منابع مشابه
Doubled Geometry and T-Folds
The doubled formulation of string theory, which is T-duality covariant and enlarges spacetime with extra coordinates conjugate to winding number, is reformulated and its geometric and topological features examined. It is used to formulate string theory in T-fold backgrounds with T-duality transition functions and a quantum implementation of the constraints of the doubled formalism is presented....
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We study some symplectic geometric aspects of rationally connected 4-folds. As a corollary, we prove that any smooth projective 4-fold symplectic deformation equivalent to a Fano 4-fold of pseudo-index at least 2 or a rationally connected 4-fold whose second Betti number is 2 is rationally connected.
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The first condition tells that ω is of type (1, 1). The last condition is called the taming condition. We will consider more generally taming symplectic forms α on X. These forms are thus non necessarily of type (1, 1) but their (1, 1)-part is positive (but not necessarily closed). Let X and Y be two complex projective or compact Kähler manifolds. The set of taming symplectic forms on X, resp. ...
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The original recursions for A2(d) ≡ nd(ψ̃, H) and B1(d1, d2) ≡ nd1d2(|;H2) do not involve any of the other terms. Using Lemma 1, the formulas (A.2) and (A.3) can be shown to satisfy the two recursions. The original formula for A1(d) ≡ nd(ψ̃H) expresses A1(d) in terms of B1(d1, d2). The formula (A.1) follows from (A.3) and Lemma 2. Originally, there are also the terms nd(ψ̃H,H ), but it is not hard...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2007
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2007/07/080