489 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Netherlands Institute for Radio AstronomyNL23 papers
- Belarusian State UniversityBY14 papers
- Leibniz Institute for Astrophysics PotsdamDE14 papers
- Polish Academy of SciencesPL14 papers
- Thüringer Landessternwarte TautenburgDE14 papers
- University of ManchesterGB14 papers
- University of WarsawPL14 papers
- Leiden UniversityNL13 papers
- Centre National de la Recherche ScientifiqueFR12 papers
- Radboud University NijmegenNL12 papers
- Rutherford Appleton LaboratoryGB12 papers
- Bielefeld UniversityDE11 papers
8 papers · 1 filter
To theory of asymptotically stable accelerating Universe in Riemann-Cartan spacetime
A. S. Garkun, V. I. Kudin, A. V. Minkevich
Homogeneous isotropic cosmological models built in the framework of the Poincaré gauge theory of gravity based on general expression of gravitational Lagrangian with indefinite par…
On symplectically fat twistor bundles
Maciej Bochenski, Anna Szczepkowska, Aleksy Tralle +1
This paper deals with the question when are twistor bundles over homogeneous spaces symplectically fat? It shows that twistor bundles over even dimensional Grassmannians of maximal…
Simply-connected K-contact and Sasakian manifolds of dimension 7
Vicente Munoz, Aleksy Tralle
We construct a compact simply-connected 7-dimensional manifold admitting a K-contact structure but not a Sasakian structure. We also study rational homotopy properties of such mani…
A restriction on proper actions on homogeneous spaces of reductive type
Maciej Bochenski, Marek Ogryzek
Let L be a reductive subgroup of a reductive Lie group G. Let G/H be a homogeneous space of reductive type. We provide a necessary condition for the properness of the action of L o…
Homotopy theory for digraphs
Alexander Grigor'yan, Yong Lin, Yuri Muranov +1
We introduce a homotopy theory of digraphs (directed graphs) and prove its basic properties, including the relations to the homology theory of digraphs constructed by the authors i…
Proper SL(2,R)-actions on homogeneous spaces
Maciej Bochenski, Piotr Jastrzebski, Takayuki Okuda +1
We study the existence problem of proper actions of SL(2,R) on homogeneous spaces G/H of reductive type. Based on Kobayashi's properness criterion [Math. Ann. (1989)], we show that…
On formality of Sasakian manifolds
Indranil Biswas, Marisa Fernández, Vicente Muñoz +1
We investigate some topological properties, in particular formality, of compact Sasakian manifolds. Answering some questions raised by Boyer and Galicki, we prove that all higher (…
Free and properly discontinuous actions of groups on homotopy -spheres
Marek Golasinski, Daciberg Lima Goncalves, Rolando Jimenez
Let be a group acting freely, properly discontinuously and cellularly on a finite dimensional W-complex which has the homotopy type of the - sphere $\mathbb{S}^{…