Some Analytical Solitary Wave Solutions for the Generalized q-Deformed Sinh-Gordon Equation:
We introduce the generalized q-deformed Sinh-Gordon equation and derive analytical soliton solutions for some sets of parameters. This new defined equation could be useful for modeling physical systems with violated symmetries.
Dynamical models are the cornerstone of several fields of science and uneven covered in the literature [1–9]. They represent an important research area in mathematics and theoretical physics. Such models are usually based on nonlinear ordinary or partial differential equations. Nonlinearity has generated crucial effects and phenomena not only in the macroscopical systems but also in the microscopical systems governed by quantum physics. We can cite as examples Rogue waves [10–12], bifurcation [13, 14], bistability [15–18], chaos [19–22], phase transition [23–26], lasing [27–31], superradiance [32–34], correlations [35–37], squeezing [38–41], and solitons [42–48]. A particular interest is focused on solitons due to their potential new application perspectives in several fields of physics and engineering [49–56]. Soliton is a propagating wave solution that conserves its shape and has a particle-like behavior. This propriety could be explained in general by a balance between dispersion and nonlinearity. Several famous nonlinear partial differential equations generate solitons [43, 57–61] such as Korteweg-de Vries equation, nonlinear Schrödinger equation, Kadomtsev-Petviashvili equation, Sin-Gordon, and Sinh-Gordon equations. The Sinh-Gordon equation has several applications such as in surface theory , crystal lattice formation , and string dynamics in curved space-time . When the q-deformed hyperbolic function, proposed in the ninetieth of the last century by Arai [65, 66], is included in the dynamical system, the symmetry of the system is destroyed and consequently the symmetry of the solution. Recently, several solutions for Schrödinger equation and Dirac equation with q-deformed hyperbolic potential are generated [67–72]. q-deformed functions are very promising for modeling atom-trapping potentials or statistical distributions in Bose-Einstein condensates [73, 74] as well as for exploring vibrational spectra of diatomic molecules [75, 76].
In this work, we propose to analyze the propagating wave solutions for a more general form of the Sinh-Gordon equation, the generalized q-deformed Sinh-Gordon equation. As far as we know, this equation is introduced for the first time. We derive for some sets of parameters analytical soliton solutions. The generalized q-deformed Sinh-Gordon equation will open the door for conceiving models of physical systems where the symmetry is absent or violated.
Let us first define the generalized q-deformed Sinh-Gordon equation aswhere , , and For , (1) admits a trivial constant solutionIt is useful to mention that any first-order polynome (; with ) in or in or any combination of two arbitrary first-order polynomes ( ) can not be a solution to the generalized q-deformed Sinh-Gordon equation (1). Equation (1) is also equivalent towhere and is the Arai q-deformed function defined byand we have alsowhere For we get the standard , , , and functions. We list below some simple and useful relations for q-deformed functionswhere and are, respectively, the inverse functions of and . Since and vanish at thenIt is worth mentioning that the generalized q-deformed Sinh-Gordon equation (1) with can be easily transformed to the generalized q-deformed Sin-Gordon equation defined asby changing and .
Let us return to (1), by defining the following new normalized coordinates:and using(1) becomesHere is defined by the sign of and . Using the standard transformationandwith is an arbitrary constant, we obtain thenThis equation is obtained for positive , and for negative we obtain the same equation as (27) by interchanging and . Equation (27) has two conservative quantities, namely, the total energy and the momentum [77, 78] defined byandwhere
3. Traveling Wave Solution
In this section we explore the traveling wave solutions of the generalized q-deformed Sinh-Gordon equation (27). We first define a new moving coordinateso can be interpreted as the speed of the traveling wave in the space-time . Note that by defining we get the trivial constant solution for Here we take ; the traveling wave in the moving frame verifiesIt is worth mentioning that, for , , , and , (27) describes the standard traveling wave of Sinh-Gordon equation. Let us consider now the following particular cases.
