Born–Infeld electrodynamics is named after physicists Max Born and Leopold Infeld, who first proposed it. The model possesses a whole series of physically interesting properties.
In analogy to a relativistic limit on velocity, Born–Infeld theory proposes a limiting force via limited electric field strength. A maximum electric field strength produces a finite electric field self-energy, which when attributed entirely to electron mass-produces maximum field [1]
Born–Infeld electrodynamics displays good physical properties concerning wave propagation, such as the absence of shock waves and birefringence. A field theory showing this property is usually called completely exceptional, and Born–Infeld theory is the only [7] completely exceptional regularnonlinear electrodynamics.
This theory can be seen as a covariant generalization of Mie's theory and very close to Albert Einstein's idea of introducing a nonsymmetric metric tensor with the symmetric part corresponding to the usual metric tensor and the antisymmetric to the electromagnetic field tensor.
The compatibility of Born–Infeld theory with high-precision atomic experimental data requires a value of a limiting field some 200 times higher than that introduced in the original formulation of the theory.[8]
Since 1985 there was a revival of interest on Born–Infeld theory and its nonabelian extensions, as they were found in some limits of string theory. It was discovered by E.S. Fradkin and A.A. Tseytlin[9] that the Born–Infeld action is the leading term in the low-energy effective action of the open string theory expanded in powers of derivatives of gauge field strength.
Equations
We will use the relativistic notation here, as this theory is fully relativistic.
where η is the Minkowski metric, F is the Faraday tensor (both are treated as square matrices, so that we can take the determinant of their sum), and b is a scale parameter. The maximal possible value of the electric field in this theory is b, and the self-energy of point charges is finite. For electric and magnetic fields much smaller than b, the theory reduces to Maxwell electrodynamics.
In 4-dimensional spacetime the Lagrangian can be written as
where E is the electric field, and B is the magnetic field.
In string theory, gauge fields on a D-brane (that arise from attached open strings) are described by the same type of Lagrangian:
^Liu, Chien-Hao; Yau, Shing-Tung (2016-06-28). "Dynamics of D-branes I. The non-Abelian Dirac-Born-Infeld action, its first variation, and the equations of motion for D-branes --- with remarks on the non-Abelian Chern-Simons/Wess-Zumino term". arXiv:1606.08529 [hep-th].
^Bialynicki-Birula, I (1983). "3. Nonlinear Electrodynamics: Variations on a Theme by Born and Infield". In Jancewicz, B.; Lukierski, J. (eds.). Quantum Theory of Particles and Fields: Festschrift of J. Lopuszanski. World Scientific. pp. 31–42. ISBN9971-950-77-4. OCLC610059703.