25 research outputs found
On the fractional abstract Schrodinger type evolution equations on the Hilbert space and its applications to the fractional dispersive equations
In this paper we prove the local and global well-posedness of the time
fractional abstract Schr\"odinger type evolution equation on the Hilbert space
and as an application, we prove the local and global well-posedness of the
fractional dispersive equation with static potential under the only assumption
that the symbol of P(D) behaves like a polynomial of highest degree m at
infinity. In appendix, we also give the Holder regularities and the asymptotic
behaviors of the mild solution to the linear time fractional abstract
Schr\"odinger type equation. Because of the lack of the semigroup properties of
the solution operators, we employ a strategy of proof based on the spectral
theorem of the self-adjoint operators and the asymptotic behaviors of the
Mittag-Leffler functions.Comment: 44 pages, 0 figure
Space-time fractional reaction-diffusion equations associated with a generalized Riemann-Liouville fractional derivative
This paper deals with the investigation of the computational solutions of an
unified fractional reaction-diffusion equation, which is obtained from the
standard diffusion equation by replacing the time derivative of first order by
the generalized Riemann-Liouville fractional derivative defined in Hilfer et
al. , and the space derivative of second order by the Riesz-Feller fractional
derivative, and adding a function . The solution is derived by the
application of the Laplace and Fourier transforms in a compact and closed form
in terms of Mittag-Leffler functions. The main result obtained in this paper
provides an elegant extension of the fundamental solution for the space-time
fractional diffusion equation obtained earlier by Mainardi et al., and the
result very recently given by Tomovski et al.. At the end, extensions of the
derived results, associated with a finite number of Riesz-Feller space
fractional derivatives, are also investigated.Comment: 15 pages, LaTe
Application of the generalized Kudryashov method to the Eckhaus equation
In this paper, the generalized Kudryashov method is presented to seek exact solutions of the Eckhaus equation. From these solutions, we can derive solitary wave solutions as a special case. The proposed method is direct, effective and convenient and can be applied to many nonlinear evolution equations in mathematical physics
Coupled FCT-HP for Analytical Solutions of the Generalized Timefractional Newell-Whitehead-Segel Equation
This paper considers the generalized form of the time-fractional Newell-Whitehead-Segel model (TFNWSM) with regard to exact solutions via the application of Fractional Complex Transform (FCT) coupled with He’s polynomials method of solution. This is applied to two forms of the TFNWSM viz: nonlinear and linear forms of the time-fractional NWSM equation whose derivatives are based on Jumarie’s sense. The results guarantee the reliability and efficiency of the proposed method with less computation time while still
maintaining high level of accuracy
Local Fractional Operator for the Solution of Quadratic Riccati Differential Equation with Constant Coefficients
In this paper, we consider approximate solutions
of fractional Riccati differential equations via the application of
local fractional operator in the sense of Caputo derivative. The
proposed semi-analytical technique is built on the basis of the
standard Differential Transform Method (DTM). Some
illustrative examples are given to demonstrate the effectiveness
and robustness of the proposed technique; the approximate
solutions are provided in the form of convergent series. This
shows that the solution technique is very efficient, and reliable;
as it does not require much computational work, even without
given up accuracy
On a Modified Iterative Method for the Solutions of Advection Model
Variational Iterative Method (VIM) has been reported in literature as a powerful semi-analytical method for solving linear and nonlinear differential equations; however, it has also been shown to have some weaknesses such as calculation of unneeded terms, and time-consumption regarding repeated calculations for series solution. In this work, a modified VIM is applied for approximate-analytical solution of homogeneous advection model. The result attest to the robustness and efficiency of the proposed method (MVIM)
On Existence and Uniqueness of Solutions for Semilinear Fractional Wave Equations
International audienceLet Ω be a C 2-bounded domain of R d , d = 2, 3, and fix Q = (0, T) × Ω with T ∈ (0, +∞]. In the present paper we consider a Dirichlet initial-boundary value problem associated to the semilinear fractional wave equation ∂ α t u + Au = f b (u) in Q where 1 1. We first provide a definition of local weak solutions of this problem by applying some properties of the associated linear equation ∂ α t u + Au = f (t, x) in Q. Then, we prove existence of local solutions of the semilinear fractional wave equation for some suitable values of b > 1. Moreover, we obtain an explicit dependence of the time of existence of solutions with respect to the initial data that allows longer time of existence for small initial data