Classification of K_F-orbits of Unipotent Elements in Symmetric F-varieties of SL(n, F)
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Date
2010-04-07
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Abstract
Richardson proved in 1982 that, given an algebraic group G and some involution, we could
have only a finite number of K-orbits of unipotent elements in the symmetric variety P = G/K over an algebraically closed field, where K is the fixed point group of the involution.
A question arises naturally: what if the field is not algebraically closed? In this thesis we try
to answer this question and go a little further by listing all K_F-orbits of unipotent elements in
P explicitly. We work on the symmetric F-variety P = G_F/K_F for the special linear group over
an arbitrary field F of characteristic not 2. We classify all K_F-orbits of unipotent elements in P
for all inner involutions for the special linear group. For Cartan (outer) involution, we classify
K-orbits for small n only and illustrate how to get the canonical form for general n. Further
proofs are still needed. We also classify G_F-orbits of unipotent elements in G_F.
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Keywords
unipotent elements, Jordan decomposition, special linear group, orbit decomposition, symmetric variety, Classifications
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Degree
PhD
Discipline
Applied Mathematics