Tunneling as a stochastic process: A path-integral model for microwave experiments

2003 ◽  
Vol 67 (6) ◽  
Author(s):  
A. Ranfagni ◽  
R. Ruggeri ◽  
D. Mugnai ◽  
A. Agresti ◽  
C. Ranfagni ◽  
...  
2000 ◽  
Vol 113 (23) ◽  
pp. 10642-10650 ◽  
Author(s):  
L. Larrimore ◽  
R. N. McFarland ◽  
P. A. Sterne ◽  
Amy L. R. Bug
Keyword(s):  

Author(s):  
Chandra Halim ◽  
M. Farchani Rosyid

The implementation of Lévy path integral generated by Lévy stochastic process on fractional Schrödinger equation has been investigated in the framework of fractional quantum mechanics. As the comparison, the implementation of Feynmann path integral generated by Wiener stochastic process on Schrödinger equation also has been investigated in the framework of standard quantum mechanics. There are two stochastic processes. There are Lévy stochastic and Wiener stochastic process. Both of them are able to produce fractal. In fractal’s concept, there is a value known as fractal dimension. The implementation of fractal dimension is the diffusion equation obtained by using Fokker Planck equation. In this paper, Lévy and Wiener fractal dimension have been obtained. There are  for Lévy and 2 for Wiener/Brown fractal dimension. Fractional quantum mechanics is generalization of standard quantum mechanics. A fractional quantum mechanics state is represented by wave function from fractional Schrödinger equation. Fractional Schrödinger equation is obtained by using kernel of Lévy path integral generated by Lévy stochastic process. Otherwise, standard quantum mechanics state is represented by wave function from standard Schrödinger equation. Standard Schrödinger equation is obtained by using kernel of Feynmann path integral generated by Wiener/Brown stochastic process.  Both Lévy and Feynmann Kernel have been investigated and the outputs are the Fourier Integral momentum phase of those kernels. We find that the forms of those kernels have similiraty. Therefore, we obtain Schrödinger equation from Lévy and Feynmann Kernel and also the comparison of Lévy energy in fractional quantum mechanics and particle energy in standard quantum mechanics.


2000 ◽  
Vol 12 (10) ◽  
pp. 1325-1344 ◽  
Author(s):  
OSCAR BOLINA ◽  
PIERLUIGI CONTUCCI ◽  
BRUNO NACHTERGAELE

We develop a geometric representation for the ground state of the spin-1/2 quantum XXZ ferromagnetic chain in terms of suitably weighted random walks in a two-dimensional lattice. The path integral model so obtained admits a genuine classical statistical mechanics interpretation with a translation invariant Hamiltonian. This new representation is used to study the interface ground states of the XXZ model. We prove that the probability of having a number of down spins in the up phase decays exponentially with the sum of their distances to the interface plus the square of the number of down spins. As an application of this bound, we prove that the total third component of the spin in a large interval of even length centered on the interface does not fluctuate, i.e. has zero variance. We also show how to construct a path integral representation in higher dimensions and obtain a reduction formula for the partition functions in two dimensions in terms of the partition function of the one-dimensional model.


1999 ◽  
Vol 13 (09n10) ◽  
pp. 317-323 ◽  
Author(s):  
LUIZ C. L. BOTELHO

We propose an exactly soluble path integral model for stochastic Beltrami fluxes in three-dimensional space-time with a fixed eddie scale. We show further the appearance of a three-dimensional self-avoiding random surface structure for the spatial vortex loop in our exactly soluble turbulence reduced model.


1996 ◽  
Vol 46 (S2) ◽  
pp. 1041-1042 ◽  
Author(s):  
Peter Brusov ◽  
Natali Brusova ◽  
Paul Brusov
Keyword(s):  

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