Hindawi Publishing Corporation Journal of Applied Mathematics Volume 2012, Article ID 305945, 14 pages doi:10.1155/2012/305945 Research Article Analytic Approximation of the Solutions of Stochastic Differential Delay Equations with Poisson Jump and Markovian Switching Hua Yang1 and Feng Jiang2 1 2 School of Mathematics and Computer, Wuhan Polytechnic University, Wuhan 430023, China School of Statistics and Mathematics, Zhongnan University of Economics and Law, Wuhan 430073, China Correspondence should be addressed to Feng Jiang, fjiang78@gmail.com Received 2 May 2011; Revised 2 July 2011; Accepted 5 July 2011 Academic Editor: Ying U. Hu Copyright q 2012 H. Yang and F. Jiang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We are concerned with the stochastic differential delay equations with Poisson jump and Markovian switching SDDEsPJMSs. Most SDDEsPJMSs cannot be solved explicitly as stochastic differential equations. Therefore, numerical solutions have become an important issue in the study of SDDEsPJMSs. The key contribution of this paper is to investigate the strong convergence between the true solutions and the numerical solutions to SDDEsPJMSs when the drift and diffusion coefficients are Taylor approximations. 1. Introduction Recently there has been an increasing interest in the study of stochastic differential delay equations with Poisson jump and Markovian switching SDDEsPJMSs. Svı̄shchuk and Kazmerchuk 1 investigated stability of stochastic differential delay equations with linear Poisson jumps and Markovian switchings. While Luo 2 discussed the comparison principle and several kinds of stability of Itô stochastic differential delay equations with Poisson jump and Markovian switching. Besides, Li and Chang 3 discussed the convergence of the numerical solutions of stochastic differential delay equations with Poisson jump and Markovian switching. In the present paper we will further research this topic and our focus is on the convergence of numerical solution to stochastic differential delay equation with Poisson jump and Markovian switching when the coefficients are Taylor approximations. Stochastic differential delay equation with Poisson jump and Markovian switching may be considered as extension of stochastic differential delay equation with Poisson jump. Of course, it may also be regarded as an generalization of stochastic differential delay equation with Markovian switching. Similar to stochastic differential delay equations 2 Journal of Applied Mathematics with Poisson jump, explicit solutions can hardly be obtained for the stochastic differential delay equations with Poisson jump and Markovian switching. Thus appropriate numerical approximation schemes such as the Euler or Euler-Maruyama are needed if we apply them in practice or to study their properties. There is an extensive literature concerning the approximate schemes for either stochastic differential delay equations with Poisson jump or stochastic differential delay