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Second-order L variational problems and the ∞-polylaplacian

  • Nikos Katzourakis ORCID logo EMAIL logo und Tristan Pryer
Veröffentlicht/Copyright: 27. Januar 2018

Abstract

In this paper we initiate the study of second-order variational problems in L, seeking to minimise the L norm of a function of the hessian. We also derive and study the respective PDE arising as the analogue of the Euler–Lagrange equation. Given HC1(sn×n), for the functional

E(u,𝒪)=H(D2u)L(𝒪),uW2,(Ω),𝒪Ω,

the associated equation is the fully nonlinear third-order PDE

A2u:=(HX(D2u))3:(D3u)2=0.

Special cases arise when H is the Euclidean length of either the full hessian or of the Laplacian, leading to the -polylaplacian and the -bilaplacian respectively. We establish several results for (1) and (2), including existence of minimisers, of absolute minimisers and of “critical point” generalised solutions, proving also variational characterisations and uniqueness. We also construct explicit generalised solutions and perform numerical experiments.


Communicated by Juan Manfredi


Acknowledgements

Nikos Katzourakis would like to thank Craig Evans, Robert Jensen, Roger Moser, Juan Manfredi and Jan Kristensen for their inspiring mathematical discussions and especially their illuminating remarks on 𝒟-solutions and on second-order L variational problems.

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Received: 2016-11-04
Revised: 2018-01-03
Accepted: 2018-01-05
Published Online: 2018-01-27
Published in Print: 2020-04-01

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