49 citations · 113 across the 27 of their papers we have counts for
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math.DG2012
The sharp lower bound of the first eigenvalue of the sub-Laplacian on a quaternionic contact manifold in dimension seven
Stefan Ivanov, Alexander Petkov, Dimiter Vassilev
A version of Lichnerowicz' theorem giving a lower bound of the eigenvalues of the sub-Laplacian under a lower bound on the Sp(1)Sp(1) component of the qc-Ricci curvature on a compa…
math.DG2012
An Obata-type theorem on a three-dimensional CR manifold
Stefan Ivanov, Dimiter Vassilev
We prove a CR version of the Obata's result for the first eigenvalue of the sub-Laplacian in the setting of a compact strictly pseudoconvex pseudohermitian three dimensional manifo…
math.DG2012★ 1 cited
An Obata type result for the first eigenvalue of the sub-Laplacian on a CR manifold with a divergence free torsion
Stefan Ivanov, Dimiter Vassilev
We prove a CR Obata type result that if the first positive eigenvalue of the sub-Laplacian on a compact strictly pseudoconvex pseudohermitian manifold with a divergence free pseudo…