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On small groups of finite Morley rank with a tight automorphism
We consider an infinite simple group of finite Morley rank of Pr\"{u}fer
-rank which admits a tight automorphism whose fixed-point
subgroup is pseudofinite. We prove that contains a
subgroup isomorphic to the Chevalley group , where is a
pseudofinite field of characteristic . Moreover, we prove that, if
is of positive characteristic and if is a square in , then for some algebraically closed field of characteristic
. These results are based on the work of the second author, where a new
strategy to approach the Cherlin-Zilber Conjecture--stating that infinite
simple groups of finite Morley rank are isomorphic algebraic groups over
algebraically closed fields--was developed.
In this version, we have corrected typos and clarified the proofs of some
lemmas.Comment: 31 page