The matrix Riemann-Hilbert factorization approach is used to derive the leading-order, exponentially small asymptotics as t --\* +oo such that x/t ~ O(1) of solutions to the Cauchy problem for the defocusing nonlinear Schr6dinger equation, iOtu + 02xu -2([ul 2 -1)u = 0, with finite density initial d
Exponentially small expansions in the asymptotics of the Wright function
β Scribed by R.B. Paris
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 1013 KB
- Volume
- 234
- Category
- Article
- ISSN
- 0377-0427
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β¦ Synopsis
We consider exponentially small expansions present in the asymptotics of the generalised hypergeometric function, or Wright function, p Ξ¨ q (z) for large |z| that have not been considered in the existing theory. Our interest is principally with those functions of this class that possess either a finite algebraic expansion or no such expansion and with parameter values that produce exponentially small expansions in the neighbourhood of the negative real z axis. Numerical examples are presented to demonstrate the presence of these exponentially small expansions.
π SIMILAR VOLUMES
apparently new expansion of the exponential integral El in incomplete gamma functions is presented and shown to be a limiting csse of a more general expansion given by Mcomi in 1950 without proof. This latter expansion is proved here by interpreting it as a "multiplication theorem". A companion resu
## Abstract We provide a rigorous derivation of an asymptotic formula for perturbations in the eigenvalues caused by the presence of a finite number of inhomogeneities of small diameter with conductivity different from the background conductivity. Copyright Β© 2003 John Wiley & Sons, Ltd.