A non-equilibrium effective temperature of quantum vortex tangles is defined as the average energy of closed vortex loops. The resulting thermodynamic expressions for the entropy and the energy in terms of the temperature of the tangle are confirmed by a microscopic analysis based on a potential distribution function for the length of vortex loops. Furthermore, these expressions for the entropy and energy in terms of temperature are analogous to those of black holes: this may be of interest for establishing further connections between topological defects in superfluids and cosmology. © 2009 Elsevier B.V. All rights reserved.
|Journal||Physics Letters, Section A: General, Atomic and Solid State Physics|
|Publication status||Published - 22 Jun 2009|
- Fractal dimension
- Non-equilibrium thermodynamics
- Superfluid turbulence