Analytical Methods for Nonlinear Evolution Equations in Mathematical Physics

: In this article, we will apply some of the algebraic methods to ﬁnd great moving solutions to some nonlinear physical and engineering questions, such as a nonlinear (1 + 1) Ito integral di ﬀ erential equation and (1 + 1) nonlinear Schrödinger equation. To analyze practical solutions to these problems, we essentially use the generalized expansion approach. After various W and G options, we get several clear means of estimating the plentiful nonlinear physics solutions. We present a process like-direct expansion process-method of expansion. In the particular case of W (cid:48) = λ G , G (cid:48) = µ W in which λ and µ are arbitrary constants, we use the expansion process to build some new exact solutions for nonlinear equations of growth if it fulﬁlls the decoupled di ﬀ erential equations.


Introduction
Nonlinear partial differential equations are statistical structures used to explain a phenomenon happening among us worldwide. In several applications of science and engineering, nonlinear partial differential equations occur. The same discovery of NPDEs has been carried out with several different algebraic methods (see ). There are many authors searching for the oscillation criteria for NPDEs see [36]. Many applications of the nonlinear phenomena of PDEs are discussed in [37][38][39][40][41][42][43][44][45][46][47][48][49]. Yang et al. [45] have determined the lump solutions to NODEs using the bilinear equation with the logarithmic function. Zhang et al. [46] used an algebraic multigrid method for eigenvalue problems. Ma et al. [47] used the transformed rational function methods to study the exact solutions to (3 + 1) the dimensional Jimbo-Miwa equation. Li et al. proposed the primary form of the (W/G) extension [28]. They used this approach to research Vakhnenko's nonlinear equation practical solutions. Gepreel [42] improved (W/G) to study the exact solutions for nonlinear integro-differential equations. In this paper, we illustrate that the improved (W/G) is generated in many direct methods for finding exact solutions for NPDEs when the parameters take some special values. Many scholars employed an evident expansion of the nonlinear physical problems (W/G) approach [28,29,42]. In this paper, we use modified expansion (W/G), where W, G is random to evaluate evolutionary equations: (i) The ODIDEs [43]: Equation (1) (ii) The HODSEs [44]: where u is the varying slowly envelope of electromagnetic field, t is time, x is a distance along the direction of propagation, S 2 , is dispersive velocity, S 3 , S 4 , 2nd, 3rd, and 4th-order dispersive respectively while L 4 , L 2 are non-linearity coefficients.

The (W/G)-Expansion Direct Method
Suppose the nonlinear partial differential equation where H is a function in Q and its partial derivatives.
Step 3. Determine β by equating the power of highest order and the power of nonlinear term(s) in (5).
Step 6. From the general solutions of algebraic equations and the exact solutions of Equation (8), we construct the exact solutions to evolution equations. A general solution to a general Riccati, Equation (8) was given by three Formulas (40)- (42) in an earlier reference [48]. Fact 1. If G = 1, B = 0, and C = 1 this method equivalence the Tanh-function method, and G = 1, and A, B, C are nonzero constants this method equivalent to the Riccati expansion function method [4,5].
Fact 2. In [29,30] When W = G , A = −µ, B = −λ, and C = −1. This method is equivalent to (G /G)-method [27]. Fact 3. When W = G /G, B = 0. We have a direct method: where a k (k = 0, 1, . . . , β) are constants, and G satisfies the condition which appear in [29,30]. Fact 4. If we put W = GG . We get where a k (k = 0, 1, . . . , β) are constants, and G satisfies NODE: which discussed in [29,30]. and where λ, µ are nonzero, is called (W/G)-expansion method. From Facts 1-5, theoretically, the transformed rational function method [47] gives us a rational function expansion around a solution to an integrable ODE, which is the most general procedure to generate traveling wave solutions. A Riccati equation is just one possibility, of choosing an integrable ODE. . They have discussed the exact solutions when T(η) = η and T(η) = α + η 2 then integrate r-time to determine u. This method is one of the effective and powerful methods to solve nonlinear ODEs. In the proposed method, trial equation is the generalized Riccati ODE (7) or (8), which contains many parameters to get a different type of several traveling wave solutions. The transformed rational function provides a way to construct traveling wave solutions, but not multiple wave solutions. Multiple wave solutions can be computed by using the multiple exp-function method.
3. In [49], the authors construct the multiple solutions for NPDEs, which is a powerful method and determining the one and two solutions. The multiple exp-function method [49] aims to solve PDEs, but not integro-differential equations. Only one-wave and two-wave solutions are computed in [49], since N wave solutions, for example, N-soliton solutions need more elaborate theoretical consideration [50].

