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14 papers · 1 filter
Instabilities and the roton spectrum of a quasi-1D Bose-Einstein condensed gas with dipole-dipole interactions
Stefano Giovanazzi, Duncan H J O'Dell
We point out the possibility of having a roton-type excitation spectrum in a quasi-1D Bose-Einstein condensate with dipole-dipole interactions. Normally such a system is quite unst…
Giant Relaxation Oscillations in a Very Strongly Hysteretic SQUID ring-Tank Circuit System
T. D. Clark, R. J. Prance, R. Whiteman +4
In this paper we show that the radio frequency (rf) dynamical characteristics of a very strongly hysteretic SQUID ring, coupled to an rf tank circuit resonator, display relaxation…
Pinch Resonances in a Radio Frequency Driven SQUID Ring-Resonator System
H. Prance, T. D. Clark, R. Whiteman +4
In this paper we present experimental data on the frequency domain response of a SQUID ring (a Josephson weak link enclosed by a thick superconducting ring) coupled to a radio freq…
Quantum Statistics and Entanglement of Two Electromagnetic Field Modes Coupled via a Mesoscopic SQUID Ring
M. J. Everitt, T. D. Clark, P. Stiffell +4
In this paper we investigate the behaviour of a fully quantum mechanical system consisting of a mesoscopic SQUID ring coupled to one or two electromagnetic field modes. We show tha…
A Fully Quantum Mechanical Model of a SQUID Ring Coupled to an Electromagnetic Field
M. J. Everitt, P. B. Stiffell, T. D. Clark +4
A quantum system comprising of a monochromatic electromagnetic field coupled to a SQUID ring with sinusoidal non-linearity, is studied. A magnetostatic flux is also threadi…
Non-Gaussianity in braneworld and tachyon inflation
Gianluca Calcagni
We calculate the bispectrum of single-field braneworld inflation, triggered by either an ordinary scalar field or a cosmological tachyon, by means of a gradient expansion of large-…