Speaker
Pablo Camara
(CERN)
Description
Type II string compactifications to 4d generically contain
massless Ramond-Ramond U(1) gauge symmetries. I will discuss
in detail different avenues by which U(1)_RR bosons may mix
with D-brane U(1)'s. The focus will be mostly on Type IIA
orientifolds and their M-theory lift, although
phenomenological consequences in the context of hypercharge
gauge coupling unification in F-theory SU(5) GUT's will also
be discussed.
