On Dwork's accessory parameter problem

2002 ◽  
Vol 241 (2) ◽  
pp. 425-444 ◽  
Author(s):  
Frits Beukers
Keyword(s):  
Accessory Parameter ◽  
Parameter Problem

scholarly journals Accessory parameters in conformal mapping: exploiting the isomonodromic tau function for Painlevé VI

2018 ◽  
Vol 474 (2216) ◽  
pp. 20180080 ◽  
Author(s):  
Tiago Anselmo ◽  
Rhodri Nelson ◽  
Bruno Carneiro da Cunha ◽  
Darren G. Crowdy
Keyword(s):  
Conformal Mapping ◽  
Asymptotic Expansions ◽  
Numerical Approach ◽  
Young Diagrams ◽  
Target Domain ◽  
Conformal Maps ◽  
Circular Arc ◽  
Tau Function ◽  
Accessory Parameter ◽  
Parameter Problem

We present a novel method to solve the accessory parameter problem arising in constructing conformal maps from a canonical simply connected planar region to the interior of a circular arc quadrilateral. The Schwarz–Christoffel accessory parameter problem, relevant when all sides have zero curvature, is also captured within our approach. The method exploits the isomonodromic tau function associated with the Painlevé VI equation. Recently, these tau functions have been shown to be related to certain correlation functions in conformal field theory and asymptotic expansions have been given in terms of tuples of the Young diagrams. After showing how to extract the monodromy data associated with the target domain, we show how a numerical approach based on the known asymptotic expansions can be used to solve the conformal mapping accessory parameter problem. The viability of this new method is demonstrated by explicit examples and we discuss its extension to circular arc polygons with more than four sides.

scholarly journals On the Spectral Parameter Problem

2009 ◽  
Vol 109 (1) ◽  
pp. 239-255 ◽  
Author(s):  
Michal Marvan
Keyword(s):  
Spectral Parameter ◽  
Parameter Problem
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