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Research article

Solving the time fractional q-deformed tanh-Gordon equation: A theoretical analysis using controlled Picard's transform method

  • Received: 20 May 2024 Revised: 15 July 2024 Accepted: 12 August 2024 Published: 22 August 2024
  • MSC : 65Qxx, 97Mxx

  • This paper presented the formulation and solution of the time fractional q-deformed tanh-Gordon equation, a new extension to the traditional tanh-Gordon equation using fractional calculus, and a q-deformation parameter. This extension aimed to better model physical systems with violated symmetries. The approach taken involved the controlled Picard method combined with the Laplace transform technique and the Caputo fractional derivative to find solutions to this equation. Our results indicated that the method was effective and highlighted our approach in addressing this equation. We explored both the existence and the uniqueness of the solution, and included various 2D and 3D graphs to illustrate how different parameters affect the solution's behavior. This work aimed to contribute to the theoretical framework of mathematical physics and has potential applications across multiple interdisciplinary fields.

    Citation: Khalid K. Ali, Mohamed S. Mohamed, Weam G. Alharbi, M. Maneea. Solving the time fractional q-deformed tanh-Gordon equation: A theoretical analysis using controlled Picard's transform method[J]. AIMS Mathematics, 2024, 9(9): 24654-24676. doi: 10.3934/math.20241201

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  • This paper presented the formulation and solution of the time fractional q-deformed tanh-Gordon equation, a new extension to the traditional tanh-Gordon equation using fractional calculus, and a q-deformation parameter. This extension aimed to better model physical systems with violated symmetries. The approach taken involved the controlled Picard method combined with the Laplace transform technique and the Caputo fractional derivative to find solutions to this equation. Our results indicated that the method was effective and highlighted our approach in addressing this equation. We explored both the existence and the uniqueness of the solution, and included various 2D and 3D graphs to illustrate how different parameters affect the solution's behavior. This work aimed to contribute to the theoretical framework of mathematical physics and has potential applications across multiple interdisciplinary fields.



    Fractional calculus (FC) and fractional differential equations (FDEs) extending beyond integer orders of differentiation and integration, has garnered broad applications across diverse fields [1,2,3]. In physics, it illuminates anomalous diffusion processes and aids in modeling viscoelastic materials and complex dynamical systems [4,5]. Engineering exploits FC in signal processing, control theory, and electromagnetics, optimizing system performance and designing efficient filters and antennas [6,7,8]. Biomedical applications encompass modeling physiological processes such as drug release kinetics, nerve conduction, and bioelectrical impedance analysis [9,10,11]. Furthermore, FC enhances economic and financial models, refining long-term memory processes in asset price fluctuations and bolstering risk management strategies [12,13]. Its versatility and applicability continue to inspire innovative solutions across interdisciplinary realms, driving progress in various fields.

    The concept of q-deformation, first introduced by Arai, has been integrated into dynamical systems, leading to the breaking of system symmetry. Symmetry breaking occurs when the inherent symmetry of a dynamical system is not evident in its ground or equilibrium state [14]. These q-deformed equations, emerging from the notion of q-deformation which generalizes certain algebraic structures like quantum groups, Lie algebras, and associative algebras, introduce a deformation parameter q that induces significant alterations in their properties compared to classical formulations. They find application in various physical systems in describing the propagation of solitons in optical fibers. Also, it is employed in condensed matter physics to model the dynamics of domain walls in ferromagnetic materials. It also provides a mathematical model for studying nonlinear phenomena in fluid dynamics such as the propagation of waves, the formation of solitons and rogue waves, and the dynamics of vortices and turbulence, as well as having connections to quantum field theory, see [15,16,17].

    H. Eleuch introduced the generalized q-deformed sinh-Gordon equation in 2018, expanding upon the traditional form of the sinh-Gordon equation [18], in the form:

    2yϰ22yt2=[sinhq(yv)]pϖ,t0,0<q1, (1.1)

    where sinhq(y) is in the form:

    sinhq(y)=eyqey2, (1.2)

    and v,p, and ϖ are constants R. Subsequently, it has undergone various modifications and treatments either analytically or numerically in several studies [19,21], culminating in its current form:

    2yϰ22yt2=eϵy[sinhq(yv)]pϖ, (1.3)

    and ϵ is constant R.

    Recently, a new form of q-deformed equations has been introduced in [22] called the q-deformed tanh-Gordon equation. The authors presented an analytical solution using the G/G method, complemented by a numerical solution employing finite difference techniques. We seek to extend the q-deformed tanh-Gordon equation (q-deformed TGE) and express it in fractional format by using the Caputo fractional derivative (CFD) with the goal to find an approximate solution for this equation using the controlled Picard method with Laplace transform and Adomian decomposition. This technique is called controlled Picard transform method (CPTM).

    The controlled Picard method, in conjunction with Laplace transform (LT) and Adomian decomposition, presents a robust strategy for addressing FDEs. This methodology involves a progressive refinement of an initial approximation to approach the exact solution iteratively. Incorporation of the LT enables the conversion of the problem into a set of algebraic equations, simplifying the solving process. Additionally, through Adomian decomposition, FDEs are deconstructed into a series of more manageable differential equations, which are subsequently solved step by step. This technique boasts numerous merits and exhibits computational efficiency, necessitating fewer iterations compared to alternative numerical methods. However, but it has some limitations, that is, convergence depends on the initial conditions, and this method is typically suitable for initial value problems rather than boundary value problems; for more details, see [23].

