Zobrazeno 1 - 10
of 122
pro vyhledávání: '"De Martino, Salvatore"'
In the present paper we provide the closed form of the path-like solutions for the logistic and $\theta$-logistic stochastic differential equations, along with the exact expressions of both their probability density functions and their moments. We si
Externí odkaz:
http://arxiv.org/abs/2004.10478
In this report we summarize a few methods for solving the stochastic differential equations (SDE) and the corresponding Fokker-Planck equations describing the Gompertz and logistic random dynamics. It is shown that the solutions of the Gompertz SDE a
Externí odkaz:
http://arxiv.org/abs/2002.06409
Publikováno v:
In Accident Analysis and Prevention September 2019 130:108-116
Publikováno v:
Phys. Plasmas 12, 072308 (2005) (7 pages)
We have studied the nonlinear dynamics of whistler waves in magnetized plasmas. Since plasmas and beam-plasma systems considered here are assumed to be weakly collisional, the point of reference for the analysis performed in the present paper is the
Externí odkaz:
http://arxiv.org/abs/physics/0412047
Publikováno v:
Phys. Rev. ST Accel. Beams 6, 034206 (2003)
The formation of the beam halo in charged particle accelerators is studied in the framework of a stochastic-hydrodynamic model for the collective motion of the particle beam. In such a stochastic-hydrodynamic theory the density and the phase of the c
Externí odkaz:
http://arxiv.org/abs/cond-mat/0302382
Publikováno v:
Phys. Rev. E 63, 016501 (2001)
We introduce a description of the collective transverse dynamics of charged (proton) beams in the stability regime by suitable classical stochastic fluctuations. In this scheme, the collective beam dynamics is described by time--reversal invariant di
Externí odkaz:
http://arxiv.org/abs/cond-mat/0302378
Publikováno v:
Mod.Phys.Lett. A16 (2001) 693-706
We show that the characteristic sizes of astrophysical and cosmological structures, where gravity is the only overall relevant interaction assembling the system, have a phenomenological relation to the microscopic scales whose order of magnitude is e
Externí odkaz:
http://arxiv.org/abs/gr-qc/0104052
It is shown that the characteristic observed radius, velocity, and temperature of a typical galaxy can be inferred from Planck action constant through a phenomenological scaling law on all cosmological scales.
Comment: 6 pages, no figures
Comment: 6 pages, no figures
Externí odkaz:
http://arxiv.org/abs/gr-qc/9903106
We perform a detailed analysis of the non stationary solutions of the evolution (Fokker-Planck) equations associated to either stationary or non stationary quantum states by the stochastic mechanics. For the excited stationary states of quantum syste
Externí odkaz:
http://arxiv.org/abs/quant-ph/9901054
Stability and characterisitic geometrical and kinematical sizes of galaxies are strictly related to a minimal characteristic action whose value is of order $h$, the Planck constant. We infer that quantum mechanics, in some sense, determines the struc
Externí odkaz:
http://arxiv.org/abs/gr-qc/9901042