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Structure of second-order symmetric Lorentzian manifolds

Oihane F. Blanco, Miguel Sánchez, José M. Senovilla (2013)

Journal of the European Mathematical Society

𝑆𝑒𝑐𝑜𝑛𝑑 - 𝑜𝑟𝑑𝑒𝑟𝑠𝑦𝑚𝑚𝑒𝑡𝑟𝑖𝑐𝐿𝑜𝑟𝑒𝑛𝑡𝑧𝑖𝑎𝑛𝑠𝑝𝑎𝑐𝑒𝑠 , that is to say, Lorentzian manifolds with vanishing second derivative R 0 of the curvature tensor R , are characterized by several geometric properties, and explicitly presented. Locally, they are a product M = M 1 × M 2 where each factor is uniquely determined as follows: M 2 is a Riemannian symmetric space and M 1 is either a constant-curvature Lorentzian space or a definite type of plane wave generalizing the Cahen–Wallach family. In the proper case (i.e., R 0 at some point), the curvature tensor turns out to...

Sur les quotients discrets de semi-groupes complexes

Christian Miebach (2010)

Annales de la faculté des sciences de Toulouse Mathématiques

Soit X = G / K un espace symétrique hermitien irréducible de type non-compact et soit S G le semi-groupe associé formé des compressions de X . Soit Γ G un sous-groupe discret. Nous donnons une condition suffisante pour que le quotient Γ S soit une variété de Stein. En outre nous démontrons qu’en général Γ S n’est pas de Stein ce qui réfute une conjecture de Achab, Betten et Krötz.

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