    The q-deformed TGE as presented in [22] is in the form:

    2yϰ22yt2=[tanhqy(ϰ,t)υ]P(eϵy(ϰ,t)+ζq)ρϖ, (1.4)

    where

    tanhq(y)=eyqeyey+qey, (1.5)

    and υ,ϵ,P,ϖ,ζ, and ρ are constants R. As we mentioned before that Eq (1.4) is recently introduced, its solutions are still limited. It has not been addressed or solved in fractional format thus far. Therefore, this study will provide a concise examination of the solutions of the q-deformed TGE in fractional form using CFD to show the influence of the q deformed parameter with the fractional derivative parameter.

    The time fractional q-deformed TGE (TF q-deformed TGE) under investigation takes the form:

    CDBty(ϰ,t)=2yϰ2[tanhqy(ϰ,t)υ]P(eϵy(ϰ,t)+ζq)ρϖ, (1.6)

    subject to the initial constraints:

    y(ϰ,0)=y0(ϰ,t),yt(ϰ,0)=y0t(ϰ,t),

    where CDBt is the CFD with respect to time, and B is the parameter that expresses the order of fractional derivative (1<B2).

    This paper is structured as follows: Section 2 presents the basics of CFD, the Adomian polynomials, and a detailed explanation of the steps of CPTM. In Section 3, we discuss the existence and uniqueness of the solutions of the proposed equation. In Section 4, we apply the CPTM on the TF q-deformed TGE and present the numerical outcomes for the solution. Section 5 clarifies the results in a form of two and three-dimensional graphs to show the influence of the parameters on each other. Finally, Section 6 provides the final remarks of this investigation.

    In FC there are various fractional derivatives, including Caputo, Riemann-Liouville, Jumarie, Riesz, Caputo-Fabrizio, Atangana-Baleanu, and others, offering versatile tools for modeling complex phenomena in a form of FDEs. Each derivative possesses unique properties and applications tailored to specific problem domains. Focusing on the Caputo fractional derivative, it stands out for its advantageous properties in practical applications. The Caputo derivative incorporates initial conditions naturally, making it well-suited for modeling initial value problems. Furthermore, it exhibits linearity, compatibility with classical calculus, and yields physically meaningful solutions for many physical systems. Its advantages lie in its ability to handle initial conditions straightforwardly, facilitating the solution process for a wide range of FDEs [24,25,26,27].

    Definition 2.1. [2] The Caputo derivative of B order is defined by:

    CDBzF(z)={JBddzF(z),1<B<,ddzF(z),B=, (2.1)

    where JB denotes the Riemann-Liouville fractional integral, which can be expressed as:

    JBF(z)=1Γ(B) z0(zΥ)(B1)F(Υ)dΥ,z>0,BR+, (2.2)

    where, R+ denotes all real positive numbers, and Γ(.) denotes the established Gamma function. The operator JB satisfies the properties below for a,b1:

    JaJbF(z)=Ja+bF(z). (2.3)
    JaJbF(z)=JbJaF(z). (2.4)
    Jazm=Γ(m+1)Γ(m+1+a)zm+a. (2.5)

    CFD satisfies the following properties:

    CDBz[JBF(z)]=F(z). (2.6)
    JB[CDBzF(z)]=F(z)1ı=0Fı(0)zıı!,z>0. (2.7)
    CDBzzm=Γ(m+1)Γ(m+1B)zmB. (2.8)

    Definition 2.2. [2,3] The LT of CFD of order B is defined as:

    L[CDBtF(z)]=SBL(F(z))n1=0SB1F()(0),n1<Bn. (2.9)

    The Adomian decomposition method based on establishing the unknown function p in a form of series of decompositions:

    p==0p. (2.10)

    The components p calculated iteratively. The nonlinear term F(p), such as p2,p3,sinp,ep, etc. can be represented using Adomian polynomials (APs) A in the form:

    F(p)==0A(p0,p1,...,p). (2.11)

    APs find utility in addressing different formats of nonlinearity. Originally proposed by Adomian (see [28]) a methodology for computing these polynomials was subsequently corroborated through formal validations. Further approaches have emerged, encompassing methodologies rooted in Taylor series and analogous techniques, as elucidated in references [29,30,31].

    The calculation of APs, denoted as Ar, for the nonlinear component F(p), can be achieved utilizing the general formula:

    Ar=1r!drdvr[F(r=0vp)]v=0, r=0,1,2,.... (2.12)

    Equation (2.12) can be expanded as:

    A0=F(p0),A1=p1F(p0),A2=p2F(p0)+12!p21F(p0),A3=p3F(p0)+p1p2F(p0)+13!p31F(p0).: (2.13)

    From Eq (2.13), we notice that A0 relies only on p0, A1 relies only on p0 and p1, A2 relies only on p0p2, etc.

    The Picard method was first initiated by Émile Picard in 1890, and it has been modified several times. One crucial modification involves the incorporation of a small parameter indicated by , which regulates the convergence rate and accuracy of the iterative process and also by utilizing the LT that enables the transformation of the differential equation into an algebraic equation, simplifying the solution process, [23,32,33]. In this study, we merge the controlled Picard method with LT and AP to be able to deal with the nonlinear terms; this is because the APs facilitate the decomposition of nonlinear terms, enabling systematic approximation of the solution.

