Abstract
We study a geometric variational problem arising from modeling two-dimensional charged drops of a perfectly conducting liquid in the presence of an external potential. We characterize the semicontinuous envelope of the energy in terms of a parameter measuring the relative strength of the Coulomb interaction. As a consequence, when the potential is confining and the Coulomb repulsion strength is below a critical value, we show existence and regularity estimates for volume-constrained minimizers. We also derive the Euler–Lagrange equation satisfied by regular critical points, expressing the first variation of the Coulombic energy in terms of the normal \(\frac{1}{2}\)-derivative of the capacitary potential.
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Acknowledgements
The work of CBM was partially supported by NSF via grants DMS-1614948 and DMS-1908709. MN has been supported by GNAMPA-INdAM and by the University of Pisa via grant PRA 2017-18. BR was partially supported by the project ANR-18-CE40-0013 SHAPO financed by the French Agence Nationale de la Recherche (ANR) and the GNAMPA-INdAM Project 2019 “Ottimizzazione spettrale non lineare”.
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Communicated by A. Figalli.
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Muratov, C.B., Novaga, M. & Ruffini, B. Conducting Flat Drops in a Confining Potential. Arch Rational Mech Anal 243, 1773–1810 (2022). https://doi.org/10.1007/s00205-021-01738-0
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DOI: https://doi.org/10.1007/s00205-021-01738-0