3.1. Special Case (1): The Deformed Sinh-Gordon Equation (, , and )
For , , and (in this case (27) can be identified as a deformed Sinh-Gordon equation). We can multiply both side of (34) by and after the integration we getso we have an implicit equation for the traveling wavewhich can be written also aswhere and are free parameters. We can derive general explicit solutions for the considered q-deformed Sinh-Gordon equation. In factand let us first remind the definition of the Weierstrass Elliptic function so we need to transform the expression of and in particular the polynomial . By defining the polynomial will be transformed to , where and , and we have thenFinally, we obtain the general expression of the soliton in the moving frame with and are free parameters. Let us now study another case.
3.2. Special Case (2): (, , and )
In this section we shall derive analytical soliton solutions for the caseAfter multiplication of (45) by and integration, we havewhere is a free parameter.
Equation (46) can be integrated and we obtain then the following general implicit solutions:It is worth mentioning that this equation is valid only for and .
By choosing or we can generate from direct integration of (46) two other sets of implicit solutions, namely,and
3.3. Special Case (3): (, , and )
Another interesting case to study is for (, , and , the traveling wave equation is thenLet us first mention that is not a solution for (50). By using the transformationwe getIn order to solve this nonlinear second-order equation we definesoand (52) will be transformed toThis is a first-order inhomogeneous linear differential equation with the general solutionHere is an arbitrary constant. From definition (53) and (56) the expression of the soliton in the implicit form is thenwhere and are free parameters. We can writewhereThe expression of the solution for (52) is thenand consequently the general expression of the soliton in the moving frame iswhere and are free parameters.
We have introduced a generalized q-deformed Sinh-Gordon equation defined by (1) (). We have derived general explicit analytical soliton solutions for two sets of parameters, namely, (, , and ) and (, , and ). Furthermore, we have given general implicit soliton solutions for the case: , , and . Future investigations will be focusing on generating more soliton solutions using algebraic methods such as Tanh-method , rational expansion method , expansion method , and auxiliary method . The general study of the traveling wave solutions for the generalized q-deformed Sinh-Gordon equation or its asymptotic behavior as well as the analysis of some other proprieties will be for sure very interesting. The usefulness of the generalized q-deformed Sinh-Gordon equation will not be limited to the fields of applied mathematics and mathematical physics but also will open the door for applications in physics where the symmetry of the studied system is absent or violated.
No data were used to support this study.
Conflicts of Interest
The author declares that they have no conflicts of interest.
S. H. Strogatz, Nonlinear Dynamics and Chaos: With Applications to Physics, Biology, Chemistry, and Engineering, Westview Press, Boulder, Colorado, 2015.
J. Wang, “Landscape and flux theory of non-equilibrium dynamical systems with application to biology,” Advances in Physics, vol. 64, no. 1, pp. 1–137, 2015.View at: Google Scholar
V. Jaksic, D. P. Mandic, K. Ryan, B. Basu, V. Pakrashi, and R. Soc, “A comprehensive study of the delay vector variance method for quantification of nonlinearity in dynamical systems,” Royal Society Open Science, vol. 3, Article ID 150493, 2016.View at: Google Scholar
M. Savescu, K. R. Khan, R. W. Kohl, L. Moraru, A. Yildirim, and A. Biswas, “Optical soliton perturbation with improved nonlinear Schrödinger’s equation in nano fibers,” Journal of Nanoelectronics and Optoelectronics, vol. 8, pp. 208–220, 2013.View at: Google Scholar
