The geometry of SO(p) × SO(q)-invariant special Lagrangian cones
SO(p) × SO(q)-invariant special Lagrangian cones in ℂp+q(equivalently, SO(p) × SO(q)-invariant special Legendrians in S2(p+q)-1) are an important family of special Lagrangians (SL) whose basic features were studied in our previous paper . In some ways, they play a role analogous to that of Delaunay surfaces in the geometry of CMC surfaces in ℝ3; in particular, they are natural building blocks for our gluing constructions of higher-dimensional SL cones [9, 10, 12]. In this article, we study in detail their geometry paying special attention to features needed in our gluing constructions. In particular, we classify them up to congruence; we determine their full group of symmetries (including various discrete symmetries) in all cases; we prove that many of them are closed and embedded; and finally understand the limiting singular geometry with detailed asymptotics. In understanding the detailed asymptotics a fundamental role is played by a certain conserved quantity (a component of the torque) considered in .
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