Confronting the inverse seesaw mechanism with the recent muon g-2 result

The inverse seesaw mechanism has been claimed to be consistent with existing bounds while accommodating the muon anomalous magnetic moment (g-2). We revisit this idea and review the importance of nonunitarity bounds over the inverse seesaw mechanism, either in the canonical version or when it is embedded in extended gauge theories. We show that, when nonunitarity constraints are brought into place, the inverse seesaw mechanism fails to accommodate the g-2 anomaly.