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Fractional Schrödinger equation : ウィキペディア英語版
Fractional Schrödinger equation
(詳細はfractional quantum mechanics. It was discovered by Nick Laskin (1999) as a result of extending the Feynman path integral, from the Brownian-like to Lévy-like quantum mechanical paths. The term ''fractional Schrödinger equation'' was coined by Nick Laskin.〔N. Laskin, (2000), ( Fractional Quantum Mechanics and Lévy Path Integrals. ''Physics Letters'' 268A, 298-304 ).〕
==Fundamentals==

The fractional Schrödinger equation in the form originally obtained by Nick Laskin is:〔N. Laskin, (2002), (Fractional Schrödinger equation, ''Physical Review'' E66, 056108 7 pages ). '' (also available online: http://arxiv.org/abs/quant-ph/0206098)〕
*r is the 3-dimensional position vector,
*''ħ'' is the reduced Planck constant,
*''ψ''(r, ''t'') is the wavefunction, which is the quantum mechanical probability amplitude for the particle to have a given position r at any given time ''t'',
*''V''(r, ''t'') is a potential energy,
*Δ = ∂2/∂r2 is the Laplace operator.
Further,
*''Dα'' is a scale constant with physical dimension () = ()1 − ''α''·()''α''()−''α'', at ''α'' = 2, ''D''2 =1/2''m'', where ''m'' is a particle mass,
*the operator (−''ħ''2Δ)''α''/2 is the 3-dimensional fractional quantum Riesz derivative defined by (see, Ref.());
::
(-\hbar ^2\Delta )^\psi (\mathbf,t)=\frac 1\int d^3pe^|\mathbf|^\alpha \varphi (
\mathbf,t),

Here, the wave functions in the position and momentum spaces; \psi(\mathbf,t) and \varphi (\mathbf,t) are related each other by the 3-dimensional Fourier transforms:
:
\psi (\mathbf,t)=\frac 1\int d^3pe^/\hbar}\varphi (\mathbf,t),\qquad \varphi (\mathbf,t)=\int d^3re^/\hbar }\psi (\mathbf,t).

The index ''α'' in the fractional Schrödinger equation is the Lévy index, 1 < ''α'' ≤ 2. Thus, the fractional Schrödinger equation includes a space derivative of fractional order ''α'' instead of the second order (''α'' = 2) space derivative in the standard Schrödinger equation. Thus, the fractional Schrödinger equation is a fractional differential equation in accordance with modern terminology.〔S. G. Samko, A. A. Kilbas, and O. I. Marichev, Fractional
Integrals and Derivatives, Theory and Applications ~Gordon
and Breach, Amsterdam, 1993〕 This is the main point of the term ''fractional Schrödinger equation'' or a more general term fractional quantum mechanics.〔N. Laskin, (2000), (Fractional Quantum Mechanics, ''Physical Review'' E62, 3135-3145 ). '' (also available online: http://arxiv.org/abs/0811.1769)〕 At ''α'' = 2 fractional Schrödinger equation becomes the well-known Schrödinger equation.
The fractional Schrödinger equation has the following operator form
where the fractional Hamilton operator \widehat_\alpha is given by
:
\widehat_\alpha =D_\alpha (-\hbar ^2\Delta )^+V(\mathbf,t).

The Hamilton operator, \widehat_\alpha corresponds to the classical mechanics Hamiltonian function introduced by Nick Laskin
:
H_\alpha (\mathbf,\mathbf)=D_\alpha |\mathbf|^\alpha +V(\mathbf,t),

where p and r are the momentum and the position vectors respectively.

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