Math @ Duke

Publications [#244281] of Xin Zhou
Papers Published
 Deift, P; Venakides, S; Zhou, X, An extension of the steepest descent method for RiemannHilbert problems: the small dispersion limit of the Kortewegde Vries (KdV) equation.,
Proceedings of the National Academy of Sciences of the United States of America, vol. 95 no. 2
(January, 1998),
pp. 450454, ISSN 00278424 [11038618]
(last updated on 2018/10/14)
Abstract: This paper extends the steepest descent method for RiemannHilbert problems introduced by Deift and Zhou in a critical new way. We present, in particular, an algorithm, to obtain the support of the RiemannHilbert problem for leading asymptotics. Applying this extended method to small dispersion KdV (Kortewegde Vries) equation, we (i) recover the variational formulation of P. D. Lax and C. D. Levermore [(1979) Proc. Natl. Acad. Sci. USA76, 36023606] for the weak limit of the solution, (ii) derive, without using an ansatz, the hyperelliptic asymptotic solution of S. Venakides that describes the oscillations; and (iii) are now able to compute the phase shifts, integrating the modulation equations exactly. The procedure of this paper is a version of fully nonlinear geometrical optics for integrable systems. With some additional analysis the theory can provide rigorous error estimates between the solution and its computed asymptotic expression.


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