    The following steps summarize how to apply the CPTM to a nonlinear FDE. Assume the general form of the fractional partial differential equation (FPDE):

    CDBty(ϰ,t)+L{y(ϰ,t)}+N{y(ϰ,t)}=Ξ(ϰ,t),t>0,1<B2, (2.14)

    related to the initial constraints:

    y(ϰ,0)=y0,yt(ϰ,0)=y(ϰ,0)t=y0t,

    where, L{y(ϰ,t)} and N{y(ϰ,t)} indicate the linear and nonlinear terms in the equation, while Ξ(ϰ,t) indicates the source term.

    Apply LT to both sides of Eq (2.14),

    L[CDBty(ϰ,t)]+L[L{y(ϰ,t)}+N{y(ϰ,t)}]=L[Ξ(ϰ,t)]. (2.15)

    By using definition 2.2 of LP (2.15) becomes,

    SBL{y(ϰ,t)}n1=0SB1y()(ϰ,0)=L[L{y(ϰ,t)}+N{y(ϰ,t)}]+L[Ξ(ϰ,t)]. (2.16)

    For 1<B2,

    Y(ϰ,S)=1Sy(ϰ,0)1S2yt(ϰ,0)1SBL[L{y(ϰ,t)}+N{y(ϰ,t)}]+1SBL[Ξ(ϰ,t)]. (2.17)

    Apply the inverse Laplace on the Eq (2.17),

    y(ϰ,t)=L1{1Sy(ϰ,0)1S2yt(ϰ,0)1SBL[L{y(ϰ,t)}+N{y(ϰ,t)}]+1SBL[Ξ(ϰ,t)]}, (2.18)

    hence, the recurrence relation of Picard becomes:

    y+1(ϰ,t)=y(ϰ,0)+tyt(ϰ,0)L1{1SBL[L{y(ϰ,t)}+N{y(ϰ,t)}Ξ(ϰ,t)]}. (2.19)

    To merge the parameter into the recurrence relation of Picard formula (2.19), we write Eq (2.14) as:

    Θ(ϰ,t,y(ϰ,t),B)+L{y(ϰ,t)}+N{y(ϰ,t)}Ξ(ϰ,t)=0, (2.20)

    or

    Θ(ϰ,t,y(ϰ,t),B)=0, (2.21)

    hence,

    Θ(ϰ,t,y(ϰ,t),B)=0. (2.22)

    Add and subtract CDBty(ϰ,t) to the left-hand side of Eq (2.22):

    CDBty(ϰ,t)+Θ(ϰ,t,y(ϰ,t),B)CDBty(ϰ,t)=0. (2.23)

    Let

    Θ(ϰ,t,y(ϰ,t),B,)=CDBty(ϰ,t)+Θ(ϰ,t,y(ϰ,t),B). (2.24)

    Therefore, Eq (2.23) can be written in the form:

    CDBty(ϰ,t)+Θ(ϰ,t,y(ϰ,t),B,)=0. (2.25)

    By applying the recurrence formula (2.19) into the relation presented in Eq (2.25), we obtain:

    y+1(ϰ,t)=y(ϰ,0)+tyt(ϰ,0)L1{1SBL[[CDBty(ϰ,t)+Θ(ϰ,t,y(ϰ,t),B)]]}. (2.26)

    The final recurrence relation of Picard takes the form:

    y+1(ϰ,t)=y0(ϰ,t)+(1)yL1{1SBL[L{y(ϰ,t)}+N{y(ϰ,t)}Ξ(ϰ,t)]}, (2.27)

    where y0(ϰ,t)=y(ϰ,0)+tyt(ϰ,0), and =0,1,2,....

    To determine the values of that lead to faster convergence, we plot the relationship between the obtained solution and , called the -curves. The region where the solution converges rapidly corresponds to the part of the curve parallel to the x-axis.

    In this section, we will conduct a theoretical investigation into the TF q-deformed TGE, encompassing examinations of its existence and uniqueness. Equation (1.6) can be written in a general form as:

    CDBty(ϰ,t)=F(y,yϰϰ),1<B2, (3.1)

    with starting constraints:

    y(ϰ,0)=h(ϰ),yt(ϰ,0)=k(ϰ).

    First, let us consider the following important definitions and theorems:

    Definition 3.1. Assume there exists a normed space represented by (y,.). A contraction on y denotes a mapping M:yy satisfying the condition y1,y2y.

    M(y1)M(y2)∥≤εy1y2,

    where ε is a real value [0,1].

    Theorem 3.2. [34] (Banach fixed point theorem) Each contraction mapping within a complete metric space possesses a unique fixed point.

    Theorem 3.3. [35] (Schaefer-Krasnoselskii fixed point theorem) Suppose Y represents a convex subset of a closed and bounded Banach space X, and let M:YY be a mapping that is completely continuous. In such a case, M necessarily possesses a fixed point within M.

    Definition 3.4. Consider C(Ω,R) is a Banach space of all continuous functions from Ω to R with . where y=sup{|y|,(ϰ,t)Ω}.

    According to Eq (3.1), suppose that the following propositions are hold:

    P1: There is a constant δ such that:

    y1ϰϰy2ϰϰδy1y2,

    which is valid for all (ϰ,t)Ω and yC(Ω,R).

