Generalised geometries, constrained critical points and Ramond-Ramond fields
نویسندگان
چکیده
منابع مشابه
Generalised Geometries, Constrained Critical Points and Ramond–Ramond Fields
We describe the geometry of type II string compactifications to 6– and 7–dimensional backgrounds with Ramond–Ramond–fields in terms of principal fibre bundle as generalised SU(3)– and G2– structures. We endow these structures with an integrability condition which can be characterised as a constrained critical point for the generalised Hitchin functional and provides a solution to the supersymme...
متن کاملRamond-ramond Fields, Fractional Branes and Orbifold Differential K-theory
We study D-branes and Ramond-Ramond fields on global orbifolds of Type II string theory with vanishing H-flux using methods of equivariant K-theory and K-homology. We illustrate how Bredon equivariant cohomology naturally realizes stringy orbifold cohomology. We emphasize its role as the correct cohomological tool which captures known features of the low-energy effective field theory, and which...
متن کاملSelf-Duality, Ramond-Ramond Fields, and K-Theory
Just as D-brane charge of Type IIA and Type IIB superstrings is classified, respectively, by K(X) and K(X), Ramond-Ramond fields in these theories are classified, respectively, by K(X) and K(X). By analyzing a recent proposal for how to interpret quantum self-duality of RR fields, we show that the Dirac quantization formula for the RR p-forms, when properly formulated, receives corrections that...
متن کاملRamond-Ramond Fields, Cohomology and Non-Geometric Fluxes
We consider compactifications of type II string theory in which a d-dimensional torus is fibered over a base X. In string theory, the transition functions of this fibration need not be simply diffeomorphisms of T d but can involve elements of the T-duality group Spin(d, d,Z). We precisely define the notion of a T-fold with NSNS flux. Given such a T-fold, we define the Z2-graded cohomology theor...
متن کاملRamond-Ramond Field Transformation
We find that the mixture of Ramond-Ramond fields and Neveu-Schwarz two form are transformed as Majorana spinors under the T-duality group O(d, d). The Ramond-Ramond field transformation under the group O(d, d) is realized in a simple form by using the spinor representation. The Ramond-Ramond field transformation rule obtained by Bergshoeff et al. is shown as a specific simple example. We also g...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Fortschritte der Physik
سال: 2011
ISSN: 0015-8208
DOI: 10.1002/prop.201000097