Spectral optimisation of Dirac rectangles


Abstract in English

We are concerned with the dependence of the lowest positive eigenvalue of the Dirac operator on the geometry of rectangles, subject to infinite-mass boundary conditions. It is shown that the square is the global minimiser both under the area or perimeter constraints. Contrary to well-known non-relativistic analogues, the present spectral problem does not admit explicit solutions. Our approach is based on a variational re-formulation, symmetries of the rectangles and a trick passing through a non-convex minimisation problem. We leave as an open problem whether the square is the only minimiser of these spectral-optimisation problems.

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