Volume minimization and estimates for certain isotropic submanifolds in complex projective spaces

Details Volume minimization and estimates for certain isotropic submanifolds in complex projective spaces Volume minimization and estimates for certain isotropic submanifolds in complex projective spaces

2004-06-16

arxiv.org/abs/math/0406334v3

Mathematics

Differential Geometry

5 pages, to be published in Asian Journal of Mathematics

Scientific paper

In this note we show the following result using the integral-geometric formula of R. Howard: Consider the totally geodesic $\mathbb{R}P^{2m}$ in $\mathbb{C}P^n$. Then it minimizes volume among the isotropic submanifolds in the same $\mathbb{Z}/2$ homology class in $\mathbb{C}P^n$ (but not among all submanifolds in this $\mathbb{Z}/2$ homology class). Also the totally geodesic $\mathbb{R}P^{2m-1}$ minimizes volume in its Hamiltonian deformation class in $\mathbb{C}P^n$. As a corollary we'll give estimates for volumes of Lagrangian submanifolds in complete intersections in $\mathbb{C}P^n$.

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