Abstract
Lump and their interactions with kink, periodic and rogue waves, and periodic cross lump waves will be studied for fifth-order variable coefficient nonlinear-Schrödinger equation in this paper. With the combinations of bilinear, exponent, and trigonometric functions, we’ll study different lump soliton solutions. With interaction phenomenon we’ll set up some new analytical solutions and also represents them in graphical ways.
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1 Introduction
Partial differential equations (PDE) show their effectivness to overcome various issues appearing in the fields of mathematical and physical sciences. Due to the roots in different fields of sciences, the ideology of PDEs, both linear and nonlinear, is one of the highest and more active fields of modern mathematics (Melike and Mehmet 2018; Hosseini et al. 2017; Raza 2021; Bhatti and Lu 2019). Nonlinear PDEs (NLPDE) have a giant influence on nonlinear mathematical forms in engineering, physics, biology, fluid mechanics, condensed matter physics, nonlinear optics (Khater et al. 2000; Ali et al. 2020; Sağlam Özkan et al. 2021; Seadawy and Cheemaa 2019; Younas et al. 2020; Rizvi et al. 2020; Helal and Seadawy 2009), etc. Higher-order NLSEs are the main segments for NLPDEs. There is plenty of well-known NLSEs, like derivative NLSE (Younas et al. 2020), cubic-quartic NLSE (Gao et al. 2019), Kundu Mukherjee Naskar model (He 2020), Gross Pitaevskii equation (Feng et al. 2021), Fokas-Lenells equation (Ahmed et al. 2019), and many other. A large number of integration techniques have been introduced to get particular solutions for NLSEs; like improved F-expansion method (Gao and Wang 2020), \(exp((\frac{-\Psi '}{\Psi }) \eta )\)-expansion scheme (Seadawy 2019), extended direct algebraic technique (Ahmed et al. 2019), new extended-auxiliary equation architectonic (seadawy et al. 2018), generalized Kudryashov mechanism (Gaber et al. 2019), extended auxiliary equation approach (Akram et al. 2021), \(\tan (\Phi (\rho )/2)\)-expansion technique (Raza et al. 2020), \(\Phi ^6\)-model expansion approach (Seadawy et al. 2021), etc.
Analytic solutions of some well-known NLSEs have been investigated in (Li et al. 2015; Seadawy 2015; Arshad et al. 2017; Ahmed et al. 2019; Chen et al. 2020). In optical fibers, the propagation of solitons may be appropriately specified by variable coefficient NLSEs (VCNLSE) (Malomed 2006). To raise the transmission rate ultrashort pulses (picosecond or less) are usually used as data bearers, for which higher-order dispersion can’t be neglected. Therefore, it’s important to explore the analytical fams of soliton solutions of NLPDEs that include higher-order specifications, particularly to find the proper solutions of higher-order VCNLSEs, from a logical and scientific point of view. Here we contemplate FVCNLSE as given by (Yang et al. 2018),
which can be used as an integrable pattern to characterize the proliferation of ultrashort pulses in inharmonious optical fibers. Here \(p = p(x,t)\) is a complex function, x is the formalized transmission distance, t is the delayed time, and asterisk stands for the complex conjugate. Physically, the parameters A(x), B(x), C(x) and D(x) represents the group velocity, third-order, fourth-order, and fifth-order dispersion respectively. This model with constant quantities has been verified to be entirely integrable by using the Lax pair and Darboux transmutations (Chowdury et al. 2014). However, x-dependent coefficients A(x), B(x), C(x), and D(x) have not been studied there. An exhaustive study of integrability setting for the x-dependent parameters of VCNLSE needs to be a subject of independent work. Now we’ll study the above model for lump and their interactions with kink, periodic and rogue waves (Yang et al. 2018; Rizvi et al. 2020; Zhou et al. 2019; Kofane et al. 2017; Liu 2018; Seadawy et al. 2021; Ma and Li 2020; Ma et al. 2020). Lump solitons are analytically localized in all directions. The implementations of lump waves are greatly comprehensive, like distant ghost waves that emerge and dissolve unpredictably and uncertainly, notably, COVID-19. Rogue waves with heights exceed about 18 meters are powerful nonlinear waves that have the ability to produced huge damages even for massive ships. They are sizably much bigger as compared to the normal sea waves. There is no conformity for how and when they appear, the maximum height of the rogue wave recorded 25 meters (Olagnon 2017; Korpinar et al. 2020; Ali et al. 2020).
Now to investigate the above model, we’ll use the complex substitution \(p = r + i s\), which transforms Eq. (1) into the following real and Img parts,
Now we use this system in the next sections to find out new analytical solutions for our concern model. We present distinct possible choices of solitons and interaction solutions, by adjusting the real parameters of the concerning model, based on the gained results. Particularly, we will establish a probability to have pulse thickness of two merging solitons growing after a collision, without a variation in their sizes. The paper is arranges in proceeding pattern: in sec. 2, we study lump solutions, in sec. 3, we present lump interaction with two kink waves, in sec. 4, we obtain lump solution with periodic waves, in sec. 5, we study rogue wave solutions, in sec. 6, we presents results periodic cross lump waves solutions, in sec. 7, we discuss our obtained results and at the end, in sec. 8, we give concluding remarks.