Exact Solutions for Nonlinear Physical Problems
In this section, we use the (G /G 2 )-expansion method, (G )-direct method and (W/G)-expansion method to discuss the analytical solutions for some of the nonlinear physical problems.

Abundant Solutions to of the (1 + 1)-IIDEs
We use the transformation The transformation (15) changes the NIIDS (1) to We take the transformation where k is a velocity nonzero constant. Therefore, Equation (17) leads to write Equation (16) to NODE: Using the integration, Equation (18) takes the form: where C 1 is a constant.
In this part, we deduce the direct exact solution to Equation (19) by using (G /G 2 )-expansion method. Equating the power of the highest derivative with the power of nonlinear terms in (19), we suppose the solution of Equation (19) has the following form: where r 0 and r 1 are constants and G(Θ) satisfies Equation (10). Equation (20) is a solution to Equation (19) when where r 0 , C and A are nonzero arbitrary constants. The general solutions of Equation (10) lead to discuss the following families: and Consequently, periodic wave for the (1+1)-IIDEs (1) takes the form: Family 2. If. CA < 0, In this family, the solitary wave solution for (1+1) IIDEs (1) takes the form: In this subsection, we deduce the different types of exact solutions to (19) using (G )-expansion method. We suppose the solution of Equation (19) has the following form: where r 0 and r 1 are constants and G(Θ) satisfies (12). Equation (27) along with the condition (12) is a solution of Equation (19) when The general solutions of (12) leads to discuss the following families: Consequently, periodic wave solution to (1+1)-IIDs (1) takes the form: The solution (30) is bright soliton solution see Figure 1.

Bright, Dark, and Singular, Solitary Solutions of (1 + 1)-DIIDs
In this subsection, we include some figures to illustrate the types of exact solutions to (1 + 1) DIIDs. When the parameters are taken some special values, we graph special figures to illustrate the optical solutions (see Figures 1-4).
Consequently, the hyperbolic solution of the (1+1)-IIDEs (1) takes the form: The solution (32) is bright soliton solution see Figure 2.   We use a new direct method, namely (W/G)-expansion method to find the solution of Equation (19). Let where r 0 and r 1 are constants and W(Θ), G(Θ) satisfies the decouple differential Equation (14). Equation (33) along with condition (14) is a solution of Equation (19) when There are many families, as follows: Family 5. If. λ > 0 and µ > 0, then Equation (14) leads to: In this family, a solitary solution of Equation (1) is given by Solution (36) is a dark soliton solution, see Figure 3.  Family 6. If. λ < 0 and µ < 0, then Equation (14) leads to: In this family, the solitary solution of Equation (1) is given by where Θ = x − 4 λµt. Family 7. If. λ > 0 and µ < 0, then Equation (18) leads to: Consequently, the periodic solution of Equation (1) takes the form: The singular periodic solution (40) appears in Figure 4.  In the above figures, we illustrate the periodic soliton solution as you are shown in Figure 1, bright soliton solution in Figure 2, dark soliton solution appear in Figure 3 while the singular periodic solutions in Figure 4 to the (1 + 1)-DIIDEs.

Exact Solutions to Nonlinear Dispersive Schrodinger Equation (NDSE)
In this section, we study the solution of NDESs where is the varying slowly envelope of electromagnetic field, is time, is a distance along the direction of propagation, 2 , is dispersive velocity , 3 , 4 , 2nd, 3 rd , and 4th-order dispersive respectively while 4 , 2 are non-linearity coefficients. Equation (41) has been discussed in [42] using first integral and sub-equations ODE methods.

Bright, Dark, and Singular, Solitary Solutions of (1 + 1)-DIIDs
In this subsection, we include some figures to illustrate the types of exact solutions to (1 + 1) DIIDs. When the parameters are taken some special values, we graph special figures to illustrate the optical solutions (see Figures 1-4).
In the above figures, we illustrate the periodic soliton solution as you are shown in Figure 1, bright soliton solution in Figure 2, dark soliton solution appear in Figure 3 while the singular periodic solutions in Figure 4 to the (1 + 1)-DIIDEs.

