Superconductivity - a quantum phenomenon in which metals below a certain temperature develop flow of current with no loss or resistance - is one of the most exciting problems in physics. Many prominent theorists, have proposed theories for new classes of superconducting materials, followed by teams of experimentalists working to provide solid evidence for these theories. More than 100,000 research papers have been published on the new materials. One such theory began with a proposal in 1989 by Chandra Varma while at Bell Laboratories, NJ, and now a distinguished professor of physics and astronomy at the University of California, Riverside. At UC Riverside, he further developed the theory and proposed experiments to confirm or refute it. That theory has now been experimentally proven to be a consistent theory by physicists in China and Korea. http://phys.org/news/2016-03-superconductivity-theory-exclusive-experimental.html Paper: http://advances.sciencemag.org/content/2/3/e1501329.full
Talk of the reversing of time and stretching of space in theromdynamic systems, whether near absolute zero or not, seems to violate cherished ideas about the arrow of time, and about how BEC particles can share the same space at near zero. Can time really be reversed, and can space really be stretched? I think that resorting to those ideas to explain aspects of symmetry in superconductivity is "iffy", but that is a cheap shot, I admit.
The particles referred to in the phys.org article are quasi-particles not regular electrons. Quasi-particles can manifest all sorts of otherwise forbidden properties like zero mass and negative resistance. The definitions of many quasi-particles properties are frequently very different than those of regular particles. I have seen mass defined as the derivative of momentum with respect to velocity.
