Results 11 to 20 of about 177 (45)
The twistor space of a quaternionic contact manifold [PDF]
, 2010 We show that the CR structure on the twistor space of a quaternionic contact structure described by Biquard is normal if and only if the Ricci curvature of the Biquard connection commutes with the endomorphisms in the quaternionic structure of the ...
Davidov, Johann +2 more
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Twistors and Bi-Hermitian Surfaces of Non-K\"ahler Type [PDF]
, 2014 The aim of this work is to give a twistor presentation of recent results about bi-Hermitian metrics on compact complex surfaces with odd first Betti ...
Fujiki, Akira, Pontecorvo, Massimiliano
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Depositional Environment of Fine-Grained Sedimentary Rocks of the Sinamar Formation, Muara Bungo, Jambi [PDF]
, 2013 DOI: 10.17014/ijog.v8i1.153The research area is situated in the northwestern side of South Sumatra Basin, which is a part of Muara Bungo Regency, Jambi Province.
Panggabean, H. (H), Zajuli, M. H. (M)
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Extended superalgebras from twistor and Killing spinors
, 2017 The basic first-order differential operators of spin geometry that are Dirac operator and twistor operator are considered. Special types of spinors defined from these operators such as twistor spinors and Killing spinors are discussed. Symmetry operators
Ertem, Ümit
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The Group of Quasisymmetric Homeomorphisms of the Circle and Quantization of the Universal Teichm\"uller Space [PDF]
, 2009 In the first part of the paper we describe the complex geometry of the universal Teichm\"uller space $\mathcal T$, which may be realized as an open subset in the complex Banach space of holomorphic quadratic differentials in the unit disc. The quotient $\
Sergeev, Armen G.
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Algebraic surfaces with infinitely many twistor lines
, 2019 We prove that a reduced and irreducible algebraic surface in $\mathbb{CP}^{3}$ containing infinitely many twistor lines cannot have odd degree. Then, exploiting the theory of quaternionic slice regularity and the normalization map of a surface, we give ...
Altavilla, Amedeo, Ballico, Edoardo
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Self-duality and associated parallel or cocalibrated ${\mathrm{G}}_2$ structures [PDF]
, 2019 We find a remarkable family of $\mathrm{G}_2$ structures defined on certain principal $\mathrm{SO}(3)$-bundles $P_\pm\longrightarrow M$ associated with any given oriented Riemannian 4-manifold $M$. Such structures are always cocalibrated.
Albuquerque, Rui
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The G_2 sphere over a 4-manifold
, 2006 We present a construction of a canonical G_2 structure on the unit sphere tangent bundle S_M of any given orientable Riemannian 4-manifold M. Such structure is never geometric or 1-flat, but seems full of other possibilities. We start by the study of the
A.L. Besse +16 more
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Exotica or the failure of the strong cosmic censorship in four dimensions [PDF]
, 2015 In this letter a generic counterexample to the strong cosmic censor conjecture is exhibited. More precisely---taking into account that the conjecture lacks any precise formulation yet---first we make sense of what one would mean by a "generic ...
Etesi, Gábor
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Generalized twistor spaces for hyperkähler manifolds [PDF]
, 2014 Let M be a hyperkaehler manifold. The S2-family of complex structures compatible with the hyperkaehler metric can be assembled into a single complex structure on Z = M × S2; the resulting complex manifold is known as the twistor space of M.
Glover, R., Sawon, J.
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