    P2: There are constants ϱ1 and ϱ2 such that:

    F(y1,y1ϰϰ)F(y2,y2ϰϰ)ϱ1y1y2+ϱ2y1ϰϰy2ϰϰ,

    which is valid for all (ϰ,t)Ω and yC(Ω,R).

    Theorem 3.5. If the above propositions hold; and if tBΓ(B+1)(ϱ1+δϱ2)<1, then, the problem described in Eq (3.1) possesses a unique solution.

    Proof. We aim to convert the problem stated in Eq (3.1) into a fixed-point problem. For the operator:

    Λ:C(Ω,R)C(Ω,R),
    Λ(y(ϰ,t))=h(ϰ)+tk(ϰ)+JBt(F(y,yϰϰ)),1<B2.

    Clearly, the operator Λ constitutes the solution to the problem. Now, we apply the Banach fixed-point theorem to demonstrate that the operator Λ possesses a fixed point. Let y1,y1C(Ω,R), then for every (ϰ,t)Ω:

    Λy1(ϰ,t)Λy2(ϰ,t)=JBtF(y1,y1ϰϰ)F(y2,y2ϰϰ)JBt(ϱ1y1y2+ϱ2y1ϰϰy2ϰϰ)JBt(ϱ1y1y2+ϱ2δy1y2),

    therefore,

    Λy1(ϰ,t)Λy2(ϰ,t)tBΓ(B+1)(ϱ1+ϱ2δ)y1y2tBΓ(B+1)(ϱ1+ϱ2δ)supy1y2tBΓ(B+1)(ϱ1+ϱ2δ)y1y2.

    Thus, according to the relation tBΓ(B+1)(ϱ1+δϱ2)<1, the operator Λ is identified as a contraction. As an immediate result of the Banach fixed-point theorem, it follows that Λ possesses a unique fixed point, which concludes the theorem's proof.

    Next, we establish the conditions that guarantees the existence of the solution utilizing Schaefer's fixed-point theorem.

    Theorem 3.6. If the following conditions are met, then, the equation presented in (3.1) possesses at least one solution within C(Ω,R):

    Suppose that y:ΩR is continuous, and,

    Condition 1. There is a constant ω>0 in which

    |F(y,yϰϰ)|ω,foreach(ϰ,t)ΩandyC(Ω,R).

    Condition 2. There are two constants η1,η2>0 in which

    |F(y(ϰ1,t1),yϰϰ(ϰ1,t1))F(y(ϰ2,t2),yϰϰ(ϰ2,t2))|η1|y(ϰ1,t1)y(ϰ2,t2)|+η2|yϰ1ϰ1(ϰ1,t1)yϰ2ϰ2(ϰ2,t2)|,

    where (ϰ1,t1) and (ϰ2,t2)Ω, and yC(Ω,R).

    Condition 3. There is a constant >0 in which

    |yϰ1ϰ1(ϰ1,t1)yϰ2ϰ2(ϰ2,t2)||y(ϰ1,t1)y(ϰ2,t2)|,

    for each (ϰ1,t1) and (ϰ2,t2)Ω, and yC(Ω,R).

    Condition 4. There are two constants 1,2>0 in which:

    |y(ϰ1,t1)y(ϰ2,t2)|1|ϰ1ϰ2|+2|t1t2|.

    Proof. Suppose ym is a sequence converging to y in C(Ω,R), then, for each (ϰ,t) Ω, it holds that:

    Λym(ϰ,t)Λy(ϰ,t)=JBtF(ym,ymϰϰ)F(y,yϰϰ).

    By utilizing the relation tBΓ(B+1)(ϱ1+δϱ2)<1, we have

    Λym(ϰ,t)Λy(ϰ,t)tBΓ(B+1)(ϱ1+δϱ2)ymy.

    Since y is continuous, it follows that Λym(ϰ,t)Λy(ϰ,t) tends to zero as m tends to .

    Now, we want to prove that, the mapping Λ maps bounded sets into bounded sets:

    Λy(ϰ,t)=h(ϰ)+tk(ϰ)+JBt(F(y,yϰϰ))h(ϰ)+tk(ϰ)+JBt(ν)h(ϰ)+tk(ϰ)+tBΓ(B+1)ω.

    Hence, Λy(ϰ,t)h(ϰ)+tk(ϰ)+tBΓ(B+1)ω, which means Λy(ϰ,t)<. Next, we want to show that, the mapping Λ is equi-continuous on C(Ω,R). To do that, let (ϰ1,t1),(ϰ2,t2)Ω and ϰ1<ϰ2,t1<t2, then:

    Λy(ϰ1,t1)Λy(ϰ2,t2)=JBtF(y(ϰ1,t1),yϰ1ϰ1(ϰ1,t1))F(y(ϰ2,t2),yϰ2ϰ2(ϰ2,t2))JBt(η1|y(ϰ1,t1)y(ϰ2,t2)|+η2|yϰ1ϰ1(ϰ1,t1)yϰ2ϰ2(ϰ2,t2)|)JBt(η1|y(ϰ1,t1)y(ϰ2,t2)|+η2|y(ϰ1,t1)y(ϰ2,t2)|)tBΓ(B+1)((η1+η2)(1|ϰ1ϰ2|+2|t1t2|))tBΓ(B+1)((η1+η2)(1ϰ1ϰ2+2t1t2)).

