4D Anomalous U(1)'s, their masses and their relation to 6D anomalies
P. Anastasopoulos
Abstract
In some four-dimensional orientifolds, U(1) gauge fields that are free of four-dimensional anomalies can still be massive. It is shown that this is due to mass-generating six-dimensional anomalies. Six-dimensional anomalies affect four-dimensional masses via decompactifications.
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