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Comments on Below Absolute Zero? Gas Is Negative-Kelvin Material
'From absolute zero, just where can the temperature drop to?'- Alan E. Nourse, 1951. (Read
the complete story)
| "Here's the abstract from Schneider et al's paper:
Absolute temperature is usually bound to be positive. Under special conditions, however, negative temperatures—in which high-energy states are more occupied than low-energy states—are also possible. Such states have been demonstrated in localized systems with finite, discrete spectra. Here, we prepared a negative temperature state for motional degrees of freedom. By tailoring the Bose-Hubbard Hamiltonian, we created an attractively interacting ensemble of ultracold bosons at negative temperature that is stable against collapse for arbitrary atom numbers. The quasimomentum distribution develops sharp peaks at the upper band edge, revealing thermal equilibrium and bosonic coherence over several lattice sites. Negative temperatures imply negative pressures and open up new parameter regimes for cold atoms, enabling fundamentally new many-body states. " |
| "" the highest positive temperature possible corresponds to the most disordered state of the system. This would be an equal number of particles at every point on the landscape." Equal numbers everywhere is extremely ordered! So is the most disordered state, simultaneously, the most ordered?" (Peter jacobs 1/6/2013 3:37:44 PM) |
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