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Title:  Loewner Theory in Several Complex Variables and Related Problems 
Authors:  Voda, Mircea Iulian 
Advisor:  Graham, Ian 
Department:  Mathematics 
Keywords:  Loewner chains several complex variables extreme points Caratheodory mappings spirallike mappings Loewner chain equation resonances parametric representation 
Issue Date:  11Jan2012 
Abstract:  The first part of the thesis deals with aspects of Loewner theory in several complex variables.
First we show that a Loewner chain with minimal regularity assumptions (Df(0,t) of local bounded variation) satisfies an associated Loewner equation. Next we give a way of renormalizing a general Loewner chain so that it corresponds to the same increasing family of domains. To do this
we will prove a generalization of the converse of Carathéodory's kernel convergence theorem.
Next we address the problem of finding a Loewner chain solution to a given Loewner chain equation.
The main result is a complete solution in the case when the infinitesimal generator satisfies Dh(0,t)=A where inf {Re<Az,z>: z =1}> 0. We will see that the existence of a bounded solution depends on the real resonances of A, but there always exists a polynomially bounded solution.
Finally we discuss some properties of classes of biholomorphic mappings associated to Anormalized Loewner chains. In particular we give a characterization of the compactness of the class of spirallike
mappings in terms of the resonance of A.
The second part of the thesis deals with the problem of finding examples of extreme points for some
classes of mappings. We see that straightforward generalizations of one dimensional extreme functions give examples of extreme Carathéodory mappings and extreme starlike mappings on the polydisc, but not on the ball. We also find examples of extreme Carathéodory mappings on the ball
starting from a known example of extreme Carathéodory function in higher dimensions. 
URI:  http://hdl.handle.net/1807/31964 
Appears in Collections:  Doctoral

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