11,931 research outputs found
Mixed soliton solutions of the defocusing nonlocal nonlinear Schrodinger equation
By using the Darboux transformation, we obtain two new types of
exponential-and-rational mixed soliton solutions for the defocusing nonlocal
nonlinear Schrodinger equation. We reveal that the first type of solution can
display a large variety of interactions among two exponential solitons and two
rational solitons, in which the standard elastic interaction properties are
preserved and each soliton could be either the dark or antidark type. By
developing the asymptotic analysis technique, we also find that the second type
of solution can exhibit the elastic interactions among four mixed asymptotic
solitons. But in sharp contrast to the common solitons, the asymptotic mixed
solitons have the t-dependent velocities and their phase shifts before and
after interaction also grow with |t| in the logarithmical manner. In addition,
we discuss the degenerate cases for such two types of mixed soliton solutions
when the four-soliton interaction reduces to a three-soliton or two-soliton
interaction.Comment: 28 pages, 7 figure
Statistically induced topological phase transitions in a one-dimensional superlattice anyon-Hubbard model
We theoretically investigate topological properties of the one-dimensional
superlattice anyon-Hubbard model, which can be mapped to a superlattice
bose-Hubbard model with an occupation-dependent phase factor by fractional
Jordan-Wigner transformation. The topological anyon-Mott insulator is
identified by topological invariant and edge modes using exact diagonalization
and density-matrix renormalization-group algorithm. When only the statistical
angle is varied and all other parameters are fixed, a statistically induced
topological phase transition can be realized, which provides new insights into
the topological phase transitions. What's more, we give an explanation of the
statistically induced topological phase transition. The topological anyon-Mott
phases can also appear in a variety of superlattice anyon-Hubbard models.Comment: 7 pages, 8 figures, comments are welcom
Stochastic collocation methods via minimization of Transformed penalty
We study the properties of sparse reconstruction of transformed
(TL1) minimization and present improved theoretical results about the
recoverability and the accuracy of this reconstruction from undersampled
measurements. We then combine this method with the stochastic collocation
approach to identify the coefficients of sparse orthogonal polynomial
expansions for uncertainty quantification. In order to implement the TL1
minimization, we use the DCA-TL1 algorithm which was introduced by Zhang and
Xin. In particular, when recover non-sparse functions, we adopt an adaptive
DCA-TL1 method to guarantee the sparest solutions. Various numerical examples,
including sparse polynomial functions recovery and non-sparse analytical
functions recovery are presented to demonstrate the recoverability and
efficiency of this novel method and its potential for problems of practical
interests.Comment: 18 pages, 8 figure
The applications of the general and reduced Yangian algebras
The applications of the general and reduced Yangian Y(sl(2)) and Y(su(3))
algebras are discussed. By taking a special constraint, the representation of
Y(sl(2)) and Y(su(3)) can be divided into two 2 \times 2 and three 3 \times 3
blocks diagonal respectively. The general and reduced Yangian Y(sl(2)) and
Y(su(3)) are applied to the bi-qubit system and the mixed light pseudoscalar
meson state, respectively. We can find that the general ones are not able to
make the initial states disentangled by acting on the initial states, however
the reduced ones are able to make the initial state disentangled. In addition,
we show the effects of Y(su(3)) generators on the the decay channel
High-order Rogue Waves in Vector Nonlinear Schr\"odinger Equations
We study on dynamics of high-order rogue wave in two-component coupled
nonlinear Schr\"{o}dinger equations. We find four fundamental rogue waves can
emerge for second-order vector RW in the coupled system, in contrast to the
high-order ones in single component systems. The distribution shape can be
quadrilateral, triangle, and line structures through varying the proper initial
excitations given by the exact analytical solutions. Moreover, six fundamental
rogue wave can emerge on the distribution for second-order vector rogue wave,
which is similar to the scalar third-order ones. The distribution patten for
vector ones are much abundant than the ones for scalar rogue waves. The results
could be of interest in such diverse fields as Bose-Einstein condensates,
nonlinear fibers, and superfluids.Comment: 5 pages, 4 figure
