I don’t know if any of the following is valid but there are some ideas floating around about relativistic effects in casimir cavities and the Oppenheimer-Phillips effect making fusion possible:
http://www.mail-archive.com/vortex-l@eskimo.com/msg39377.html
http://www.scienceagogo.com/forum/ubbthreads.php?ubb=showflat&Number=32373
http://www.advancedphysics.org/forum/showthread.php?t=12992
