KentuckyFC (1144503) writes One curious property of massless particles like photons is that their energy or momentum can take any value across many orders of magnitude, a property that physicists call scale invariance. By contrast, massive particles like electrons always have the same mass regardless of their energy or momentum. So massive particles are not scale invariant. The concept of unparticles is the idea that some "stuff" may have mass, energy and momentum and yet also be scale invariant. This stuff must be profoundly different from ordinary particles, hence the name: unparticles. Nobody has ever seen an unparticle but now physicists are suggesting that unparticles may hold the key to understanding unconventional superconductivity. Their thinking is that at very low temperatures, ordinary particles can sometimes behave like unparticles. In other words, their properties become independent of the scale at which they're observed. So if an unparticle moves without resistance on a tiny scale, then it must also move without resistance at every scale, hence the phenomenon of superconductivity. That could provide some important insights into unconventional superconductivity which has puzzled physicists since it was discovered in the 1980s.
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