B. Geranmehr and S. R. Nekoo, “Nonlinear suboptimal control of fully coupled non-affine six-DOF autonomous underwater vehicle using the state-dependent Riccati equation,” Ocean Engineering, vol. 96, pp. 248–257, 2015.View at: Google Scholar
Z. Du, B. Tian, H.-P. Chai, Y. Sun, and X.-H. Zhao, “Rogue waves for the coupled variable-coefficient fourth-order nonlinear Schrödinger equations in an inhomogeneous optical fiber,” Chaos, Solitons & Fractals, vol. 10, pp. 90–98, 2018.View at: Google Scholar
L. Liu, B. Tian, Y.-Q. Yuan, and Z. Du, “Dark-bright solitons and semirational rogue waves for the coupled Sasa-Satsuma equations,” Physical Review E, Covering Statistical, Nonlinear, Biological, and Soft Matter Physics, vol. 97, Article ID 052217, 2018.View at: Google Scholar
X.-Y. Wu, B. Tian, L. Liu, and Y. Sun, “Rogue waves for a variable-coefficient Kadomtsev–Petviashvili equation in fluid mechanics,” Computers & Mathematics with Applications, vol. 76, no. 2, pp. 215–223, 2018.View at: Google Scholar
Y. A. Kuznetsov, Elements of Applied Bifurcation Theory, vol. 112 of Applied Mathematics Science, Springer, New York, NY, USA, 2nd edition, 1998.View at: MathSciNet
B. Zhilinski, “Quantum bifurcations,” in Encyclopedia of Complexity and Systems Science, p. 7135, Springer-Verlag, Berlin, Germany, 2009.View at: Google Scholar
E. A. Sete, H. Eleuch, and S. Das, “Controllable nonlinear effects in an optomechanical resonator containing a quantum well,” Physical Review A: Atomic, Molecular and Optical Physics, vol. 85, no. 4, Article ID 043824, 2012.View at: Google Scholar
H. Eleuch and A. Prasad, “Chaos and regularity in semiconductor microcavities,” Physics Letters A, vol. 376, no. 26-27, pp. 1970–1977, 2012.View at: Google Scholar
V. G. Ivancevic and T. T. Ivancevic, Complex Nonlinearity: Chaos, Phase Transitions, Topology Change and Path Integrals, Springer, New York, NY, USA, 2008.View at: MathSciNet
D. G. Joshi and M. Vojta, “Nonlinear bond-operator theory and 1/d expansion for coupled-dimer magnets. II. Antiferromagnetic phase and quantum phase transition,” Physical Review B: Condensed Matter and Materials Physics, vol. 91, no. 9, Article ID 094405, 2015.View at: Google Scholar
R. Buschlinger, M. Lorke, and U. Peschel, “Light-matter interaction and lasing in semiconductor nanowires: A combined finite-difference time-domain and semiconductor Bloch equation approach,” Physical Review B: Condensed Matter and Materials Physics, vol. 91, no. 4, Article ID 045203, 2015.View at: Publisher Site | Google Scholar
R. Buschlinger, M. Lorke, and U. Peschel, “Erratum: Light-matter interaction and lasing in semiconductor nanowires: A combined finite-difference time-domain and semiconductor Bloch equation approach [Phys. Rev. B 91, 045203 (2015)],” Physical Review B: Condensed Matter and Materials Physics, vol. 91, no. 15, Article ID 159903, 2015.View at: Publisher Site | Google Scholar
M. Eghbalpour, R. Karimi, S. Batebi, and H. R. Soleimani, “Effect of electron-spin relaxation on optical bistability and lasing without population inversion in a three-level v type quantum system,” Optik - International Journal for Light and Electron Optics, vol. 127, no. 5, pp. 2525–2530, 2016.View at: Publisher Site | Google Scholar
E. A. Sete, A. A. Svidzinsky, Y. V. Rostovtsev et al., “Using quantum coherence to generate gain in the XUV and X-ray: gain-swept superradiance and lasing without inversion,” IEEE Journal of Selected Topics in Quantum Electronics, vol. 18, no. 1, pp. 541–553, 2012.View at: Google Scholar
M. Gross and S. Haroche, “Superradiance: An essay on the theory of collective spontaneous emission,” Physics Reports, vol. 93, no. 5, pp. 301–396, 1982.View at: Google Scholar
K. Kasai, G. Jiangrui, and C. Fabre, “Observation of squeezing using cascaded nonlinearity,” EPL (Europhysics Letters), vol. 40, no. 1, article 25, 1997.View at: Google Scholar
P. D. Drummond, Quantum Squeezing, Springer Series on Atomic, Optical, and Plasma Physics, Springer, New York, NY, USA, 2010.