    Finally,

    Λy(ϰ1,t1)Λy(ϰ2,t2)tBΓ(B+1)((η1+η2)(1ϰ1ϰ2+2t1t2)). (3.2)

    The right-hand side of the inequality (3.2) tends to zero as ϰ1ϰ2 and t1t2 and it is independent of y, which implies that the mapping Λ:(Ω,R)C(Ω,R) is continuous and completely continuous. As a result of Schaefer's fixed point theorem, we conclude that operator Λ possesses a fixed point, serving as a solution to the problem outlined in Eq (3.1).

    Recall Eq (1.6) once again:

    CDBty(ϰ,t)=2yϰ2[tanhqy(ϰ,t)υ]P(eϵy(ϰ,t)+ζq)ρϖ. (4.1)

    According to the values of the constants υ,P,ϵ,ζ,ρ, and ϖ, we will investigate Eq (4.1) in two cases:

    Case Ⅰ. For ϵ=2,υ=P=ζ=ρ=1, and ϖ=q.

    Using the relations (1.5) and (4.1) can be simplified into the form:

    CDBty=yϰϰe2y,1<B2, (4.2)

    related to the constraints:

    y(ϰ,0)=12ln[R0+R1(E24ν(P2cos(12(kϰ)E24ν)P1sin(12(kϰ)E24ν))2(P1cos(12(kϰ)E24ν)+P2sin(12(kϰ)E24ν))E2)+R2(E24ν(P2cos(12(kϰ)E24ν)P1sin(12(kϰ)E24ν))2(P1cos(12(kϰ)E24ν)+P2sin(12(kϰ)E24ν))E2)2],yt(ϰ,0)=ϑ(P21+P22)E24ν(P1sin(ϰE24νR1+Eϑ22E)P2cos(ϰE24νR1+Eϑ22E))/[2(P1cos(ϰE24νR1+Eϑ22E)+P2sin(ϰE24νR1+Eϑ22E))+((P21P22)cos(ϰE24νR1+Eϑ2E)+2P1P2sin(ϰE24νR1+σϑ2E))], (4.3)

    where R0=R1νE,R2=R1E, and k=R1+Eϑ2E.

    Using the CPTM and employing the recurrence relation presented in Eq (2.27), we get:

    y1(ϰ,t)=y0(ϰ,t)+(1)y0L1{1SBL[y0ϰϰ+e2y0]}, (4.4)

    where y0=y(ϰ,0)+tyt(ϰ,0). To find y2, y3,..., we use APs to extract the nonlinear term e2y, where:

    F(y)=e2y,A0=e2y0,A1=2y1e2y0,A2=2y2e2y0+12!y214e2y0.:

    Hence,

    y2=y0+(1)y1L1{1SBL[y1ϰϰ+2y1e2y0]}. (4.5)

    Using the Mathematica 13.2 software, one can evaluate y1,y2,...; however, due to the extensive computations, we halt at the second term.

    Tables 1 and 2 clarify a comparison between the analytical results in reference [22], the approximated results that we obtained, and the absolute error at different values of ϰ for different time steps. By noticing Figure 3, the region that is parallel to the x-axis is approximately [1,0.1], and this region includes the values of in which the solution converges rapidly. Table 1 represents the comparison at =1 and Table 2 represents the comparison at =0.01. The results we obtained illustrate the efficiency of the CPTM in solving nonlinear FPDEs.

    Table 1.  The analytical results in [22] and the numerical values of y(ϰ,t) presented in Eq (4.5), and absolute error at P1=0.1,P2=0.0001,ν=0.01,R1=0.001,E=0.001, and ϑ=0.4 for B=2 at =1.
    ϰ t=0.01 t=0.1 t=0.2
    Analy. Num. Error Analy. Num. Error Analy. Num. Error
    -10 2.05903 2.05903 9.90 E-7 2.05838 2.05828 9.90 E-5 2.05766 2.05726 3.96 E-4
    -7 2.13198 2.13198 8.59 E-7 2.13101 2.13093 8.60 E-5 2.12994 2.12960 3.44 E-4
    -4 2.22619 2.22619 4.55 E-7 2.22514 2.22510 4.57 E-5 2.22397 2.22379 1.83 E-4
    -1 2.29683 2.29683 1.02 E-7 2.29645 2.29646 1.01 E-5 2.29601 2.29605 3.98 E-5
    2 2.28067 2.28067 5.01 E-8 2.28136 2.28135 4.80 E-6 2.28212 2.28210 1.83 E-5
    5 2.19439 2.19439 6.29 E-7 2.19547 2.19540 6.27 E-5 2.19667 2.19642 2.50 E-4
    8 2.10467 2.10467 9.24 E-7 2.10554 2.10545 9.23 E-5 2.10651 2.10614 3.69 E-4

