Abstract
Soft Gamma Repeaters (SGR) and Anomalous X-Ray Pulsars (AXP) are considered by a large fraction of the scientific community as magnetars: neutron stars having a huge magnetic field (10^13 to 10^15 G). However, because of this giant magnetic field, greater than the critical limit imposed by the quantum mechanics, other possibilities are also studied: the white-dwarf model is one of them. I…