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Download E-books The Geometry of Walker Manifolds (Synthesis Lectures on Mathematics and Statistics) PDF

By Eduardo García-Río, Miguel Brozos-Vázquez, Rámon Vázquez-Lorenzo, Stana Nikcevic‌

This booklet, which makes a speciality of the research of curvature, is an advent to varied features of pseudo-Riemannian geometry. we will use Walker manifolds (pseudo-Riemannian manifolds which admit a non-trivial parallel null airplane box) to exemplify the various major modifications among the geometry of Riemannian manifolds and the geometry of pseudo-Riemannian manifolds and thereby illustrate phenomena in pseudo-Riemannian geometry which are relatively diverse from these which happen in Riemannian geometry, i.e. for indefinite rather than confident yes metrics. Indefinite metrics are vital in lots of varied actual contexts: classical cosmological versions (general relativity) and string concept to call yet . Walker manifolds seem certainly in several actual settings and supply examples of extremal mathematical events as could be mentioned almost immediately. to explain the geometry of a pseudo-Riemannian manifold, one needs to first comprehend the curvature of the manifold. we will examine a large choice of curvature homes and we will derive either geometrical and topological effects. particular cognizance can be paid to manifolds of size three as those are really tractable. We then move to the four dimensional atmosphere as a gateway to raised dimensions. because the e-book is geared toward a really basic viewers (and particularly to a complicated undergraduate or to a starting graduate student), not more than a simple direction in differential geometry is needed within the means of historical past. to maintain our remedy as self-contained as attainable, we will start with simple chapters that supply an advent to simple facets of pseudo-Riemannian geometry earlier than starting on our learn of Walker geometry. an intensive bibliography is equipped for additional examining. desk of Contents: easy Algebraic Notions / uncomplicated Geometrical Notions / Walker constructions / three-d Lorentzian Walker Manifolds / 4-dimensional Walker Manifolds / The Spectral Geometry of the Curvature Tensor / Hermitian Geometry / precise Walker Manifolds

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