I.F.T.

Almuerzo-Seminario

(Lunch seminar)

October 19th 1999, 14:00 p.m.

Anomaly Cancellation in D=4, N=1 Orientifolds and Linear/Chiral Multiplet Duality

Matthias Klein

I.F.T./U.A.M.

It has been proposed that gauge and K"ahler anomalies in four-dimensional type IIB orientifolds are cancelled by a generalized Green-Schwarz mechanism involving exchange of twisted RR-fields. I explain how this can be understood using the well-known duality between linear and chiral multiplets. I find that all the twisted fields associated to the N=1 sectors and some of the fields associated to the N=2 sectors reside in linear multiplets. Only the linear multiplets contribute to anomaly cancellation. This suffices to cancel all U(1) anomalies. In the case of K"ahler symmetries the complete SL(2,R) can be restored at the quantum level for all planes that are not fixed by an order-two twist.

The almuerzo-seminario is intended to be an informal seminar and an open forum for discussion.

You are wellcome to bring your own bocata (sandwich), or coffee or tea.

Where: Modulo C-XVI, 3rd floor, Facultad de Ciencias U.A.M., C.U. Cantoblanco, 28049-Madrid