Interaction of Electromagnetic Radiation with Supercritical Magnetic Field
Abstract
Description
It is pointed, that effects of refraction of electromagnetic radiation in the medium, formed by the magnetized vacuum, become essential already for relatively soft photons, not hard enough to create an electron-positron pair, including those belonging to soft gamma-, X-ray, optic and radio- range, if the magnetic field B exceeds the critical value of Bcr=m^2/e=4.4 10^13 Gauss. Three leading terms in the asymptotic expansion of the one-loop polarization operator in a constant magnetic field are found for B>>Bcr, and the corresponding refraction index is shown to depend only on the propagation direction of the photon relative to the external field. It is established, that the refraction index for one of polarization modes unlimitedly grows with the field, while the other is saturated at a moderate level. The photon capture effect is extended to soft photons. The results may be essential in studying reflection, refraction and splitting of X-rays, light and radio waves by magnetic fields of magnetars, as well as in considering emission of such waves by charged particles .
21 pages, 1 figure; Latex needs ws-p8-50x6-00.cls. Extended version of the talk, given in the Workshop on Strong Magnetic Fields and Neutron Stars Havana, April 6-13, 2003 Abstract reworded to better reflect the contents, a miswriting corrected in Eq.(48) of Appendix, a statement concerning Cherenkov effect made more precise, other minor amendments
21 pages, 1 figure; Latex needs ws-p8-50x6-00.cls. Extended version of the talk, given in the Workshop on Strong Magnetic Fields and Neutron Stars Havana, April 6-13, 2003 Abstract reworded to better reflect the contents, a miswriting corrected in Eq.(48) of Appendix, a statement concerning Cherenkov effect made more precise, other minor amendments