Superfluidity of the vacuum near an anisotropic singularity: a new phase transition
Grib A. A. , Mamaev S. G. , Mostepanenko V. M.
We examine a quantum scalar field with a λφ 4 interaction in an anisotropic space-time and show that for large enough anisotropy there is a phase transition leading to the formation of a condensate with energy density--1/Λί4.