equations with Markovian switching 4–12. However, the rate of convergence to the true solution by the numerical solution is different for different numerical schemes 13. Recently, Janković and Ilić 14 have investigated the rate of convergence between the true solution and numerical solution of the stochastic differential equations in the sense of the Lp -norm when the drift and diffusion coefficients are Taylor approximations, up to arbitrary fixed derivatives. Moreover, Jiang et al. 15 generalized the Taylor method to stochastic differential delay equations with Poisson jump. Since the rate of convergence for such a numerical method is faster than the result obtained in 13, in this paper, we intend to generalize the above method to the SDDEsPJMSs case and consider the strong convergence between the true solution and numerical; solution to SDDEsPJMSs if the drift and diffusion coefficients are Taylor approximations, up to arbitrary fixed derivatives. To the best of our knowledge, so far there seem to be no existing results. Therefore, the aim of this paper is to close this gap. In Section 2, we introduce necessary notations and approximation scheme. Then comes our main result that the Taylor approximate solutions will converge to the true solutions of SDDEsPJMSs. The proof of this main result is rather technical so we present several lemmas in Section 3 and then complete the proof in Section 4. 2. Approximation Scheme and Hypotheses Throughout this paper, we let Ω, F, {Ft }t≥0 , P be a complete probability space with a filtration {Ft }t≥0 satisfying the usual conditions i.e., it is increasing and right-continuous while F0 contains all P -null sets. Let C−τ, 0; R be the family of continuous function ξ from −τ, 0 to R with the norm ξ sup−τ≤t≤0 |ξt|. We also denote by CFb 0 −τ, 0; R the family of all bounded, F0 -measurable, C−τ, 0; R-valued random variables and denote p by LFt −τ, 0; R the family of all Ft -measurable, C−τ, 0; R-valued random variables ξ {ξt : −τ ≤ t ≤ 0} satisfying sup−τ≤t≤0 E|ξt|p < κ < ∞, where κ is a positive constant. Let wt, t ≥ 0, be a one-dimensional Brownian motion defined on the probability space and let Nt, t ≥ 0, be a scalar Poisson process with intensity λ which is independent of wt. Let rt, t ≥ 0, be a right-continuous Markov chain on the probability space taking values in a finite state space S {1, 2, . . . , N} with the generator Γ γij N×N given by ⎧ if i / j, ⎨γij δ oδ, P rt δ j | rt i ⎩1 γ δ oδ, if i j, ij 2.1 j while γii − i / j γij . We where δ > 0. Here γij ≥ 0 is the transition rate from i to j if i / assume that the Markov chain r· is independent of the Brownian motion w· and Poisson process Nt. It is well known that almost every sample path of r· is a right-continuous step function with finite number of simple jumps in any finite subinterval of R 0, ∞. Journal of Applied Mathematics 3 Consider stochastic differential delay equations with Poisson jump and Markovian switching of the form dxt ft, xt, xt − τ, rtdt gt, xt, xt − τ, rtdwt ht, xt, xt − τ, rtdNt, 2.2 on the time interval 0, T with initial data ξt ∈ CFb 0 −τ, 0; R being independent of wt and Nt, and r0 i0 ∈ S, where f : 0, ∞ × R × R × S −→ R, j g : 0, ∞ × R × R × S −→ R, j h : 0, ∞ × R × R × S → R. 2.3 j In the paper, fx , gx , and hx denote, respectively, jth-order partial derivatives of f, g and h with respect to x. Further, to ensure the existence and uniqueness of the solution to 2.2, we impose the following hypotheses. H1 f, g, and h satisfy Lipschitz and linear growth condition; that is, there exists a positive constant L > 0 such that ft, x1 , x2 , i − f t, y1 , y2 , i ∨ gt, x1 , x2 , i − g t, y1 , y2 , i 2 2 ∨ ht, x1 , x2 , i − h t, y1 , y2 , i ≤ L x1 − y1 x2 − y2 , 2.4 ft, x1 , x2 , i2 ∨ gt, x1 , x2 , i2 ∨ |ht, x1 , x2 , i|2 ≤ L2 1 |x1 |2 |x2 |2 , for x1 , x2 , y1 , y2 ∈ R and i ∈ S. H2 There exist constants K1 > 0 and γ ∈ 0, 1 such that, for all −τ ≤ s < t ≤ 0 and ρ ≥ 2, E|ξt − ξs|ρ ≤ K1 t − sγ . 2.5 H3 f, g, and h have Taylor approximations in the second argument, up to m1 th, m2 th, and m3 th derivatives, respectively. H4 Partial derivatives of the order m1 1, m2 1, and m3 1 of the functions f, m1 1 m 1 m 1 g, and h, fx t, x, y, i, gx 2 t, x, y, i, and hx 3 t, x, y, i, are uniformly bounded; that is, there exist positive constants L1 , L2 , and L3 obeying sup m1 1 t, x, y, i ≤ L1 , fx 0,T ×R×R×S sup m2 1 t, x, y, i ≤ L2 , gx 0,T ×R×R×S sup m3 1 t, x, y, i ≤ L3 . hx 0,T ×R×R×S 2.6 4 Journal of Applied Mathematics For some sufficiently large integer M, we define the time step by h τ/M, where 0 < h 1. Then, the approximation solution to 2.2 is computed by yt ξt on −τ ≤ t ≤ 0, and for any t ≥ 0, yt ξ0 t m1 0 t m2 j j gx s, z1 s, z2 s, rs ys − z1 s dws j! j0 0 j j fx s, z1 s, z2 s, rs ys − z1 s ds j! j0 t m3 2.7 j j hx s, z1 s, z2 s, rs ys − z1 s dNs, j! j0 0 where, for tk kh with integer k ≥ 0, z1 t ∞ z2 t ytk Itk ,tk1 t, k0 ∞ ytk − τItk ,tk1 t, rt k0 ∞ k0 rtk Itk ,tk1 t. 2.8 In order to show the strong convergence of the numerical solutions and the exact solutions to 2.2, we will need the following assumption. H5 There exists a positive constant K2 such that E sup |xt| p m12 p ∨ E sup yt ≤ K2 , 0≤t≤T 2.9 0≤t≤T for any p > 0, where m max{m1 , m2 , m3 }. Remark 2.1. H1 shows that the exact solutions to 2.2 admit finite moments; see 15. If m1 m2 m3 0, then H1 shows also that the numerical solutions and the exact solutions admit finite moments see, 1, 3. We can now state our main result of this paper. Theorem 2.2. Under assumptions H1 –H5 , for any p ≥ 2, then p 0. lim E sup xt − yt h→0 2.10 0≤t≤T The proof of this theorem is rather technical. We will present a number of useful lemmas in Section 3 and then complete the proof in Section 4. 