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Curvature and symmetries of closed four-manifolds with a lower curvature bound
Bosgraaf, Austin
Bosgraaf, Austin
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2020-05
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This thesis details homeomorphism classi cation theorems for closed, simply
connected, Riemannian 4-manifolds admitting an isometric circle action. We proceed
by imposing progressively weaker curvature conditions, which results in a slight
weakening of the classi cation. In particular, we consider positive, non-negative, and
almost non-negative sectional curvature. For positive curvature, the homeomorphism
classi cation is obtained by Hsiang and Kleiner in [24] and the equivariant di eomorphism
classi cation by Grove and Searle in [18] and Grove and Wilking in [19]. For
non-negative sectional curvature, we look to the independent work of Kleiner in his
thesis [25], and Searle and Yang in [35] for the homeomorphism classi cation, which
was then improved to a di eomorphism classi cation by work of Galaz-Garc a [13],
and Grove and Wilking in [19]. For almost non-negative curvature, the recent work
of Harvey and Searle in [22] gives the di eomorphism classi cation, which coincides
with the classi cation for non-negatively curved manifolds. In fact, they show that
almost non-negative curvature in this setting implies the existence of an S1-invariant
metric of non-negative curvature.
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Thesis (M.S.)-- Wichita State University, College of Liberal Arts and Sciences, Dept. of Mathematics, Statistics, and Physics
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Wichita State University
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Copyright 2020 by Austin Bosgraaf
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