Abstract
In this paper we study stationary graphs for functionals of geometric nature defined on currents or varifolds. The point of view we adopt is the one of differential inclusions, introduced in this context in the recent papers (De Lellis et al. in Geometric measure theory and differential inclusions, 2019. arXiv:1910.00335; Tione in Minimal graphs and differential inclusions. Commun Part Differ Equ 7:1–33, 2021). In particular, given a polyconvex integrand f, we define a set of matrices C_f that allows us to rewrite the stationarity condition for a graph with multiplicity as a differential inclusion. Then we prove that if f is assumed to be non-negative, then in C_f there is no T'_N configuration, thus recovering the main result of De Lellis et al. (Geometric measure theory and differential inclusions, 2019. arXiv:1910.00335) as a corollary. Finally, we show that if the hypothesis of non-negativity is dropped, one can not only find T'_N configurations in C_f, but it is also possible to construct via convex integration a very degenerate stationary point with multiplicity.
Highlights
In this paper we continue the study started in [5,26] of functionals arising from geometric variational problems from the point of view of differential inclusions
From the celebrated regularity theorem of Allard of [2], it is known that an ε-regularity theorem holds for stationary points of the area functional, namely the case in which ≡ 1
This paper focuses on the same problem as [5], i.e. regularity of stationary points for geometric integrands, but with the addition of considering graphs with arbitrary positive multiplicity
Summary
In this paper we continue the study started in [5,26] of functionals arising from geometric variational problems from the point of view of differential inclusions. The energies we consider are of the form (T ) =.
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