| 单词 | time reversal |
| 释义 | > as lemmastime reversal time reversal n. a reversal of the passage of time; (Physics) a transformation in which the passage of time (and so all velocities) is imagined to be reversed; frequently attributive. ΘΚΠ the world > matter > physics > quantum theory > quantum mechanics > quantum field theory > [noun] > time reversal time reversal1954 1922 I. Fisher Making of Index Numbers iv. 64 The time reversal test... The index number reckoned forward should be the reciprocal of that reckoned backward. 1954 Philos. Sci. 21 85 While time, in our experience, flows in only one direction, the basic laws of mechanics (in so far as they do not contain odd derivatives or odd functions of t) are invariant with respect to time reversal. 1973 S. W. Hawking & G. F. R. Ellis Large Scale Struct. Space-time vi. 182 There are theoretical reasons for believing that all interactions are invariant under the combination of charge, parity and time reversals. 1979 Sci. Amer. (U.K. ed.) June 116/3 The discovery of an electric dipole moment of the neutron would reveal a violation of the physical principle known as time-reversal symmetry. 2008 Science 18 July 339/1 The solution..is ‘time-reversal acoustics’, a strategy that uses echo patterns as a guide for focusing waves through a barrier. < as lemmas |
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