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Eduardo Longa
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Embeddedness and homology of a limit of minimal surfaces

Consider the following theorem, proved in this paper:

Theorem (Theorem 6.1). Suppose we have a sequence $(\Sigma_j, \partial \Sigma_j) \subset (M, \partial M)$ of immersed free boundary minimal $k$-dimensional submanifolds, where $1 \leq k \leq n$, with uniformly bounded area and second fundamental form. Then, after passing to a subsequence, $(\Sigma_j, \partial \Sigma_j)$ converges smoothly and locally uniformly to $(\Sigma, \partial \Sigma) \subset (M, \partial M)$, which is a smooth immersed free boundary minimal $k$-dimensional submanifold.

My questions are:

Question 1: If we assume additionally that all the submanifolds in the sequence are embedded, is it true that the limit surface is also embedded?

Question 2: If $M$ has dimension $3$ and $(\Sigma_j, \partial \Sigma_j)$ is a sequence of compact, connected, oriented and properly embedded free boundary minimal surfaces that converges as in the theorem to $(\Sigma, \partial \Sigma)$, is it true that there exists $N \geq 1$ such that $ [\Sigma_j] = [\Sigma] \in H_2(M, \partial M; \mathbb{Z})$ for all $j \geq N$?

Question 3: Let $M$ be compact, connected and oriented of dimension $3$ and $(\Sigma_j, \partial \Sigma_j)$ be a sequence of compact, connected, oriented and properly embedded free boundary minimal surfaces that converges as in the theorem to $(\Sigma, \partial \Sigma)$. If $[\Sigma_j] \neq 0 \in H_2(M, \partial M; \mathbb{Z})$ for every $j \geq 1$, is it true that $[\Sigma] \neq 0$?

Eduardo Longa
  • 2.1k
  • 12
  • 11