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MONGE–AMPERE ITERATION

dc.contributor.advisorRubinstein, Yanir A.en_US
dc.contributor.authorHunter, Ryanen_US
dc.date.accessioned2018-01-23T06:42:45Z
dc.date.available2018-01-23T06:42:45Z
dc.date.issued2017en_US
dc.identifierhttps://doi.org/10.13016/M2CV4BT1K
dc.identifier.urihttp://hdl.handle.net/1903/20369
dc.description.abstractIn this thesis we introduce a Monge–Amp`ere iteration to be a sequence of convex functions {ϕi}i∈N which solve the sequence of Monge–Amp`ere equations det(∇2ϕi+1) = h ◦ ϕi with second boundary values ∇ϕi+1(Rn) = A where h is a function of one variable and A is a bounded, convex set. Our main analytic theorem gives sufficient conditions on the function h and the set A so that a Monge– Amp`ere iteration {ϕi}, once correctly normalized, converges smoothly on compact sets to a convex solution of the Monge–Amp`ere equation det(∇2ϕ) = h ◦ ϕ with second boundary value ∇ϕ(Rn) = A. Monge–Amp`ere iterations {ϕi}i∈N arise as a sequence of solutions to optimal transport problems, so our convergence result can be interpreted as breaking apart the Monge–Amp`ere equation det(∇2ϕ) = h◦ϕ, ∇ϕ(Rn) = A into a sequence of optimal transport problems. We then turn to two geometric applications of our main theorem. The first application, when h(t) = e−t, is to Ricci iteration, which was introduced by Rubinstein. We prove a sequence {ωi}i∈N of toric Ka¨hler metrics with fixed edge singularities solving the K¨ahler–Ricci iteration on a toric Fano manifold converges, after being twisted by automorphisms, to a Ka¨hler–Einstein metric with the same singularities. This extends the smooth K¨ahler–Ricci iteration convergence theorem of Darvas–Rubinstein [12] to edge metrics on toric Fano manifolds. The second geometric application, when h(t) = t−(n+2), is to affine differential geometry. We introduce the affine iteration to be a sequence of graph immersions fi : Rn ,→ Rn+1 such that the affine normal at fi+1(x) is a constant multiple of the position vector fi(x). Thus, the affine iteration is a sequence of prescribed affine normal problems. We prove for any affine iteration {fi}i∈N there exists a sequence of matrices Mi ∈ Sln+1R such that {Mi ·fi(Rn)} converges smoothly to an affine sphere.en_US
dc.language.isoenen_US
dc.titleMONGE–AMPERE ITERATIONen_US
dc.typeDissertationen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentMathematicsen_US
dc.subject.pqcontrolledMathematicsen_US


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