     | Show Table
    DownLoad: CSV
    Table 2.  The analytical results in [22] and the numerical values of y(ϰ,t) presented in Eq (4.5), and absolute error at P1=0.1,P2=0.0001,ν=0.01,R1=0.001,E=0.001, and ϑ=0.4 for B=2 at =0.01.
    ϰ t=0.01 t=0.1 t=0.2
    Analy. Num. Error Analy. Num. Error Analy. Num. Error
    -10 2.05903 2.05903 1.17 E-8 2.05838 2.05838 1.17 E-6 2.05766 2.05766 4.67 E-6
    -7 2.13198 2.13198 1.05 E-8 2.13101 2.13101 1.06 E-6 2.12994 2.12994 4.26 E-6
    -4 2.22619 2.22619 2.01 E-8 2.22514 2.22514 1.99 E-6 2.22397 2.22398 7.88 E-6
    -1 2.29683 2.29683 7.34 E-8 2.29645 2.29645 7.32 E-6 2.29601 2.29604 2.92 E-5
    2 2.28067 2.28067 5.83 E-8 2.28136 2.28136 5.85 E-6 2.28212 2.28214 2.35 E-5
    5 2.19439 2.19439 5.26 E-9 2.19547 2.19547 5.40 E-7 2.19667 2.19667 2.22 E-6
    8 2.10467 2.10467 1.29 E-8 2.10554 2.10554 1.29 E-6 2.10651 2.10651 5.17 E-6

     | Show Table
    DownLoad: CSV

    Case Ⅱ. For ϵ=P=ρ=2,υ=ζ=1, and ϖ=q2.

    Using the relation (1.5), the TF q-deformed TGE presented in (4.1) transformed into:

    CDBty(ϰ,t)=yϰϰe4y+2qe2y,1<B2, (4.6)

    subject to:

    y(ϰ,0)=ln(R0+(R1(E24ν(P2cos(12kϰE24ν)P1sin(12kϰE24ν))2(P1cos(12kϰE24ν)+P2sin(12kϰE24ν))E2))0.5),yt(ϰ,0)=0.25qE(P21+P22)(E24ν)qν2(k28q2E24ν)/(ν(0.5(P21+P22)q2E2(E24ν)+0.5(P21q2E2(E24ν)+2P1P2qEE24νP22q2E2(E24ν))cos(kϰE24ν)0.5(P21qEE24ν2P1P2q2E2(E24ν)P22qEE24ν)sin(kϰE24ν))), (4.7)

    where R0=q2E2q2E2(E24ν)+q, and R1=2q2Eq2E2(E24ν).

    By substituting into the recurrence relation presented in Eq (2.27), we get:

    y1=y0+(1)y0L1{1SBL[y0ϰϰ+e4y02qe2y0]}, (4.8)

    where y0=y(ϰ,0)+tyt(ϰ,0). To find the higher iterations y2, y3,..., we use APs for the nonlinear term e2y and e4y where e2y expanded before in Case Ⅰ and e4y expanded as follows:

    B0=e4y0,B1=4y1e4y0,::

    hence,

    y2=y0+(1)y1L1{1SBL[y1ϰϰ+4y1e4y02q(2y1e2y0)]}. (4.9)

    We can expand other terms, y3,y4,... to obtain an approximate solution with high accuracy.

    Table 3 shows the values of the analytical solution that was presented in reference [22] and the approximate values we obtained at the same values of all parameters for =0.01. We chose a value of equal to -0.01 because, looking at Figure 6, it becomes apparent that the region where the solution converges more rapidly lies on the interval [1,0.1]. So, any value inside this region gives good accuracy. The results reflect the accuracy of the CPTM as the error is very small.

    Table 3.  The numerical values of the unknown function y(ϰ,t) introduced in Eq (4.9) and the analytical solution obtained in [22], and absolute error at P1=0.4, P2=0.01, ν=0.1, k=0.3,E=0.001, and q=0.001 for B=2 for =0.01.
    ϰ t=0.01 t=0.1 t=0.2
    Analy. Num. Error Analy. Num. Error Analy. Num. Error
    -10 3.35615 3.35615 9.55 E-8 3.35689 3.35688 9.57 E-6 3.35773 3.35769 3.83 E-5
    -7 3.38502 3.38502 6.85 E-8 3.38600 3.38599 6.82 E-6 3.38708 3.38706 2.72 E-5
    -4 3.41786 3.41786 2.72 E-8 3.41877 3.41878 2.81 E-6 3.41978 3.41979 1.16 E-5
    -1 3.43986 3.43986 1.42 E-7 3.44015 3.44016 1.43 E-5 3.44044 3.44049 5.74 E-5
    2 3.43484 3.43484 1.12 E-7 3.43425 3.43426 1.11 E-5 3.43358 3.43362 4.43 E-5
    5 3.40695 3.40695 1.30 E-8 3.40595 3.40595 1.37 E-6 3.40484 3.40484 5.79 E-6
    8 3.37435 3.37435 8.36 E-8 3.37345 3.37344 8.37 E-6 3.37245 3.37242 3.34 E-5

     | Show Table
    DownLoad: CSV

    To examine the influence of different parameters on the equation, particularly the parameter q, we will resolve the second case, this time considering different initial conditions.

    Case Ⅱ under different initial condition. For the TF q-deformed TGE (4.6) constrained by:

    y(ϰ,0)=ln(R0+(R1(E24ν(P1sinh(12kϰE24ν)+P2cosh(12kϰE24ν))2(P1cosh(12kϰE24ν)+P2sinh(12kϰE24ν))E2))0.5),yt(ϰ,0)=(2qE(P21(ν0.25E2)+P22(0.25E2ν))qν2(k28q2E24ν))/(ν((P21P22)q2E2(E24ν)(P21q2E2(E24ν)2P1P2qEE24ν+P22q2E2(E24ν))cosh(kϰE24ν)+(P21qEE24ν+P22qEE24ν2P1P2q2E2(E24ν))sinh(kϰE24ν)), (4.10)

    where R0=qq2E2q2E2(E24ν), and R1=2q2Eq2E2(E24ν).

