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Quantitative estimates for bending energies and applications to non-local variational problems

Published online by Cambridge University Press:  23 January 2019

Michael Goldman
Affiliation:
Laboratoire Jacques-Louis Lions (CNRS, UMR 7598), Université Paris Diderot, F-75005Paris, France ([email protected])
Matteo Novaga
Affiliation:
Dipartimento di Matematica, Università di Pisa, Largo B. Pontecorvo 5, 56127Pisa, Italy ([email protected])
Matthias Röger
Affiliation:
Technische Universität Dortmund, Fakultät für Mathematik, Vogelpothsweg 87, D-44227 Dortmund, Germany ([email protected])

Abstract

We discuss a variational model, given by a weighted sum of perimeter, bending and Riesz interaction energies, that could be considered as a toy model for charged elastic drops. The different contributions have competing preferences for strongly localized and maximally dispersed structures. We investigate the energy landscape in dependence of the size of the ‘charge’, that is, the weight of the Riesz interaction energy.

In the two-dimensional case, we first prove that for simply connected sets of small elastica energy, the elastica deficit controls the isoperimetric deficit. Building on this result, we show that for small charge the only minimizers of the full variational model are either balls or centred annuli. We complement these statements by a non-existence result for large charge. In three dimensions, we prove area and diameter bounds for configurations with small Willmore energy and show that balls are the unique minimizers of our variational model for sufficiently small charge.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 2019

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