کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4605783 1631349 2016 40 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pure spinors, intrinsic torsion and curvature in even dimensions
ترجمه فارسی عنوان
اسپینورهای خالص، چرخش ذاتی و انحنای در ابعاد حتی
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات آنالیز ریاضی
چکیده انگلیسی

We study the geometric properties of a 2m  -dimensional complex manifold MM admitting a holomorphic reduction of the frame bundle to the structure group P⊂Spin(2m,C)P⊂Spin(2m,C), the stabiliser of the line spanned by a pure spinor at a point. Geometrically, MM is endowed with a holomorphic metric g, a holomorphic volume form, a spin structure compatible with g, and a holomorphic pure spinor field ξ up to scale. The defining property of ξ is that it determines an almost null structure, i.e. an m  -plane distribution NξNξ along which g is totally degenerate.We develop a spinor calculus, by means of which we encode the geometric properties of NξNξ corresponding to the algebraic properties of the intrinsic torsion of the P-structure. This is the failure of the Levi-Civita connection ∇ of g to be compatible with the P-structure. In a similar way, we examine the algebraic properties of the curvature of ∇.Applications to spinorial differential equations are given. In particular, we give necessary and sufficient conditions for the almost null structure associated to a pure conformal Killing spinor to be integrable. We also conjecture a Goldberg–Sachs-type theorem on the existence of a certain class of almost null structures when (M,g)(M,g) has prescribed curvature.We discuss applications of this work to the study of real pseudo-Riemannian manifolds.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Differential Geometry and its Applications - Volume 46, June 2016, Pages 164–203
نویسندگان
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