3. Lemmas Throughout our analysis, Ci , i 1, 2, . . . denote generic constants, independent of h. In order to prove the main theorem, the following lemmas are useful. Journal of Applied Mathematics 5 Lemma 3.1. If assumptions H1 , H3 , H4 , and H5 hold, then, for 2 ≤ ρ ≤ m 1p, ρ Eyt − z1 t ≤ Chρ/2 , 3.1 t ≥ 0, where C is a positive constant independent of h. Proof. For notation simplicity reason, let us denote that A t, yt, z1 t, z2 t, rt m1 j fx t, z1 t, z2 t, rt j0 j! j yt − z1 t , m2 j j gx t, z1 t, z2 t, rt B t, yt, z1 t, z2 t, rt yt − z1 t , j! j0 3.2 m3 j j hx t, z1 t, z2 t, rt C t, yt, z1 t, z2 t, rt yt − z1 t . j! j0 Obviously, for any t ≥ 0, there exists an integer k ≥ 0 such that t ∈ tk , tk1 . Then, by 2.7 and 2.8 we obtain yt − z1 t yt − ytk t t A s, ys, z1 s, z2 s, rs ds B s, ys, z1 s, z2 s, rs dws tk tk t C s, ys, z1 s, z2 s, rs dNs. tk 3.3 Hence, we have ρ t ρ Eyt − z1 t ≤ 3ρ−1 E A s, ys, z1 s, z2 s, rs ds tk ρ t E B s, ys, z1 s, z2 s, rs dws tk 3.4 ρ t E C s, ys, z1 s, z2 s, rs dNs . tk By the Hölder inequality, we have ρ t t ρ ρ−1 E A s, ys, z1 s, z2 s, rs ds ≤ t − tk EA s, ys, z1 s, z2 s, rs ds. tk tk 3.5 6 Journal of Applied Mathematics By the Burkholder-Davis-Gundy inequality and the Hölder inequality, we yield, for some positive constant Cρ , ρ t E B s, ys, z1 s, z2 s, rs dws tk t ρ ≤ Cρ t − tk ρ/2−1 EB s, ys, z1 s, z2 s, rs ds. 3.6 tk For the jump integral, we convert to the compensated Poisson process Nt : Nt − λt, which is a martingale with 2 t2 t2 2 EC s, ys, z1 s, z2 s, rs ds; E C s, ys, z1 s, z2 s, rs dNs λ t1 t1 3.7 see, for example, 1, 4, 12, 16. By the Burkholder-Davis-Gundy inequality and the Hölder inequality, for some positive constant Cλ,ρ , we then obtain ρ t E C s, ys, z1 s, z2 s, rs dNs tk ρ t t λ E C s, ys, z1 s, z2 s, rs dNs C s, ys, z1 s, z2 s, rs ds tk tk ≤2 ρ−1 ρ t E C s, ys, z1 s, z2 s, rs dNs tk ρ t ρ−1 2 Eλ C s, ys, z1 s, z2 s, rs ds tk ≤ 2ρ−1 Cλ,ρ t − tk ρ/2−1 t ρ EC s, ys, z1 s, z2 s, rs ds tk 2ρ−1 λρ t − tk ρ−1 t tk ρ EC s, ys, z1 s, z2 s, rs ds. 3.8 Journal of Applied Mathematics 7 Now, by the mean value theorem there is a θ ∈ 0, 1 such that J1 t t ρ Ef s, ys, z2 s, rs − f s, ys, z2 s, rs −A s, ys, z1 s, z2 s, rs ds tk m 1 s, z1 s θ ys − z1 s , z2 s, rs fx 1 Ef s, ys, z2 s, rs − m1 1! tk t ρ m1 1 × ys − z1 s ds. 3.9 This, together with H1 , H3 –H5 , yields that J1 t ≤ 2 ρ−1 t 2 ρ/2 E f s, ys, z2 s, rs tk ≤2 ρ−1 t tk ≤2 ρ−1 t m1 1ρ ds E ys − z1 s m1 1!ρ ρ L1 ρ ρ L 2m1 1ρ 3ρ/2 Lρ 1 Eys E|z2 s|ρ 1 m1 1!ρ ⎤ m1 1ρ × Eys E|z1 s|m1 1ρ ⎦ds ρ L 1 2K2 κ ρ/2 ρ 3 tk L1 2m1 1ρ1 m1 1!ρ K2 ds C1 t − tk . 3.10 Similarly, we can also show that there are two positive constant C2 and C3 for which J2 t t ρ EB s, ys, z1 s, z2 s, rs ds tk ≤ C2 t − tk , t ρ EC s, ys, z1 s, z2 s, rs ds J3 t 3.11 tk ≤ C3 t − tk . Next, since the boundedness of J1 t, J2 t, and J3 t, we then have some positive constant C, independent of h, such that ρ Eyt − z1 t ≤ Chρ/2 . The desired assertion is complete. 3.12 8 Journal of Applied Mathematics Lemma 3.2. If assumptions H1 –H5 hold, then, for 2 ≤ ρ ≤ m 1p, ρ Eyt − τ − z2 t ≤ Chγ , t ≥ 0, 3.13 where γ ∈ 0, 1 and C is a positive constant independent of h. Proof. Clearly, for any t ≥ 0, there exists an integer k ≥ 0 such that t ∈ tk , tk1 . In what follows, we split the following three cases to complete the proof. Case 1. If −τ ≤ tk − τ ≤ t − τ ≤ 0, we then have, from H2 , ρ ρ Eyt − τ − z2 t Eyt − τ − ytk − τ E|ξt − τ − ξtk − τ|ρ ≤ K1 hγ . 