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On Euler–Dierkes–Huisken variational problem

  • Hongbin Cui,
  • Xiaowei Xu

摘要

In this paper, we study the stability and minimizing properties of higher codimensional surfaces in Euclidean space associated with the f-weighted area-functional \(\begin{aligned} \mathcal {E}_f(M)=\int _M f(x)\; d \mathcal {H}_k \end{aligned}\) E f ( M ) = M f ( x ) d H k with the density function \(f(x)=g(|x|)\) f ( x ) = g ( | x | ) and g(t) is non-negative, which develop the recent works by U. Dierkes and G. Huisken (Math Ann, 20 October 2023) on hypersurfaces with the density function \(|x|^\alpha \) | x | α . Under suitable assumptions on g(t), we prove that minimal cones with globally flat normal bundles are f-stable, and we also prove that the minimal cones satisfy the Lawlor curvature criterion, the determinantal varieties and the Pfaffian varieties without some exceptional cases are f-minimizing. As an application, we show that k-dimensional cones over product of spheres are \(|x|^\alpha \) | x | α -stable for \(\alpha \ge -k+2\sqrt{2(k-1)}\) α - k + 2 2 ( k - 1 ) , the oriented stable minimal hypercones are \(|x|^\alpha \) | x | α -stable for \(\alpha \ge 0\) α 0 , and we also show that the cones over product of spheres \(\mathcal {C}=C \left( S^{k_1} \times \cdots \times S^{k_{m}}\right) \) C = C S k 1 × × S k m are \(|x|^\alpha \) | x | α -minimizing for \(\dim \mathcal {C} \ge 7\) dim C 7 , \(k_i>1\) k i > 1 and \(\alpha \ge 0\) α 0 , the Simons cones \(C(S^{p} \times S^{p})\) C ( S p × S p ) are \(|x|^\alpha \) | x | α -minimizing for \(\alpha \ge 1\) α 1 , which relaxes the assumption \(1\le \alpha \le 2p\) 1 α 2 p in Dierkes and Huisken ( Math Ann, https://doi.org/10.1007/s00208-023-02726-3, 2023). Recently, Dierkes (Rend Sem Mat Univ Padova, 2024) prove that \(C(S^{p} \times S^{p})\) C ( S p × S p ) are \(|x|^\alpha \) | x | α -minimizing for \(\alpha \ge 3-p\) α 3 - p , which has improved our assumption \(\alpha \ge 1\) α 1 for \(p\ge 3\) p 3 .