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Coherence (physics), the quality of a wave to display a well defined phase relationship in different regions of its domain of definition Hilbert transform , a method of changing phase by 90° Reflection phase shift , a phase change that happens when a wave is reflected off of a boundary from fast medium to slow medium
The phase space of a physical system is the set of all possible physical states of the system when described by a given parameterization. Each possible state corresponds uniquely to a point in the phase space. For mechanical systems, the phase space usually consists of all possible values of the position and momentum parameters.
In physics, the terms order and disorder designate the presence or absence of some symmetry or correlation in a many-particle system. [citation needed]In condensed matter physics, systems typically are ordered at low temperatures; upon heating, they undergo one or several phase transitions into less ordered states.
The phase diagram shows, in pressure–temperature space, the lines of equilibrium or phase boundaries between the three phases of solid, liquid, and gas. The curves on the phase diagram show the points where the free energy (and other derived properties) becomes non-analytic: their derivatives with respect to the coordinates (temperature and ...
Phase conjugation is a physical transformation of a wave field where the resulting field has a reversed propagation direction but keeps its amplitudes and phases.
Phase portrait of damped oscillator, with increasing damping strength. The equation of motion is x ¨ + 2 γ x ˙ + ω 2 x = 0. {\displaystyle {\ddot {x}}+2\gamma {\dot {x}}+\omega ^{2}x=0.} In mathematics , a phase portrait is a geometric representation of the orbits of a dynamical system in the phase plane .
Phase problem, the loss of information (the phase) from a physical measurement; Phase factor, a complex scalar used in quantum mechanics; In continuous Fourier transform, the angle of a complex coefficient representing the phase of one sinusoidal component; The argument or angle of complex numbers is sometimes called the phase
The phase-space formulation is a formulation of quantum mechanics that places the position and momentum variables on equal footing in phase space.The two key features of the phase-space formulation are that the quantum state is described by a quasiprobability distribution (instead of a wave function, state vector, or density matrix) and operator multiplication is replaced by a star product.