinkedIn

ESCHER THE SYMMETRIST. “Figure 12. Drawing by M.C. Escher which can illustrate CP invariance. The drawing is different from its mirror image since in the drawing white knights show left arms while in the mirror image white knights show right arms. The "C/"' image of the drawing is obtained from the usual mirror image by switching the colors white and black.” https://lnkd.in/dqXS2nnQ View in LinkedIn

PARTIAL SALVAGE. “In this way some symmetry is lost, but right-left symmetry is still obeyed in a changed sense. (The changed sense of reflection has been illustrated' in a marvelous drawing by the Dutch artist M.C. Escher reproduced in Figure 12).” https://lnkd.in/dqXS2nnQ View in LinkedIn

IF IN DOUBT, REDEFINE. “But for a few years after 1957 it was thought that right-left symmetry could still be salvaged through a changed definition of the mirror image process.” https://lnkd.in/dqXS2nnQ View in LinkedIn

CONUNDRUM.”Why is right-left symmetry almost observed, but not quite? Nobody knows the answer to this question.” https://lnkd.in/dqXS2nnQ View in LinkedIn