Tannakian duality for Anderson-Drinfeld motives and algebraic independence of Carlitz logarithms

Details Tannakian duality for Anderson-Drinfeld motives and algebraic independence of Carlitz logarithms Tannakian duality for Anderson-Drinfeld motives and algebraic independence of Carlitz logarithms

2005-06-04

arxiv.org/abs/math/0506078v2

Invent. Math. 171 (2008) 123-174

Mathematics

Number Theory

39 pages

Scientific paper

10.1007/s00222-007-0073-y

We develop a theory of Tannakian Galois groups for t-motives and relate this to the theory of Frobenius semilinear difference equations. We show that the transcendence degree of the period matrix associated to a given t-motive is equal to the dimension of its Galois group. Using this result we prove that Carlitz logarithms of algebraic functions that are linearly independent over the rational function field are algebraically independent.

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