X.-H. Zhao, B. Tian, J. Chai, X.-Y. Wu, and Y.-J. Guo, “Multi-soliton interaction of a generalized Schrödinger-Boussinesq system in a magnetized plasma,” The European Physical Journal Plus, vol. 132, article 192, 2017.View at: Google Scholar
A. Biswas, D. Milovic, and A. Ranasinghe, “Solitary waves of Boussinesq equation in a power law media,” Communications in Nonlinear Science and Numerical Simulation, vol. 14, no. 11, pp. 3738–3742, 2009.View at: Google Scholar
G. Ebadi, A. H. Kara, M. D. Petkovic, A. Yildirim, and A. Biswas, “Solitons and conserved quantities of the Ito equation,” Proceedings of the Romanian Academy - Series A: Mathematics, Physics, Technical Sciences, Information Science, vol. 13, no. 3, pp. 215–224, 2012.View at: Google Scholar
Y. S. Kivshara and B. Luther-Davies, “Dark optical solitons: physics and applications,” Physics Reports, vol. 298, no. 2-3, pp. 81–197, 1998.View at: Google Scholar
R. Hao, “Optical soliton control in inhomogeneous nonlinear media with the parity-time symmetric potentials,” Optics Communications, vol. 338, pp. 265–268, 2015.View at: Google Scholar
A. Biswas, “Dispersion-managed solitons in optical fibres,” Journal of Optics A: Pure and Applied Optics, vol. 4, no. 1, article 84, 2002.View at: Google Scholar
J. V. Guzman, E. M. Hilal, A. A. Alshaery et al., “Thirring optical solitons with spatio-temporal dispersion,” Proceedings of The Romanian Academy, Series A, vol. 16, no. 1, pp. 41–46, 2015.View at: Google Scholar
A. H. Bhrawy, M. A. Abdelkawy, and A. Biswas, “Cnoidal and snoidal wave solutions to coupled nonlinear wave equations by the extended Jacobi's elliptic function method,” Communications in Nonlinear Science and Numerical Simulation, vol. 18, no. 4, pp. 915–925, 2013.View at: Publisher Site | Google Scholar | MathSciNet
G. Ebadi, N. Y. Fard, A. H. Bhrawy et al., “Solitons and other solutions to the (3+1)-dimensional extended Kadomtsev-Petviashviliequation with power law nonlinearity,” Romanian Reports in Physics, vol. 65, no. 1, pp. 27–62, 2013.View at: Google Scholar
A. Biswas, A. H. Bhrawy, M. A. Abdelkawy, A. A. Alshaery, and E. M. Hilal, “Symbolic computation of some nonlinear fractional differential equations,” Romanian Reports in Physics, vol. 59, no. 5-6, pp. 433–442, 2014.View at: Google Scholar
A. Sardar, K. Ali, S. Tahir et al., “Dispersive optical solitons in nanofibers with Schrödinger-Hirota equation,” Journal of Nanoelectronics and Optoelectronics, vol. 11, no. 3, pp. 382–387, 2016.View at: Google Scholar
Q. J. Zeng, Z. Cheng, and J. H. Yuan, “Bose–Einstein condensation of a q-deformed boson system in a harmonic potential trap,” Physica A: Statistical Mechanics and its Applications, vol. 3, pp. 563–571, 391.View at: Google Scholar
S. M. Ikhdair, “Rotation and vibration of diatomic molecule in the spatially-dependent mass Schrödinger equation with generalized q-deformed Morse potential,” Chemical Physics, vol. 361, no. 1-2, pp. 9–17, 2009.View at: Google Scholar
J. L. Zhang, M. L. Wang, Y. M. Wang, and Z. D. Fang, “The improved F-expansion method and its applications,” Physics Letters A, vol. 350, no. 1-2, pp. 103–109, 2006.View at: Google Scholar