Magnetar Giant Flare Energetics Against the Density Ceiling

This paper audits the energetics of the 2004 giant flare of SGR 1806-20 against the magnetic energy reservoir of its neutron star and against the energy-density ceiling of a bounced cosmology, computing the fraction of the reservoir the flare consumed and the field strength at which magnetic energy would approach the ceiling. The headline results are as follows. Peak luminosity of the 2004 giant flare spike: 1e+47 erg s-1; Energy density if the flare energy filled a 10 km sphere: 4.77e+26 J m-3; Total magnetic energy stored in a 10 km volume at two times ten to the fifteenth gauss: 6.67e+47 erg; Fraction of the stored magnetic energy released in the giant flare: 0.03; Ratio of flare energy density to the ceiling energy density: 5.47e-49; Magnetic field at which magnetic energy density would reach one percent of the ceiling: 4.69e+37 G. All values are computed from the stated assumptions and published inputs; the study is simulated and computed, not measured.