Localized Nonlinear Waves in Nonlinear Schr¨odinger Equation with Nonlinearities Modulated in Space and Time

2011 ◽  
Vol 66 (12) ◽  
pp. 728-734 ◽  
Author(s):  
Junchao Chen ◽  
Biao Li
Keyword(s):  
Symbolic Computation ◽  
Analytical Solutions ◽  
Nonlinear Waves ◽  
Type Equation ◽  
Equation Method ◽  
One Dimensional ◽  
Space And Time ◽  
Spatial Coordinates ◽  
The One ◽  
Bose Einstein

In this paper, the generalized sub-equation method is extended to investigate localized nonlinear waves of the one-dimensional nonlinear Schrödinger equation (NLSE) with potentials and nonlinearities depending on time and on spatial coordinates. With the help of symbolic computation, three families of analytical solutions of this NLS-type equation are presented. Based on these solutions, periodically and quasiperiodically oscillating solitons (dark and bright) and moving solitons are observed. Some implications to Bose-Einstein condensates are also discussed

On Bose-Einstein condensation in one-dimensional lattices of delta functions

2020 ◽  
Vol 35 (03) ◽  
pp. 2040005 ◽  
Author(s):  
M. Bordag
Keyword(s):  
Dimensional Case ◽  
Einstein Condensation ◽  
Periodic Lattice ◽  
Spectral Functions ◽  
One Dimensional ◽  
Bose Einstein Condensation ◽  
Free Case ◽  
Delta Functions ◽  
The One ◽  
Bose Einstein

We investigate Bose-Einstein condensation of a gas of non-interacting Bose particles moving in the background of a periodic lattice of delta functions. In the one-dimensional case, where one has no condensation in the free case, we showed that this property persist also in the presence of the lattice. In addition we formulated some conditions on the spectral functions which would allow for condensation.

scholarly journals EXACT SOLUTIONS TO THE SPIN-2 GROSS–PITAEVSKII EQUATIONS

2012 ◽  
Vol 27 (02) ◽  
pp. 1350013 ◽  
Author(s):  
ZHI-HAI ZHANG ◽  
YONG-KAI LIU ◽  
SHI-JIE YANG
Keyword(s):  
Exact Solutions ◽  
Rotational Symmetry ◽  
Time Factors ◽  
Time Dependent ◽  
Spin Space ◽  
One Dimensional ◽  
Density Distributions ◽  
Hyperfine State ◽  
The One ◽  
Bose Einstein

We present several exact solutions to the coupled nonlinear Gross–Pitaevskii equations which describe the motion of the one-dimensional spin-2 Bose–Einstein condensates. The nonlinear density–density interactions are decoupled by making use of the properties of Jacobian elliptical functions. The distinct time factors in each hyperfine state implies a "Lamor" procession in these solutions. Furthermore, exact time-evolving solutions to the time-dependent Gross–Pitaevskii equations are constructed through the spin-rotational symmetry of the Hamiltonian. The spin-polarizations and density distributions in the spin-space are analyzed.

scholarly journals Study of Attractive Nonlinearity by 1-D Nonlinear Schrödinger Equation in the Bose–Einstein Condensate

1970 ◽  
Vol 33 (1) ◽  
pp. 87-98
Author(s):  
ML Rahman ◽  
Y Haque ◽  
SK Das ◽  
MM Hossain ◽  
MH Rashid
Keyword(s):  
Boundary Condition ◽  
Small Perturbation ◽  
Stationary Solutions ◽  
Einstein Condensate ◽  
One Dimensional ◽  
Bright Solitons ◽  
Non Linear ◽  
The One ◽  
Bose Einstein ◽  
Academy Of Sciences

The work represents and investigates the stationary solutions of the one-dimensional Non-linear Schrödinger Equation (NLSE), for attractive non-linearity, in the Bose-Einstein condensates (BEC) under the box boundary condition and calculates the characteristics of internal modes of bright solitons (eigen modes of small perturbation of the condensate). DOI: 10.3329/jbas.v33i1.2953 Journal of Bangladesh Academy of Sciences, Vol. 33, No. 1, 87-98, 2009

scholarly journals A Convergent Three-Step Numerical Method to Solve a Double-Fractional Two-Component Bose–Einstein Condensate

Mathematics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1412
Author(s):  
Adán J. Serna-Reyes ◽  
Jorge E. Macías-Díaz ◽  
Nuria Reguera
Keyword(s):  
Fractional Derivatives ◽  
Numerical Solutions ◽  
Einstein Condensate ◽  
One Dimensional ◽  
Bose Einstein Condensate ◽  
Nonlinear Parabolic ◽  
Complex Functions ◽  
Two Component ◽  
The One ◽  
Bose Einstein

This manuscript introduces a discrete technique to estimate the solution of a double-fractional two-component Bose–Einstein condensate. The system consists of two coupled nonlinear parabolic partial differential equations whose solutions are two complex functions, and the spatial fractional derivatives are interpreted in the Riesz sense. Initial and homogeneous Dirichlet boundary data are imposed on a multidimensional spatial domain. To approximate the solutions, we employ a finite difference methodology. We rigorously establish the existence of numerical solutions along with the main numerical properties. Concretely, we show that the scheme is consistent in both space and time as well as stable and convergent. Numerical simulations in the one-dimensional scenario are presented in order to show the performance of the scheme. For the sake of convenience, A MATLAB code of the numerical model is provided in the appendix at the end of this work.

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