By Andrei Moroianu

Kähler geometry is a gorgeous and exciting region of arithmetic, of considerable study curiosity to either mathematicians and physicists. This self-contained 2007 graduate textual content offers a concise and obtainable advent to the subject. The ebook starts with a assessment of simple differential geometry, earlier than relocating directly to an outline of complicated manifolds and holomorphic vector bundles. Kähler manifolds are mentioned from the viewpoint of Riemannian geometry, and Hodge and Dolbeault theories are defined, including an easy facts of the well-known Kähler identities. the ultimate a part of the textual content reports numerous points of compact Kähler manifolds: the Calabi conjecture, Weitzenböck thoughts, Calabi-Yau manifolds, and divisors. All sections of the publication finish with a chain of workouts and scholars and researchers operating within the fields of algebraic and differential geometry and theoretical physics will locate that the e-book offers them with a valid knowing of this conception.

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**Extra info for Lectures on Kähler Geometry (London Mathematical Society Student Texts, Volume 69)**

**Sample text**

11, for every t0 ∈ I and u ∈ π −1 (xt0 ), there exists a unique integral curve (t, ut ) of X in x∗ P defined on some open interval Ut0 containing t0 . 3) shows that ut is horizontal in P . 6. Holonomy 43 ut a is also horizontal for every a ∈ G. Consequently, the open set of definition Ut0 of the local horizontal lifts defined above does not depend on the element u of the fibre π −1 (xt0 ). By compactness, we can choose a finite number of such neighbourhoods which cover [0, 1], and construct the global horizontal lift inductively, using again the right invariance.

XN ) = (x1 , . . , xn ). The section of P which corresponds in these coordinates to the inverse of the isomorphism π∗ : Hu → Tx M is then horizontal at x. 8. A covariant derivative on a vector bundle E over a manifold M induces a connection on its frame bundle Gl(E). Conversely, a connection on a G-principal bundle P over M induces in a canonical way a covariant derivative on all vector bundles associated to P by a linear representation ρ of G. If G = Glk (R) and ρ is the identity, these two constructions are inverse to each other.

Let a = (aij ) ∈ Glk (R), X ∈ Tx M , u = (v1 , . . , vk ) ∈ Glx (E) and let σ := (σ1 , . . , σk ) be a local section of Gl(E) satisfying σ(x) = u and (∇X σi )x = 0. Then σa is a local section of Gl(E) with (σa)(x) = ua and its components (σa)i = j aji σj satisfy ∇X (σa)i = 0 at x because ∇ is R-linear. We thus have ˜ u ) = (Ra )∗ (σ∗ (X)) = (Rα ◦ σ)∗ (X) = (σa)∗ (X) = X ˜ ua . (Ra )∗ (X 40 5. 5. Let P be a G-principal bundle over a manifold M with vertical distribution (tangent to the fibres) denoted by V.