2 Lump solutions
To attain lump solutions we use the following log forms,
Eq. (3) transforms Eq. (2) into the following bilinear forms,
Now u and v in the bilinear form can be assumed as, (Helal and Seadawy 2009),
where \(\chi _{1}=b_{1} x+ b_{2} t,\) and \(\chi _{2}=b_{3} x+ b_{4} t\). However, \(b_i\)’s, \(g_0\) and \(h_0\) are real -valued constants. Now, inserting u and v into Eq. (4) and collecting all powers of x and t, which implies us the following nonzero parameters:
Set I:
Using these parameters into Eq. (5) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (6). Now, r and s gives the required solution for Eq. (1),
Here \(\Delta = 29435 A(x) C(x)^2 t^2 - 15428 A(x)^2 B(x) C(x) t x + 1980 A(x)^3 D(x) t x,\) \(\Delta _1 = \frac{1538336175 (4504 + 273 \sqrt{273}) b_3^2 C(x)^5}{209 A(x)^3 (3857 B(x) C(x) -495 D(x) A(x))^2},\) and \(\Omega = \frac{4205 \sqrt{\frac{1}{209}(-8+\sqrt{273})} (16+\sqrt{273}) b_3 C(x)^2 t}{2 A(x) (495 A(x) D(x) - 3857 B(x) C(x))} + \frac{\sqrt{-8 +\sqrt{273} b_3} x}{\sqrt{209}}\).
Set II:
Using these parameters into Eq. (5) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (9). Now, r and s gives the required solution for Eq. (1),
3 Lump interaction with kink-waves
To attain kink interaction solutions we use the following forms,
where \(\chi _{1}=b_{1} x+ b_{2} t,\) \(\chi _{2}=b_{3} x+ b_{4} t,\) \(\varrho _1=a_1 x +a_2 t\) and \(\varrho _2=a_3 x +a_4 t\) However, \(b_i\)s, \(a_i\)s, \(g_0\) and \(h_0\) are real -valued constants. Now, inserting u and v into Eq. (4) and collecting all powers of x, t, \(e^{a_1 x +a_2 t}\) and \(e^{a_3 x +a_4 t}\), which implies us the following nonzero parameters:
Set I:
and
Using these parameters into Eq. (12) and then by using Eq. (3), we get:
Now, r and s gives the required solution for Eq. (1),
where \(\Lambda = \frac{2 b_4^2 (67 A(x) - 12 a_4 (12 B(x) + 5 a_4 (-71 C(x) + 100 a_4 D(x)))) t}{9 A(x) + 4 a_4 (18 B(x) + 5 a_4 (39 C(x) + 20 a_4 D(x)))}\).
Set II:
Using these parameters into Eq. (12) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (16). Now, r and s gives the required solution for Eq. (1),
4 Lump interaction with periodic-wave
To attain kink interaction solutions we use the following forms,
where \(\chi _{1}=b_{1} x+ b_{2} t,\) \(\chi _{2}=b_{3} x+ b_{4} t,\) \(\varrho _1=a_1 x +a_2 t\) and \(\varrho _2=a_3 x +a_4 t\). However, \(b_i\)’s, \(a_i\)’s, \(g_0\) and \(h_0\) are real -valued constants. Now, inserting u and v into Eq. (4) and collecting all powers of x, t, \(\cos (a_1 x +a_2 t)\), \(\sin (a_1 x +a_2 t)\), \(\cos (a_3 x +a_4 t)\) and \(\sin (a_3 x +a_4 t)\), which implies us the following nonzero parameters:
Set I:
Using these parameters into Eq. (19) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (20). Now, r and s gives the required solution for Eq. (1),
Set II:
Using these parameters into Eq. (19) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (23). Now, r and s gives the required periodic waves solution for Eq. (1),
where \(\Omega = \frac{1}{4} \sqrt{\frac{21}{110}} \sqrt{-\frac{B(x)}{D(x)}} t + \frac{\sqrt{\frac{7}{330}} \left( -\frac{B(x)}{D(x)}\right) ^{3/2} \left( 33327 B(x)^2 C(x)^2 + 7392 A(x) B(x) C(x) D(x) - 77440 A(x)^2 D(x)^2 \right) x}{154880 B(x) C(x)^2}.\)
5 Rogue-wave solutions
For this, we can use u and v as following,
where \(\chi _{1}=b_{1} x+ b_{2} t,\) \(\chi _{2}=b_{3} x+ b_{4} t,\) \(\varrho _1=a_1 x +a_2 t\) and \(\varrho _2=a_3 x +a_4 t\). However, \(b_i\)’s, \(a_i\)’s, \(g_0\) and \(h_0\) are real -valued constants. Now, inserting u and v into Eq. (4) and collecting all powers of x, t, \(\cosh (a_1 x +a_2 t)\), \(\sinh (a_1 x +a_2 t)\), \(\cosh (a_3 x +a_4 t)\), \(\sinh (a_3 x +a_4 t)\), \(\cosh (a_3 x +a_4 t) \sinh (a_3 x +a_4 t)\) and \(\cosh (a_1 x +a_2 t) \sinh (a_3 x +a_4 t)\), which implies us the following nonzero parameters:
Set I:
Using these parameters into Eq. (26) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (27). Now, r and s gives the required solution for Eq. (1),
Set II:
