This seems like a farce...
Quantum gas goes below absolute zero
Ultracold atoms pave way for negative-Kelvin materials.
by Zeeya Merali, Nature News 03 January 2013, DOI: 10.1038/nature.2013.12146
I have seen several recent articles like this one and I am extremely skeptical. Perhaps my skepticism is based upon an ignorance of physical principles, but I am less offended by apparent violations of the speed of light than by considering that temperatures below absolute zero could exist. I have studied under scientists who were using advanced techniques and vast amounts of energy to get small samples cooled down to a few nanokelvin. The physics seems to imply that if a sample were to reach zero, even the nuclear forces cohering the particles would cease. This was hypothesized in hushed tones, in awe and reverence. Now this article (which seems akin to scientific blasphemy) is causing an existential crisis. What is the deal with negative absolute temperature?