Is there a maximum magnetic field in QED?
Abstract
It was recently conjectured by Shabad and Usov that there exists in QED a maximum magnetic field of 10^{} G, above which the magnetized vacuum becomes unstable. Using a nonperturbative analysis that consistently incorporates the effective electron mass and the screening effect in a strong magnetic field, we show that the conjectured phenomenon of positronium collapse never takes place. Thus, there does not exist a maximum magnetic field in QED and the magnetized vacuum is stable for all values of the magnetic field.
 Publication:

Physics Letters B
 Pub Date:
 April 2009
 DOI:
 10.1016/j.physletb.2009.03.039
 arXiv:
 arXiv:0901.3413
 Bibcode:
 2009PhLB..674..344L
 Keywords:

 High Energy Physics  Theory;
 Astrophysics  High Energy Astrophysical Phenomena;
 High Energy Physics  Phenomenology
 EPrint:
 5 pages, 2 figures, to appear in Phys. Lett. B