1 | In this article we use “superfluid” to refer to any system which has the ability to flow without friction. In this sense, superfluids and superconductors are viewed in the same way. When we wish to distinguish charge carrying fluids, we will call them superconductors. | |
2 | There are three space and one time dimensions that form a type of topological space known as a manifold [114![]() |
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3 | We say “combined” here because the First Law is a statement about heat and work, and says nothing about the entropy,
which enters through the Second Law. Heat is not strictly equal to ![]() |
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4 | It is worth pointing out that we are restricting the problem somewhat by imposing particle conservation already from the outset. As we will see later, one can make good progress on less constrained problems, e.g. related to dissipation, using a slightly extended variational approach (inspired by the point particle example of Section 7). However, we feel that it is useful to first understand the details of the simpler, fully conservative, situation. | |
5 | It is important to note the difference between the vorticity formed from the momentum and the corresponding quantity
in terms of the velocity. They differ because of the entrainment, and one can show that while the former is
conserved along the flow, the latter is not. To avoid confusion we refer to ![]() ![]() |
http://www.livingreviews.org/lrr-2007-1 | ![]() This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.0 Germany License. Problems/comments to |