time-reversal invariance

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• time reversal invariance — noun : a principle in physics: if a given sequence of events is physically possible the same sequence in the opposite order is also possible …   Useful english dictionary

• Philosophy of space and time — is the branch of philosophy concerned with the issues surrounding the ontology, epistemology, and character of space and time. While such ideas have been central to philosophy from its inception, the philosophy of space and time was both an… …   Wikipedia

• Discrete-time Fourier transform — In mathematics, the discrete time Fourier transform (DTFT) is one of the specific forms of Fourier analysis. As such, it transforms one function into another, which is called the frequency domain representation, or simply the DTFT , of the… …   Wikipedia

• T-symmetry — is the symmetry of physical laws under a time reversal transformation mdash;: T: t mapsto t.Although in restricted contexts one may find this symmetry, the universe itself does not show symmetry under time reversal. This is due to the uncertainty …   Wikipedia

• Reciprocity (electromagnetism) — This page is about reciprocity theorems in classical electromagnetism. See also Reciprocity (mathematics) for unrelated reciprocity theorems, and Reciprocity for more general usages of the term. In classical electromagnetism, reciprocity refers… …   Wikipedia

• Quantum spin Hall effect — The quantum spin Hall state is a state of matter proposed to exist in special, two dimensional, semiconductors with spin orbit coupling. The quantum spin Hall state of matter is the cousin of the integer quantum Hall state, but, unlike the latter …   Wikipedia

• gas — gasless, adj. /gas/, n., pl. gases, v., gassed, gassing. n. 1. Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid. 2. any such fluid or mixture of fluids. 3. any… …   Universalium

• Electron electric dipole moment — The electron electric dipole moment (EDM) d e is, roughly speaking, a measure of the charge distribution within an electron. Within the standard model of elementary particle physics, such a dipole is predicted to be of smaller than 10^{ 40}… …   Wikipedia

• Neutral particle oscillation — In particle physics, neutral particle oscillation is the transmutation of a neutral particle with nonzero internal quantum numbers into its antiparticle. These oscillations and the associated mixing of particles gives insight into the realization …   Wikipedia

• Fitch, Val Logsdon — ▪ American physicist born March 10, 1923, Merriman, Neb., U.S.       American particle physicist who was corecipient with James Watson Cronin (Cronin, James Watson) of the Nobel Prize for Physics in 1980 for an experiment conducted in 1964 that… …   Universalium

• Kramers theorem — The Kramers degeneracy theorem states that the energy levels of systems with an odd number of electrons remain at least doubly degenerate in the presence of purely electric fields (ie. no magnetic fields). It is a consequence of the time reversal …   Wikipedia