Sobolev inequalities for $(0,q)$ forms on CR manifolds of finite type

Details Sobolev inequalities for $(0,q)$ forms on CR manifolds of finite type Sobolev inequalities for $(0,q)$ forms on CR manifolds of finite type

2009-09-19

arxiv.org/abs/0909.3598v2

Mathematics

Analysis of PDEs

to appear in Math. Res. Lett.

Scientific paper

Let $M^{2n+1}$ ($n \geq 2$) be a compact pseudoconvex CR manifold of finite commutator type whose $\dbarb$ has closed range in $L^2$ and whose Levi form has comparable eigenvalues. We prove a sharp $L^1$ Sobolev inequality for the $\dbarb$ complex for $(0,q)$ forms when $q \ne 1$ nor $n-1$. We also prove an analogous $L^1$ inequality when $M$ satisfies condition $Y(q)$. The main technical ingredient is a new kind of $L^1$ duality inequality for vector fields that satisfy Hormander's condition.

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