We develop a computational model of quantum turbulence decay employing a kinematic prescription for the normal fluid. We find that after an initial transient, the length of the vortex tangle L decreases and for large times obeys the scaling law L ≈ t−0.45. The average magnitude (along the quantized vortices) of the superfluid and line-vortex velocity are close and differ significantly from the ...

We explore the equations of state and other properties of various quantum fluids (He, He, their mixtures, and H2) confined within individual carbon nanotubes. Above a threshold number of particles, Na, the fluid density near the axis begins to grow above a negligibly small value. The properties of this axial fluid phase are sensitive to the tube size and hence to the transverse compression in t...

Classical lattice gas automata effectively simulate physical processes such as diffusion and fluid flow (in certain parameter regimes) despite their simplicity at the microscale. Motivated by current interest in quantum computation we recently defined quantum lattice gas automata; in this paper we initiate a project to analyze which physical processes these models can effectively simulate. Stud...

We investigate the cross interactions in a two-component polariton quantum fluid coherently driven by two independent pumping lasers tuned at different energies and momenta. We show that both the hysteresis cycles and the on-off threshold of one polariton signal can be entirely controlled by a second polariton fluid. Furthermore, we study the ultrafast switching dynamics of a driven polariton s...

We study cosmological density fluctuations within a covariant and gaugeinvariant fluid-flow approach for a perfect fluid in the Einstein-Cartan gravity and derive the corresponding Raychaudhuri type of inhomogeneous coupled differential evolution equations of the second order. It appears that the quantum fluctuations of spin trigger primordial density inhomogeneities at the scale of weak intera...

Recently, Glass and Krisch have extended the Vaidya radiating metric to include both a radiation fluid and a string fluid (1999 Class. Quantum Grav. 16 1175). Mass diffusion in the extended Schwarzschild atmosphere was studied. The continuous solutions of classical diffusive transport are believed to describe the envelope of the underlying fractal behaviour. In this work we examine the classica...

Multivortex dynamics in Manton's Schrödinger–Chern–Simons variant of the Landau– Ginzburg model of thin superconductors is studied within a moduli space approximation. It is shown that the reduced flow on M N , the N vortex moduli space, is hamiltonian with respect to ω L 2 , the L 2 Kähler form on M N. A purely hamiltonian discussion of the conserved momenta associated with the euclidean symme...

In this paper we discuss the interplay of quantum fluctuations and dissipation in uniform superconducting nanowires. We consider a phenomenological model with superconducting and normal components and a finite equilibration rate between these two fluids. We find that phase-slip dipoles proliferate in the wire and decouple the two fluids within its bulk. This implies that the normal fluid only c...