    Using the iterative scheme that we obtained in Eq (2.27) and substituting with the initial conditions to obtain the sequence of solution:

    y0=y(ϰ,0)+tyt(ϰ,0),y1=y0(ϰ,t)+(1)y0L1{1SBL[y0ϰϰ+e4y02qe2y0]}.: (4.11)

    We can proceed to compute higher terms, but we will halt due to the large and intricate calculations, which constitute the main drawback of this method.

    Table 4 shows the analytical results, our obtained results, and the absolute error between the two values under the same values of parameters for =1. The results are the solution of the TF q-deformed TGE for Case Ⅱ, which is presented in Eq (4.11). The results are at different values of ϰ and at various values of t.

    Table 4.  The obtained values for the function y(ϰ,t) introduced in Eq (4.11), the analytical solution, and the absolute error at P1=0.3,P2=0.4,ν=0.001,k=0.4,E=0.1, and q=0.4 for B=2 and =1.
    ϰ t=0.01 t=0.1 t=0.2
    Analy. Num. Error Analy. Num. Error Analy. Num. Error
    -10 1.76634 1.76633 9.02 E-6 1.71114 1.71013 1.01 E-3 1.65164 1.64712 4.52 E-3
    -7 1.79373 1.79372 8.29 E-6 1.74050 1.73958 9.22 E-4 1.6831 1.67902 4.08 E-3
    -4 1.8219 1.82189 7.61 E-6 1.77047 1.76963 8.40 E-4 1.71497 1.71128 3.69 E-3
    -1 1.85078 1.85078 6.98 E-6 1.8010 1.80024 7.65 E-4 1.74726 1.74391 3.34 E-3
    2 1.88033 1.88033 6.40 E-6 1.83207 1.83137 6.97 E-4 1.77994 1.77691 3.03 E-3
    5 1.9105 1.91050 5.87 E-6 1.86364 1.86300 6.36 E-4 1.81300 1.81025 2.75 E-3
    8 1.94126 1.94125 5.38 E-6 1.89569 1.89511 5.80 E-4 1.84644 1.84394 2.49 E-3

     | Show Table
    DownLoad: CSV

    Table 5 introduces the results that we obtained and the analytical results supported by the absolute error for Case Ⅱ, which its solution is presented in Eq (4.11), but this time at =0.01 and q=0.004.

    Table 5.  The obtained values for the function y(ϰ,t) introduced in Eq (4.11), the analytical solution, and the absolute error at P1=0.3,P2=0.4,ν=0.001,k=0.4,E=0.1, and q=0.004 for B=2 and =0.01.
    ϰ t=0.01 t=0.1 t=0.2
    Analy. Num. Error Analy. Num. Error Analy. Num. Error
    -10 3.49675 3.49675 3.02 E-9 3.49819 3.49819 3.22 E-7 3.49979 3.49978 1.36 E-6
    -7 3.54785 3.54785 2.64 E-9 3.54926 3.54926 2.81 E-7 3.55083 3.55083 1.18 E-6
    -4 3.59811 3.59811 2.33 E-9 3.59950 3.59950 2.47 E-7 3.60105 3.60104 1.03 E-6
    -1 3.64763 3.64763 2.05 E-9 3.64901 3.64901 2.17 E-7 3.65053 3.65053 9.14 E-7
    2 3.69652 3.69652 1.82 E-9 3.69788 3.69788 1.92 E-7 3.69938 3.69938 8.07 E-7
    5 3.74484 3.74484 1.62 E-9 3.74619 3.74619 1.70 E-7 3.74768 3.74768 7.15 E-7
    8 3.79268 3.79268 1.44 E-9 3.79401 3.79401 1.52 E-7 3.79549 3.79548 6.35 E-7

     | Show Table
    DownLoad: CSV

    Graphical depictions, whether in 2D or 3D, provide an innovative way to showcase the behavior of the model under study. These graphics allow for a direct comparison between the precise and approximate solutions and also clarify the relations between all parameters that affect the equation. In this investigation, we address the TF q-deformed TGE according to different initial conditions. Figure 1 presents the two-dimensional depiction of the solution obtained from the proposed model, incorporating starting conditions specified in Case Ⅰ. In Figure 1(a), the depiction varies at varying the fractional order parameter values B with a constant time of t=3. In Figure 1(b), the illustration remains constant at B=2 but varies across different time intervals. Figure 2 depicts the three-dimensional setup of Case Ⅰ, where Figure 2(a) elucidates the approximate solution derived in this study, while Figure 2(b) showcases the analytical solution outlined in [22]. The graphs exhibit a high degree of consistency under identical conditions, indicating the accuracy of the solutions obtained. Figures 4 and 5 represent the 2D and 3D approximate solution we obtained for the second case at convergence parameter =0.01. We choose the value of such that it is located in the interval that parallel to x-axis as presented in Figures 3 and 6. Figure 7 shows the effect of the deformation parameter q on the shape of the wave solution using initial conditions in Case Ⅰ at fixed time t=1, B=2, and =0.01. Figure 7(a) presents small values of q; in this case, decreasing q tends to dampen nonlinear effects in the equation, which can lead to smoother and more regular behavior in the solution, with less pronounced solitons and nonlinear waves. While increasing the values of q as presented in Figure 7(b) leads to stronger nonlinear effects in the equation, this can result in the amplification of soliton-like structures and nonlinear waves in the system. Figures 8 and 9 depict the solution of the TF q-deformed TGE (Case Ⅱ) under varying initial conditions specified in Eq (4.10), elucidating the influence of initial parameters on solution behavior for deformation parameter q=0.4. Figure 10 presents the solution of the TF q-deformed TGE (Case Ⅱ) at q=0.004. Figure 11 presents the solution of the TF q-deformed TGE with initial conditions specified in Eq (4.10) at fixed B=2 and =0.01 at different values of q.