Using these parameters into Eq. (26) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (30). Now, r and s gives the required solution for Eq. (1),
6 Periodic-cross lump waves solution
For interaction of lump with periodic and rogue waves, we can use u and v as following,
where \(\chi _{1}=b_{1} x+ b_{2} t,\) \(\chi _{2}=b_{3} x+ b_{4} t,\) \(\varrho _1=a_1 x +a_2 t\) and \(\varrho _2=a_3 x +a_4 t\). However, \(b_i\)’s, \(a_i\)’s, \(g_0\), \(h_0\) and \(z_i\)’s are real -valued constants. Now, inserting u and v into Eq. (4) and collecting all powers of x, t, \(\cos (a_1 x +a_2 t)\), \(\sin (a_1 x +a_2 t)\), \(\cosh (a_3 x +a_4 t)\), \(\sinh (a_3 x +a_4 t)\), \(\cos (a_1 x +a_2 t) \cosh (a_3 x +a_4 t)\) and \(\sin (a_1 x +a_2 t) \sinh (a_3 x +a_4 t)\), which implies us the following nonzero parameters:
Set I:
Using these parameters into Eq. (33) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (34). Now, r and s gives the required solution for Eq. (1),
Set II:
Using these parameters into Eq. (33) and then by using Eq. (3), we get:
The values of the parameters are mentioned in Eq. (37). Now, r and s give us the required solution,
where \(\Delta = 3 \sqrt{\frac{110}{5233}} \sqrt{\frac{A(x)}{C(x)}} t + a_3 x\), and \(\Omega = 3 \sqrt{\frac{2}{53}} \sqrt{\frac{A(x)}{C(x)}} t + a_3 x.\)
7 Result and discussions
Here, we’ll discuss some already published work on FVCNLSE and our newly gained results. The FVCNLSE has been investigated by various researchers, like: Lan investigated soliton and breather solutions based on Darboux transformations for FVCNLSE (Lan 2020). Zhao et al. obtained dark one, two and three -soliton solutions for FVCNLSE (Zhao et al. 2016). Huang et al. studied soliton stability, dark solitons and interactions with dark two solitons for FVCNLSE (Huang et al. 2019). Liu et al. studied multi-soliton, and interactions of one, two and three solitons for FVCNLSE (Liu et al. 2020). Huang investigated integrability and dark solutions for FVCNLSE (Huang 2019).
In this work, we investigated lump solutions, lump with kink, periodic waves, rogue-waves, and periodic cross lump waves for FVCNLSE with the aid of some new ansatz forms. All new results have been shown in graphical ways by assigning real values to the parameters. Figures 1, 2, 3, 4 represents lump solutions for \(p_1\), \(p_2\), \(p_3\) and \(p_4\) respectively. Figures 5, 6, 7, 8 represents lump with kink solutions for \(p_5\), \(p_6\), \(p_7\) and \(p_8\) respectively. In Figures 9,10, 11, 12 we successfully obtained periodic wave solutions with lump solitons for \(p_9\), \(p_{10}\), \(p_{11}\) and \(p_{12}\). Figures (13, 14, 15, 16) shows the rogue waves solutions for \(p_{13}\), \(p_{14}\), \(p_{15}\) and \(p_{16}\) respectively. We can see in \(p_{13}\) when \(h_0 \rightarrow \infty\) then \(p_{13} \rightarrow 0\), and similarly in \(p_{14}\) & \(p_{15}\) when \(g_0 + h_0 \rightarrow \infty\) then \(p_{14} ~ \& ~ p_{15} \rightarrow 0\). Figure (17, 18) represents the evaluation of lump, periodic and rogue waves for \(p_{17}\) and \(p_{20}\) respectively. From solutions \(p_{17}\) to \(p_{20}\) we can see that A(x) and C(x) both are not be equal to zero, when they are zero then our solutions will be undefined.
8 Concluding remarks
In this article, we studied FVCNLSE and obtained various lump and interaction solutions with the aid of some new ansatz transformations. For this model we successfully achieved twenty new proper solutions and also show them in 3D, 2D and contour shapes. These new forms are effective and powerful in solving more nonlinear models.
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Taif University Researchers Supporting Project number (TURSP-2020/320), Taif University, Taif, Saudi Arabia.
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Rizvi, S.T.R., Seadawy, A.R., Ali, K. et al. Multiple lump and interaction solutions for fifth-order variable coefficient nonlinear-Schrödinger dynamical equation. Opt Quant Electron 54, 154 (2022). https://doi.org/10.1007/s11082-022-03532-y
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DOI: https://doi.org/10.1007/s11082-022-03532-y