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The wave function of an initially very localized free particle. In quantum physics, a wave function (or wavefunction) is a mathematical description of the quantum state of an isolated quantum system. The most common symbols for a wave function are the Greek letters ψ and Ψ (lower-case and capital psi, respectively).
As originally formulated, the Dirac equation is an equation for a single quantum particle, just like the single-particle Schrödinger equation with wave function (,). This is of limited use in relativistic quantum mechanics, where particle number is not fixed.
In quantum mechanics, wave function collapse, also called reduction of the state vector,[1] occurs when a wave function —initially in a superposition of several eigenstates —reduces to a single eigenstate due to interaction with the external world. This interaction is called an observation, and is the essence of a measurement in quantum ...
The universal wavefunction or the wavefunction of the universe is the wavefunction or quantum state of the entire universe. [1] It is regarded as the basic physical entity [2] in the many-worlds interpretation of quantum mechanics, [3][4][5][6] and finds applications in quantum cosmology. It evolves deterministically according to a wave equation.
The definition of quantum theorists' terms, such as wave function and matrix mechanics, progressed through many stages.For instance, Erwin Schrödinger originally viewed the electron's wave function as its charge density smeared across space, but Max Born reinterpreted the absolute square value of the wave function as the electron's probability density distributed across space; [3]: 24–33 ...
Wave function. Collapse; Experiments. ... A fundamental physical constant occurring in quantum mechanics is the Planck constant ... The Physics of Vibrations and ...
The first assumption of the GRW theory is that the wave function (or state vector) represents the most accurate possible specification of the state of a physical system. . This is a feature that the GRW theory shares with the standard Interpretations of quantum mechanics, and distinguishes it from hidden variable theories, like the de Broglie–Bohm theory, according to which the wave function ...
t. e. In quantum mechanics, the measurement problem is the problem of definite outcomes: quantum systems have superpositions but quantum measurements only give one definite result. [1][2] The wave function in quantum mechanics evolves deterministically according to the Schrödinger equation as a linear superposition of different states. However ...