10 citations · 43 across the 17 of their papers we have counts for
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Quaternionic contact structure with integrable complementary distribution
Yoshinobu Kamishima
We study positive definite quaternionic contact -manifolds (-manifold for short). Just like the -structure contains the class of Sasaki manifolds, the -structur…
Torus Actions and the Halperin-Carlsson Conjecture
Y. Kamishima, M. Nakayama
We give an affirmative answer to the Halperin-Carlsson conjecture for the homologically injective torus actions on closed manifolds. This class contains holomorphic torus actions o…
Lorentzian similarity manifold
Yoshinobu Kamishima
If an -manifold is locally modeled on $\RR^{m+2}$ with coordinate changes lying in the subgroup $G=\RR^{m+2}\rtimes ({\rO}(m+1,1)\times \RR^+)$ of the affine group ${\rA}(…
Pseudo-conformal quaternionic CR structure on (4n+3)-dimensional manifolds
Dmitri Alekseevsky, Yoshinobu Kamishima
The purpose of this paper is to introduce a geometric structure called pseudo-conformal quaternionic CR structure on a (4n+3)-dimensional mamnifold and then exhibit a quaternionic…