Horizontal sections of connections on curves and transcendence
ACTA ARITHMETICA(2013)
Abstract
Let $K$ be a number field, $\UX$ be a smooth projective curve over it and $D$
be a reduced divisor on $\UX$. Let $(E,\nabla)$ be a fibre bundle with
connection having meromorphic poles on $D$. Let $p_1,...,p_s\in\UX(K)$ and
$X:=\UX\setminus\{D,p_1,..., p_s\}$ (the $p_j$'s may be in the support of $D$).
Using tools from Nevanlinna theory and formal geometry, we give the definition
of $E$--section of type $\alpha$ of the vector bundle $E$ with respect to the
points $p_j$; this is the natural generalization of the notion of $E$ function
defined in Siegel Shidlowski theory. We prove that the value of a $E$--section
of type $\alpha$ in an algebraic point different from the $p_j$'s has maximal
transcendence degree. Siegel Shidlowski theorem is a special case of the
theorem proved. We give an application to isomonodromic connections.
MoreTranslated text
Key words
transcendence theory,connections,Nevanlinna theory,Siegel-Shidlovskii theorem
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