3.14 Case 2. If 0 ≤ tk − τ ≤ t − τ, then, by Lemma 3.1, we have ρ Eyt − τ − z2 t ≤ C4 hρ/2 . 3.15 Case 3. If −τ ≤ tk − τ ≤ 0 ≤ t − τ, note that ρ ρ ρ Eyt − τ − z2 t ≤ 2ρ−1 Eyt − τ − ξ0 2ρ−1 Eytk − τ − ξ0 . 3.16 Then, by the above two cases, it follows easily that ρ Eyt − τ − z2 t ≤ C5 hρ/2 hγ . 3.17 Now, combining the three cases altogether, for 2 ≤ ρ ≤ m 1P and γ ∈ 0, 1, ρ Eyt − τ − z2 t ≤ Chγ ; 3.18 where C is a positive constant independent of h. The proof is complete. Lemma 3.3. If assumptions H1 and H5 hold, then, for p ≥ 2, T p 1 h, Ef s, ys, z2 s, rs − f s, ys, z2 s, rs ds ≤ C 3.19 p 2 h, Eg s, ys, z2 s, rs − g s, ys, z2 s, rs ds ≤ C 3.20 p 3 h, Eh s, ys, z2 s, rs − h s, ys, z2 s, rs ds ≤ C 3.21 0 T 0 T 0 1, C 2 , and C 3 are positive constants dependent on max0≤i≤N −γii , but independent of h. where C Journal of Applied Mathematics 9 Proof. Let n T/h be the integer part of T/h. Then T E p |fs, ys, z2 s, rs − f s, ys, z2 s, rs ds 0 3.22 tk1 n f s, ys, z2 s, rs − f s, ys, z2 s, rtk p ds, E k0 tk with tn1 being T . By H1 and H5 , we derive tk1 E ff s, ys, z2 s, rs − f f s, ys, z2 s, rtk p ds tk ≤ 2p−1 E tk1 f s, ys, z2 s, rs p f s, ys, z2 s, rtk p I{rs / rt k } ds tk ≤ 2p Lp E tk1 tk ≤ 2p Lp 3p/2−1 p/2 2 1 ys |z2 s|2 I{rs / rtk } ds tk1 tk ≤ 2p Lp 3p/2−1 tk1 tk 3.23 p E E 1 ys |z2 s|p I{rs / rtk } | rtk ds E E1 2K2 κ | rtk E I{rs / rtk } | rtk ds. Now, by the Markov property 6, we have I{rtk i} P rs / i | rtk i E I{rs / rtk } | rtk i∈S γij s − tk os − tk I{rtk i} i∈S ≤ j /i I{rtk i} max −γij o . i∈S 1≤i≤N So, 3.19 is complete. Similarly, we can show 3.20 and 3.21. 3.24 10 Journal of Applied Mathematics 4. Proof of Theorem 2.2 Let us now begin to prove our main result Theorem 2.2. Clearly, p E sup xt − yt 0≤t≤T t E sup fs, xs, xs − τ, rs − A s, ys, z1 s, z2 s, rs ds 0≤t≤T 0 t gs, xs, xs − τ, rs − B s, ys, z1 s, z2 s, rs dws 0 p hs, xs, xs − τ, rs − Cs, ys, z1 s, z2 s, rsdNs 0 t p t E sup fs, xs, xs − τ, rs − A s, ys, z1 s, z2 s, rs ds 0≤t≤T 0 ≤ 3p−1 p t E sup gs, xs, xs − τ, rs − B s, ys, z1 s, z2 s, rs dws 0≤t≤T 0 p t . E sup hs, xs, xs − τ, rs − C s, ys, z1 s, z2 s, rs dNs 0≤t≤T 0 4.1 So, for any t1 ≤ T , by the Hölder inequality, p t E sup fs, xs, xs − τ, rs − A s, ys, z1 s, z2 s, rs ds 0≤t≤t1 0 ≤T p−1 t1 p Efs, xs, xs − τ, rs − A s, ys, z1 s, z2 s, rs ds. 4.2 0 By the Burkholder-Davis-Gundy inequality, for some positive constant Cp , we have p t E sup gs, xs, xs − τ, rs − B s, ys, z1 s, z2 s, rs dws 0≤t≤t1 0 ≤ Cp T p/2−1 t1 0 p Egs, xs, xs − τ, rs − B s, ys, z1 s, z2 s, rs ds. 4.3 Journal of Applied Mathematics 11 By Doob’s martingale inequality and the compensated Poisson integral, for some positive constant Cλ,p,T , we yield p t E sup hs, xs, xs − τ, rs − C s, ys, z1 s, z2 s, rs dNs 0≤t≤t1 0 ≤ p p−1 p p−1 2 2p−1 λp T p−1 t1 