11 citations · 42 across the 16 of their papers we have counts for
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Twisted differential K-characters and D-branes
Fabio Ferrari Ruffino, Juan Carlos Rocha Barriga
We analyse in detail the language of partially non-abelian Deligne cohomology and of twisted differential K-theory, in order to describe the geometry of type II superstring backgro…
Differential K-characters and D-branes
Fabio Ferrari Ruffino
Starting from the definition of Cheeger-Simons K-character, we show how to describe D-brane world-volumes, the Wess-Zumino action and topological D-brane charges within the K-theor…
Topics on the geometry of D-brane charges and Ramond-Ramond fields - Part II: Low-degree RR fields
Fabio Ferrari Ruffino
We discuss the geometry of the Ramond-Ramond fields of low degree via the language of abelian p-gerbes, working in type II superstring theory with vanishing H-flux. A Dp-brane is a…
Freed-Witten anomaly and D-brane gauge theories
Fabio Ferrari Ruffino
We discuss the different nature of the gauge theories on a D-brane or a stack of D-branes, in type II superstring theory, as follows from the Freed-Witten anomaly. Usually on a D-b…
Classifying A-field and B-field configurations in the presence of D-branes - Part II: Stacks of D-branes
Fabio Ferrari Ruffino
In the paper arXiv:0810.4291 we have shown, in the context of type II superstring theory, the classification of the allowed B-field and A-field configurations in the presence of an…
Topics on the geometry of D-brane charges and Ramond-Ramond fields
Fabio Ferrari Ruffino
In this paper we discuss some topics on the geometry of type II superstring backgrounds with D-branes, in particular on the geometrical meaning of the D-brane charge, the Ramond-Ra…
Classifying A-field and B-field configurations in the presence of D-branes
Loriano Bonora, Fabio Ferrari Ruffino, Raffaele Savelli
We "solve" the Freed-Witten anomaly equation, i.e., we find a geometrical classification of the B-field and A-field configurations in the presence of D-branes that are anomaly-free…
Comparing two approaches to the K-theory classification of D-branes
Fabio Ferrari Ruffino, Raffaele Savelli
We consider the two main classification methods of D-brane charges via K-theory, in type II superstring theory with vanishing B-field: the Gysin map approach and the one based on t…