30 citations · 244 across the 39 of their papers we have counts for
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A contact-geometric variant of Smale's contraction
Florian Buck, Christopher Schmidt, Kai Zehmisch
Motivated by Smale's contraction of the compactly supported diffeomorphism group of the two-disc, we study contact forms on an open rotationally symmetric Darboux ball that agree w…
Contactomorphic vertically convex domains
Jan Eyll, Jonas Fritsch, Kai Zehmisch
We consider the standard Darboux space equipped with the radial symmetric contact form. We study co-orientation preserving contactomorphisms between relatively compact domains up t…
Fitting without fittings
Johanna Bimmermann, Bernd Stratmann, Kai Zehmisch
We show that all symplectically aspherical fillings of the unit cotangent bundle of a given odd-dimensional sphere are diffeomorphic to the corresponding unit co-disc bundle. The c…
Connected sums of Brieskorn contact -spheres
Florian Buck, Kai Zehmisch
In dimension , the contact connected sum of Brieskorn contact spheres is, in general, not a Brieskorn contact sphere.
Symplectic fillings of unit cotangent bundles of hyperbolic surfaces
Hansjörg Geiges, Kai Zehmisch
We consider strong symplectic fillings of the unit cotangent bundle of a hyperbolic surface, equipped with its canonical contact structure. We show that every finitely presentable…
Symplectic capacities of disc cotangent bundles of flat tori
Gabriele Benedetti, Johanna Bimmermann, Kai Zehmisch
We show that on the unit disc cotangent bundle of flat Riemannian tori, all normalized capacities coincide with twice the systole. The same result holds for flat, reversible Finsle…