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2021 Nonlinear spectral decompositions by gradient flows of one-homogeneous functionals
Leon Bungert, Martin Burger, Antonin Chambolle, Matteo Novaga
Anal. PDE 14(3): 823-860 (2021). DOI: 10.2140/apde.2021.14.823

Abstract

This paper establishes a theory of nonlinear spectral decompositions by considering the eigenvalue problem related to an absolutely one-homogeneous functional in an infinite-dimensional Hilbert space. This approach is motivated by works for the total variation, where interesting results on the eigenvalue problem and the relation to the total variation flow have been proven previously, and by recent results on finite-dimensional polyhedral seminorms, where gradient flows can yield spectral decompositions into eigenvectors.

We provide a geometric characterization of eigenvectors via a dual unit ball and prove that they are subgradients of minimal norm. This establishes the connection to gradient flows, whose time evolution is a decomposition of the initial condition into subgradients of minimal norm. If these are eigenvectors, this implies an interesting orthogonality relation and the equivalence of the gradient flow to a variational regularization method and an inverse scale space flow. Indeed we verify that all scenarios where these equivalences were known before by other arguments — such as one-dimensional total variation, multidimensional generalizations to vector fields, or certain polyhedral seminorms — yield spectral decompositions, and we provide further examples. We also investigate extinction times and extinction profiles, which we characterize as eigenvectors in a very general setting, generalizing several results from literature.

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Leon Bungert. Martin Burger. Antonin Chambolle. Matteo Novaga. "Nonlinear spectral decompositions by gradient flows of one-homogeneous functionals." Anal. PDE 14 (3) 823 - 860, 2021. https://doi.org/10.2140/apde.2021.14.823

Information

Received: 9 February 2019; Revised: 25 September 2019; Accepted: 2 December 2019; Published: 2021
First available in Project Euclid: 25 June 2021

Digital Object Identifier: 10.2140/apde.2021.14.823

Subjects:
Primary: 35P10 , 35P30 , 47J10

Keywords: extinction profiles , gradient flows , Nonlinear eigenvalue problems , nonlinear spectral decompositions , one-homogeneous functionals

Rights: Copyright © 2021 Mathematical Sciences Publishers

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Vol.14 • No. 3 • 2021
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