Darboux transformation and multi-dark soliton for N-component coupled nonlinear Schr\"odinger equations
In this paper, we obtain a uniform Darboux transformation for multi-component
coupled NLS equations, which can be reduced to all previous presented Darboux
transformation. As a direct application, we derive the single dark soliton and
multi-dark soliton solutions for multi-component coupled NLS with defocusing
case and mixed focusing and defocusing case. Some exact single and two-dark
solitons of three-component NLS equation are shown by plotting the picture.Comment: 14 pages, 4 figure
Reply to "Comment on "Darboux transformation and classification of solution for mixed coupled nonlinear Schr\"odinger equations""
In the recent comment quoted in the title (arXiv:1407.7852v1), a comment is
presented on our recent work which derive a generalized nonlinear wave solution
formula for mixed coupled nonlinear Sch\"{o}dinger equations by performing the
unified Darboux transformation (arXiv:1407.5194). Here we would like to reply
to the comment and clarify some facts in arXiv:1407.5194
High-order Rogue Wave solutions for the Coupled Nonlinear Schr\"{o}dinger Equations-II
We study on dynamics of high-order rogue wave in two-component coupled
nonlinear Schr\"{o}dinger equations. Based on the generalized Darboux
transformation and formal series method, we obtain the high-order rogue wave
solution without the special limitation on the wave vectors. As an application,
we exhibit the first, second-order rogue wave solution and the superposition of
them by computer plotting. We find the distribution patterns for vector rogue
waves are much more abundant than the ones for scalar rogue waves, and also
different from the ones obtained with the constrain conditions on background
fields. The results further enrich and deep our realization on rogue wave
excitation dynamics in such diverse fields as Bose-Einstein condensates,
nonlinear fibers, and superfluids.Comment: 9 pages, 7 figure
Darboux transformation and classification of solution for mixed coupled nonlinear Schr\"odinger equations
We derive generalized nonlinear wave solution formula for mixed coupled
nonlinear Sch\"odinger equations (mCNLSE) by performing the unified Darboux
transformation. We give the classification of the general soliton formula on
the nonzero background based on the dynamical behavior. Especially, the
conditions for breather, dark soliton and rogue wave solution for mCNLSE are
given in detail. Moreover, we analysis the interaction between dark-dark
soliton solution and breather solution. These results would be helpful for
nonlinear localized wave excitations and applications in vector nonlinear
systems.Comment: 28 pages, 9 figure
Efficient Deterministic Replay Using Complete Race Detection
Data races can significantly affect the executions of multi-threaded
programs. Hence, one has to recur the results of data races to
deterministically replay a multi-threaded program. However, data races are
concealed in enormous number of memory operations in a program. Due to the
difficulty of accurately identifying data races, previous multi-threaded
deterministic record/replay schemes for commodity multi-processor system give
up to record data races directly. Consequently, they either record all shared
memory operations, which brings remarkable slowdown to the production run, or
record the synchronization only, which introduces significant efforts to
replay.
Inspired by the advances in data race detection, we propose an efficient
software-only deterministic replay scheme for commodity multi-processor
systems, which is named RacX. The key insight of RacX is as follows: although
it is NP-hard to accurately identify the existence of data races between a pair
of memory operations, we can find out all potential data races in a
multi-threaded program, in which the false positives can be reduced to a small
amount with our automatic false positive reduction techniques. As a result,
RacX can efficiently monitor all potential data races to deterministically
replay a multi-threaded program.
To evaluate RacX, we have carried out experiments over a number of well-known
multi-threaded programs from SPLASH-2 benchmark suite and large-scale
commercial programs. RacX can precisely recur production runs of these programs
with value determinism. Averagely, RacX causes only about 1.21%, 1.89%, 2.20%,
and 8.41% slowdown to the original run during recording (for 2-, 4-, 8- and
16-thread programs, respectively). The soundness, efficiency, scalability, and
portability of RacX well demonstrate its superiority.Comment: 18 pages, 7 figure
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