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Books > Science & Mathematics > Physics > Relativity physics
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The Physics of Time Reversal (Paperback, 2nd ed.)
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The Physics of Time Reversal (Paperback, 2nd ed.)
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The notion that fundamental equations governing the motions of
physical systems are invariant under the time reversal
transformation (T) has been an important, but often subliminal,
element in the development of theoretical physics. It serves as a
powerful and useful tool in analyzing the structure of matter at
all scales, from gases and condensed matter to subnuclear physics
and the quantum theory of fields. The assumption of invariance
under T was called into question, however, by the 1964 discovery
that a closely related assumption, that of CP invariance (where C
is charge conjugation and P is space inversion), is violated in the
decay of neutral K mesons.
In The Physics of Time Reversal, Robert G. Sachs comprehensively
treats the role of the transformation T, both as a tool for
analyzing the structure of matter and as a field of fundamental
research relating to CP violation. For this purpose he reformulates
the definitions of T, P, and C so as to avoid subliminal
assumptions of invariance. He summarizes the standard phenomenology
of CP violation in the K-meson system and addresses the question of
the mysterious origin of CP violation. Using simple examples based
on the standard quark model, Sachs summarizes and illustrates how
these phenomenological methods can be extended to analysis of
future experiments on heavy mesons. He notes that his reformulated
approach to conventional quantum field theory leads to new
questions about the meaning of the transformations in the context
of recent theoretical developments such as non-Abelian gauge
theories, and he suggests ways in which these questions may lead to
new directions of research.
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