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21 papers · 1 filter
Holomorphic Cartan geometries and Calabi--Yau manifolds
Indranil Biswas, Benjamin McKay
We prove that the only Calabi--Yau projective manifolds which bear holomorphic Cartan geometries are precisely the abelian varieties. (Nous démontrons que les seules variétés proje…
AGN jet physics from measurements of the frequency-dependent position of the VLBI radio core
Shane P. O'Sullivan, Denise C. Gabuzda
Accurate measurement of the frequency-dependent shift of the self-absorbed radio core is required for multi-frequency analysis of VLBI data since absolute positional information is…
On the stability of self-gravitating accreting flows
Patryk Mach, Edward Malec
Analytic methods show stability of the stationary accretion of test fluids but they are inconclusive in the case of self-gravitating stationary flows. We investigate numerically st…
Extension Phenomena for Holomorphic Geometric Structures
Benjamin McKay
The most commonly encountered types of complex analytic G-structures and Cartan geometries cannot have singularities of complex codimension 2 or more.
Holomorphic Parabolic Geometries and Calabi-Yau Manifolds
Benjamin McKay
We prove that the only complex parabolic geometries on Calabi-Yau manifolds are the homogeneous geometries on complex tori. We also classify the complex parabolic geometries on hom…
Three dimensional magnetic field structure of six parsec-scale active galactic nuclei jets
Shane P. O'Sullivan, Denise C. Gabuzda
The parsec-scale Faraday rotation measure (RM) distribution of six "blazars" is investigated using multi-frequency (4.6--43 GHz) polarization observations taken on 2006 July 2 with…