Exact Solutions to Nonlinear Dispersive Schrodinger Equation (NDSE)
In this section, we study the solution of NDESs where u is the varying slowly envelope of electromagnetic field, t is time, x is a distance along the direction of propagation, S 2 , is dispersive velocity, S 3 , S 4 , 2nd, 3rd, and 4th-order dispersive respectively while L 4 , L 2 are non-linearity coefficients. Equation (41) has been discussed in [42] using first integral and sub-equations ODE methods.
where (Θ) is a real function, and q, ω, k, and p are constants. Substituting transformation (42) into Equation (41), we get: and Provided S 3 − S 4 p 0. Differentiating Equation (44) and substituting the result into Equation (43), we have ODE: where the coefficients B 1 , C 1 , D 1 and E 1 are given by Balancing, the highest derivative with nonlinear term 5 in Equation (45), to get β = 1 2 . Consequently, suppose the solution in the form: From (45) and (47), we have

The (W/G)-Expansion Method for NDSEs
We take the solution of Equation (48) in the following form: Equation (57) along with the condition (12) is a solution of Equation (48) when where a 1 , λ, µ are arbitrary nonzero constants and λµ ≥ 0. There are many families of the exact solutions for Equation (12), discussed as the following families: Set 5. If λ > 0 and µ > 0, the solution to NSDEs (2) takes the form: In the special case when A 1 0 and A 2 = 0, the singular solutions is given by Moreover, when A 2 0 and A 1 = 0 the dark solutions is given by The soliton solution (61) is shown in Figure 6.
Re(u7) Im(u7) abs(u7) Re(u7) Im(u7) abs(u7) In the above figures, we illustrate the bright solution solutions as you are shown in Figure 5, and the singular soliton solutions in Figure 6, to the NDSEs.

Conclusions
We developed a modern straightforward approach for designing precise solutions to nonlinear physics and engineering issues. Expanding (W/G) to nonlinear PDEs creates algebraic methods, for instance. We used this framework to address different forms of wave movement solutions, including optical solutions, a single wave solution, and wave sole solutions. We also used the suggested approaches of physics and technology as a significant issue, such as (1 + 1), the Ito integrated differential equation, and the Schrodinger non-linear, higher-order dispersion equation. This method is generalized to many other methods, such as the (G'/G)-expansion method, the tanh function method, and the Riccati expansion method, when the parameters are taken some special chosen. This method can be used to study many nonlinear physical problems in Quantum mechanics and Fluid mechanics. This way, questions that are more complicated will be addressed. We generated a diagram to display the form of wave solutions available.  (6) of Equation (2) and its projection at t = 0 when µ = 3, λ = 5, k = 3, p = 2, q = 0.5, ω = 1, r 1 = 3.

Set 6.
If λ < 0 and µ < 0, in this set, the exact solution Equation (12) is given by: Consequently, the solitary wave solution of Equation (2) has the following form: If A 1 0 and A 2 = 0 the dark soliton solutions is given by and A 2 0 and A 1 = 0 the bright soliton solutions is given by

Bright and Singular Solitary Solutions to NDSEs
We include graphs to show the physical representation of the wave solutions when the constant parameters are taken some special real number values; see Figures 5 and 6.
In the above figures, we illustrate the bright solution solutions as you are shown in Figure 5, and the singular soliton solutions in Figure 6, to the NDSEs.

Conclusions
We developed a modern straightforward approach for designing precise solutions to nonlinear physics and engineering issues. Expanding (W/G) to nonlinear PDEs creates algebraic methods, for instance. We used this framework to address different forms of wave movement solutions, including optical solutions, a single wave solution, and wave sole solutions. We also used the suggested approaches of physics and technology as a significant issue, such as (1 + 1), the Ito integrated differential equation, and the Schrodinger non-linear, higher-order dispersion equation. This method is generalized to many other methods, such as the (G /G)-expansion method, the tanh function method, and the Riccati expansion method, when the parameters are taken some special chosen. This method can be used to study many nonlinear physical problems in Quantum mechanics and Fluid mechanics. This way, questions that are more complicated will be addressed. We generated a diagram to display the form of wave solutions available.