The neutron star crust, the 1 kilometer region on the surface composed of nuclei and superfluid neutrons, is the physical location of the majority of the phenomena observed in neutron stars. The composition of the crust is a fundamental input for the evolution of isolated and accreting neutron stars, and is important for the description of rp-process nucleosynthesis, gravitational waves generat...

Superfluid helium consists of two inter-penetrating fluids, a viscous normal fluid and an inviscid superfluid, coupled by a mutual friction. We develop a two-fluid shell model to study superfluid turbulence and investigate the energy spectra and the balance of fluxes between the two fluids in a steady state. At sufficiently low temperatures a ’bottle-neck’ develops at high wavenumbers suggestin...

We discuss the nature of the various modes of pulsation of superfluid neutron stars using comparatively simple Newtonian models and the Cowling approximation. The matter in these stars is described in terms of a two-fluid model, where one fluid is the neutron superfluid, which is believed to exist in the core and inner crust of mature neutron stars, and the other fluid represents a conglomerate...

In three dimensions the two-component vector model is the simplest spin model in the universality class of the superfluid λ transition of He, and of the ferromagnetic transition of magnets with an easy magnetization plane[ [1]]. No high temperature (HT) series studies of this model have appeared in the last two decades in spite of remarkable experimental measurements of the critical parameters ...

We study the superfluid dynamics of outer core neutron stars by means a generalized hydrodynamic model made neutronic and protonic superconductor, coupled both dynamic entrainment Skyrme SLy4 nucleon-nucleon interactions. The resulting nonlinear equations motion are probed in search for dynamical instabilities triggered relative superfluids that could be potential relevance to observational fea...

A microscopic statistical model of a quantum solid is developed, where inside crystalline lattice there can exist regions disorder, such as dislocation networks or grain boundaries. The cores these disorder are allowed for exhibiting fluid-like properties. If the composed Bose atoms, then aggregations exhibit Bose-Einstein condensation and hence superfluidity. randomly distributed throughout sa...

We present the first study of the phase diagram of a thick film of superfluid He confined within a nanofabricated slab geometry. This cryogenic microfluidic chamber provides a well-defined environment for the superfluid, in which both the regular geometry and surface roughness may be fully characterised. The chamber is designed with a slab thickness d = 0.6 μm and 3 mm thick walls to allow pres...

We study the zero-temperature phase transition of a two-dimensional disordered boson Hubbard model. The phase diagram is constructed in terms of the disorder strength and the chemical potential. Via Monte Carlo simulations, we find a multicritical line separating the weak-disorder regime, where the Mott-insulator-to-superfluid transition occurs, from the strong-disorder regime, where the Bose-g...