Caudrelier, V. & Doyon, B. (2015). The Quench Map in an Integrable Classical Field Theory: Nonlinear Schrödinger Equation. ..

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Abstract
We study the nonequilibrium dynamics obtained by an abrupt change (a {\em quench}) in the parameters of an integrable classical field theory, the nonlinear Schr\"odinger equation. We first consider explicit onesoliton examples, which we fully describe by solving the direct part of the inverse scattering problem. We then develop some aspects of the general theory using elements of the inverse scattering method. For this purpose, we introduce the {\em quench map} which acts on the space of scattering data and represents the change of parameter with fixed field configuration (initial condition). We describe some of its analytic properties by implementing a higher level version of the inverse scattering method, and we discuss the applications of DarbouxB\"acklund transformations, GelfandLevitanMarchenko equations and the Rosales series solution to a related, dual quench problem. Finally, we comment on the interplay between quantum and classical tools around the theme of quenches and on the usefulness of the quantization of our classical approach to the quantum quench problem.
Item Type:  Monograph (Working Paper) 

Uncontrolled Keywords:  quench, integrable PDE, integrable classical field theory, inverse scattering method, nonlinear Schr¨odinger equation 
Subjects:  Q Science > QC Physics 
Divisions:  School of Engineering & Mathematical Sciences > Department of Mathematical Science 
URI:  http://openaccess.city.ac.uk/id/eprint/14241 
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