4 research outputs found
Thermodynamics of a Photon Gas in Nonlinear Electrodynamics
In this paper we analyze the thermodynamic properties of a photon gas under
the influence of a background electromagnetic field in the context of any
nonlinear electrodynamics. Neglecting the self-interaction of photons, we
obtain a general expression for the grand canonical potential. Particularizing
for the case when the background field is uniform, we determine the pressure
and the energy density for the photon gas. Although the pressure and the energy
density change when compared with the standard case, the relationship between
them remains unaltered, namely . Finally, we apply the developed
formulation to the cases of Heisenberg-Euler and Born-Infeld nonlinear
electrodynamics. For the Heisenberg-Euler case, we show that our formalism
recover the results obtained with the -loop thermal effective action
approach.Comment: 7 pages, 1 figures. A new section about H.E. effective action added
in this version. Accepted PL
Constraining Born-Infeld-like Nonlinear Electrodynamics Using Hydrogen's Ionization Energy
In this work, the hydrogen's ionization energy was used to constrain the free
parameter of three Born-Infeld-like electrodynamics namely Born-Infeld
itself, Logarithmic electrodynamics and Exponential electrodynamics. An
analytical methodology capable of calculating the hydrogen ground state energy
level correction for a generic nonlinear electrodynamics was developed. Using
the experimental uncertainty in the ground state energy of the hydrogen atom,
the bound , where , and
for the Born-Infeld, Logarithmic and Exponential electrodynamics
respectively, was established. In the particular case of Born-Infeld
electrodynamics, the constraint found for was compared with other
constraints present in the literature.Comment: 9 pages, 1 figure, references adde