Cλ,p,T t1 p Ehs, xs, xs − τ, rs − C s, ys, z1 s, z2 s, rs ds 0 p Ehs, xs, xs − τ, rs − C s, ys, z1 s, z2 s, rs ds. 0 4.4 Now, by virtue of the assumption H1 , we obtain that J4 t t1 p Efs, xs, xs − τ, rs − A s, ys, z1 s, z2 s, rs ds 0 t1 Efs, xs, xs − τ, rs − f s, ys, z2 s, rs 0 f s, ys, z2 s, rs − f s, ys, z2 s, rs p f s, ys, z2 s, rs − A s, ys, z1 s, z2 s, rs ds t 1 p p−1 ≤3 Efs, xs, xs − τ, rs − f s, ys, z2 s, rs ds 4.5 0 t1 p Ef s, ys, z2 s, rs − f s, ys, z2 s, rs ds 0 t1 p Ef s, ys, z2 s, rs − A s, ys, z1 s, z2 s, rs ds. 0 Moreover, by H1 and Lemma 3.2, we have t1 p Efs, xs, xs − τ, rs − f s, ys, z2 s, rs ds 0 ≤ Lp t1 p E xs − ys |xs − τ − z2 s| ds 0 ≤L 2 p 2p−2 t1 p p p Exs − ys Exs − τ − ys − τ Eys − τ − z2 s ds 0 ≤ Lp 22p−2 t1 0 p p Exs − ys Exs − τ − ys − τ ds Lp 22p−2 T Chγ , 4.6 12 Journal of Applied Mathematics and by Lemma 3.1 and H4 , there exists a θ1 ∈ 0, 1 such that t1 p Ef s, ys, z2 s, rs − A s, ys, z1 s, z2 s, rs ds 0 t1 0 p m1 1 s, z1 s θ1 ys − z1 s , z2 s, rs fx ys − z1 sm1 1p ds E p m1 1! 4.7 p ≤ L1 T C m1 1!p hm1 1p/2 . Hence, by 4.6 and 4.7, together with Lemma 3.3, we yield J4 t ≤ 3 p−1 1h C p L1 T C m1 1!p Lp 22p−2 t1 hm1 1p/2 Lp 22p−2 T Chγ p p E xs − ys E xs − τ − ys − τ ds . 4.8 0 Similarly, we have J5 t t1 p Egs, xs, xs − τ, rs − B s, ys, z1 s, z2 s, rs ds 0 2h C ≤3 p−1 p L2 T C m2 1!p L 2 p 2p−2 t1 hm2 1p/2 Lp 22p−2 T Chγ 4.9 p p E xs − ys E xs − τ − ys − τ ds , 0 J6 t t1 p Ehs, xs, xs − τ, rs − C s, ys, z1 s, z2 s, rs ds 0 ≤3 p−1 3h C L 2 p L3 T C m3 1!p p 2p−2 t1 0 hm3 1p/2 Lp 22p−2 T Chγ p p E xs − ys E xs − τ − ys − τ ds . 4.10 Journal of Applied Mathematics 13 Now we use K to denote a generic positive constant that may change between occurrences. Hence, by 4.2–4.4 and 4.8–4.10, we yield that E p sup xt − yt 0≤t≤t1 m1p/2 ≤ Kh Kh Kh K γ t1 p p Exs − ys Exs − τ − ys − τ ds 4.11 0 m1p/2 ≤ Kh Kh t1 p Kh 2K E sup xs − ys ds . γ 0 0≤r≤s The continuous Gronwall inequality then gives E p sup xt − yt ≤ Kh Khm1p/2 Khγ e2KT . 4.12 0≤t≤T This proof is therefore complete. Remark 4.1. If m1 m2 m3 0, then the approximate scheme 2.7 is reduced to Euler-Maruyama method for stochastic differential delay equations with Poisson Jump and Markovian switching, which has been discussed in 3. Remark 4.2. As is well known, Taylor approximation is effectively applicable in engineering if the equations can be solved explicitly. If not, since polynomials are very useful analytic functions, the approximation in the paper can be useful in other applications of stochastic Taylor expansion, especially in the construction of various time discrete approximations of Itô processes by using Itô-Taylor expansion such as Euler-Maruyama approximation and Milstein approximation, which has order 1/2 and 1, respectively 3, 8, 13. All these show that numerical methods based on Taylor expansions of higher degrees could be improved by combining them with analytic approximations presented in this paper. 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