Boundary value problem of a nonlinear Langevin equation with two different fractional orders and impulses
© Wang et al.; licensee Springer 2012
Received: 15 March 2012
Accepted: 5 October 2012
Published: 6 November 2012
In this paper, we study a new type of a Langevin equation involving two different fractional orders and impulses. Sufficient conditions are formulated for the existence and uniqueness of solutions of the given problems.
MSC:34A08, 34B10, 34B37, 46N10.
Fractional derivatives provide an excellent tool for the description of memory and hereditary properties of various materials and processes. These characteristics of the fractional derivatives make the fractional-order models more realistic and practical than the classical integer-order models. In fact, fractional differential equations appear naturally in a number of fields such as physics, geophysics, polymer rheology, regular variation in thermodynamics, biophysics, blood flow phenomena, aerodynamics, electro-dynamics of complex medium, viscoelasticity, Bode’s analysis of feedback amplifiers, capacitor theory, electrical circuits, electron-analytical chemistry, biology, control theory, fitting of experimental data, nonlinear oscillation of earthquake, the fluid-dynamic traffic model, etc. For more details and applications, we refer the reader to the books [1–3]. For some recent development on the topic, see [4–15] and the references therein.
It is well known that a Langevin equation is widely used to describe the evolution of physical phenomena in fluctuating environments [16–18]. However, for the systems in complex media, an integer-order Langevin equation does not provide the correct description of the dynamics. One of the possible generalizations of a Langevin equation is to replace the integer-order derivative by a fractional-order derivative in it. This gives rise to a fractional Langevin equation, see [19–22] and the references therein.
In 2008, Lim, Li and Teo  firstly introduced a new type of a Langevin equation with two different fractional orders. The solution to this new version of a fractional Langevin equation gives a fractional Gaussian process parametrized by two indices, which provides a more flexible model for fractal processes as compared with the usual one characterized by a single index. In 2009, Lim and Teo  discussed the fractional oscillator process with two indices. In 2010, by using the contraction mapping principle and Krasnoselskii’s fixed point theorem, Ahmad and Nieto  studied a Langevin equation involving two fractional orders with Dirichlet boundary conditions. Recently, the existence of solutions for a three-point boundary value problem of a Langevin equation with two different fractional orders has also been studied in .
where C D is the Caputo fractional derivative, , , , , , , , , where and denote the right and the left limits of at (), respectively. has a similar meaning for . Let . Evidently, is a Banach space endowed with the sup-norm .
where , , are given constants and .
Impulsive differential equations, which provide a natural description of observed evolution processes, are regarded as important mathematical tools for the better understanding of several real world problems in applied sciences. The theory of impulsive differential equations of integer order has found its extensive applications in realistic mathematical modeling of a wide variety of practical situations and has emerged as an important area of investigation. The impulsive differential equations of fractional order have also attracted a considerable attention and a variety of results can be found in the papers [41–51].
To the best knowledge of the authors, no paper has considered nonlinear Langevin equations involving two different fractional orders and impulses, i.e., problems (2.1), (3.1) and (3.2). This paper fills this gap in the literature.
This paper is organized as follows. In Section 2, we present some preliminary results. Consequently, problem (2.1) is reduced to an equivalent integral equation. Then, by using the fixed point theory, we study the existence and uniqueness of a Dirichlet boundary value problem for nonlinear Langevin equations involving two different fractional orders and impulses. In Section 3, we indicate some generalizations to nonlocal Dirichlet boundary value problems. The last section is devoted to an example illustrating the applicability of the imposed conditions. These results can be considered as a contribution to this emerging field.
2 Dirichlet boundary value problem
Definition 2.1 A function with its Caputo derivative of fractional order existing on is a solution of (2.1) if it satisfies (2.1).
Lemma 2.1 
Lemma 2.2 
for some , , .
2.1 Existence result
for some .
for some .
for some . Combining with , we get that .
for some .
for some .
Substituting the value of in (2.8) and (2.12) and letting , we can get (2.3). Conversely, assume that u is a solution of the impulsive fractional integral equation (2.3). Then by a direct computation, it follows that the solution given by (2.3) satisfies (2.2). This completes the proof. □
2.2 Nonlinear problem
Theorem 2.1 Assume that
Then problem (2.1) has a unique solution provided , where Λ is given by (2.14).
Then the equation (2.1) has a solution if and only if the operator T has a fixed point.
As , therefore, A is a contraction. Thus, the conclusion of the theorem follows by the contraction mapping principle. □
3 Nonlocal Dirichlet boundary value problems
For the forthcoming analysis, we need the following assumptions:
(H2) There exists a constant such that .
(H3) There exists a constant such that .
Theorem 3.1 Assume (H1), (H2) hold if , then problem (3.1) has a unique solution, where Λ is given by (2.14).
Theorem 3.2 Assume (H1), (H3) hold if , then problem (3.2) has a unique solution, where Λ is given by (2.14).
The proofs of Theorem 3.2 and Theorem 3.1 are similar. Here we only prove Theorem 3.1.
The rest of the proof is almost the same as that of Theorem 2.1, so we omit it. □
The following example is a direct application of our main result.
where , , , , , and .
Therefore, by Theorem 2.1, we can get that the above equation (4.1) has a unique solution on .
We would like to express our gratitude to the anonymous reviewers and editors for their valuable comments and suggestions which have improved the quality of the present paper. The research was supported by the Natural Science Foundation for Young Scientists of Shanxi Province (2012021002-3), China.
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