    Figure 1.  The calculated solution of TF q-deformed TGE (Case Ⅰ) shown in Eq (4.5) using CPTM at P1=0.1,P2=0.0001,ν=0.01,R1=0.001,E=0.001 and ϑ=0.4 for =1. (a) At t=3 for various values of B. (b) At B=2 for several steps of time.
    Figure 2.  The three-dimensional representation of the TF q-deformed TGE (Case Ⅰ) at P1=0.1,P2=0.0001,ν=0.01,R1=0.001,E=0.001, ϑ=0.4, and B=2. (a) The estimated solution presented in Eq (4.5) at =1. (b) The exact solution.
    Figure 3.  The graphs of the -curves of the TF q-deformed TGE (Case Ⅰ) at P1=0.1,P2=0.0001,ν=0.01,R1=0.001,E=0.001, and ϑ=0.4 at ϰ=0.8 and t=0.1 at various values of B.
    Figure 4.  The calculated solution of TF q-deformed TGE (Case Ⅱ) shown in (4.9) using CPTM at P1=0.4,P2=0.01,ν=0.1,k=0.3,E=0.001, and q=0.001 for =0.01. (a) At t=4 for various values of B. (b) At B=2 for several steps of time.
    Figure 5.  The 3D representation of the solution of TF q-deformed TGE (Case Ⅱ) at P1=0.4,P2=0.01,ν=0.1,k=0.3,E=0.001, q=0.001 and B=2 for =0.01. (a) The estimated solution presented in (4.9). (b) The exact solution.
    Figure 6.  The -curves of the TF q-deformed TGE (Case Ⅱ) at P1=0.4,P2=0.01,ν=0.1,k=0.3,E=0.001, and q=0.001 at ϰ=0.8 and t=0.1 for different values of B.
    Figure 7.  The approximate solution of TF q-deformed TGE (Case Ⅱ) presented in (4.9) at P1=0.4,P2=0.01,ν=0.1,k=0.3,E=0.001,t=1, and B=2 at various q values for =0.01.
    Figure 8.  The calculated solution of TF q-deformed TGE (Case Ⅱ) presented in (4.11) at P1=0.3,P2=0.4,ν=0.001,k=0.4,E=0.1, and q=0.4 for =1. (a) At t=2 for various values of B (b) At B=2 for distinct values of t.
    Figure 9.  The 3D representation of the solution of TF q-deformed TGE (Case Ⅱ) presented in (4.11) at P1=0.3,P2=0.4,ν=0.001,k=0.4,E=0.1, q=0.4 and B=2. (a) The estimated solution when =1. (b) The exact solution.
    Figure 10.  2D and 3D representation of the solution of TF q-deformed TGE (Case Ⅱ) presented in (4.11) at P1=0.3,P2=0.4,ν=0.001,k=0.4,E=0.1, q=0.004 and B=2 for =0.01.
    Figure 11.  The calculated solution of TF q-deformed TGE (Case Ⅱ) presented in (4.11) at P1=0.3,P2=0.4,ν=0.001,k=0.4,E=0.1,t=2, and B=2 at various values of q for =0.01.

    This paper has introduced a revolutionary equation, the TF q-deformed TGE, representing a significant breakthrough in mathematical physics. This innovative equation combines fractional calculus and q-deformation, providing a flexible framework for modeling physical systems with violated symmetries. The novelty of our approach lies in solving this equation in fractional form utilizing the CPTM, known for its effectiveness in handling such equations. Our results demonstrate the efficiency and accuracy of this method, as evident from the absolute error calculations presented in the corresponding tables for each case. We have investigated both the existence and the uniqueness of the solution. Additionally, the depiction of various 2D and 3D graphs has provided insights into the impact of different parameters on the solution's behavior.

    For the future directions in exploring the TF q-deformed TGE, we aim to investigate this equation with boundary conditions and incorporate additional elements such as external source term. Furthermore, examining the stability and numerical implementation of this equation could facilitate practical applications and simulations across a range of domains.

    All authors of this article have been contributed equally. All authors have read and approved the final version of the manuscript for publication.

    The authors declare they have not used Artificial Intelligence (AI) tools in the creation of this article in any part at all.

    The authors extend their appreciation to Taif University, Saudi Arabia, for supporting this work through project number (TU-DSPP-2024-73).

    There is no conflict of interest between the authors or anyone else regarding this manuscript.

    The research was funded by Taif University, Saudi Arabia, Project number (TU-DSPP-2024-73).



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