Abstract:

Bandos-Lechner-Sorokin-Townsend electrodynamics is a two-parameter extension of Maxwell electrodynamics. It unifies Born-Infeld and ModMax theories and satisfies electromagnetic duality. In this new electrodynamic theory, the dispersion relation of electromagnetic waves is examined in the presence of a strong magnetic background field. Based on this, thermodynamic quantities, such as the energy density and pressure of the photon gas, are calculated. It is discovered that the BLST theory provides a modification to the blackbody radiation spectrum, particularly to Stefan-Boltzmann law. As the dispersion relations are dependent on the direction of the background magnetic field, the blackbody radiation power is a function of the angle between the area element direction and background magnetic field direction.

Key words: nonlinear electrodynamics, thermodynamics, blackbody radiation