We present a detailed study of the hydrodynamical interactions in a Newtonian black hole–neutron star binary during the last stages of inspiral. We consider close binaries which are tidally locked, use a stiff equation of state (with an adiabatic index Γ = 3) throughout, and explore the effect of different initial mass ratios on the evolution of the system. We calculate the gravitational radiat...

In this paper, we consider large non-Gaussianity generated after D-term inflation in the case that the adiabatic curvature perturbation produced is dominated by a right-handed (RH) sneutrino curvaton. The cosmic string problem can also be evaded with around 10% contribution to the CMB power spectrum and the spectral index ns ≃ 1. The non-Gaussianity produced can be as large as 10 < fNL < 100 fo...

The atomic recombination process leads to a softening of the matter equation of state as reflected by a reduced generalized adiabatic index, with accompanying heat release. We study the effects of this recombination softening and reheating of the cosmic plasma on the ionization history, visibility function, Cold Dark Matter (CDM) transfer function, and the Cosmic Microwave Background (CMB) spec...

The improved data on the cosmic microwave background (CMB) anisotropy allows a better determination of the adiabaticity of the primordial perturbation. Interestingly, we find that the CMB favors a significant contribution of a primordial isocurvature mode where the entropy perturbation is positively correlated with the primordial curvature perturbation and has a large spectral index (niso ∼ 3)....

where Eel is the adiabatic electronic energy and ∆Xis = Xis−X◦ is are the 3N cartesian displacements with respect to the equilibrium X◦ is configuration, where i spans the atom indexes and s=x,y,z. This system can still be mapped on a set of 3N decoupled 1D harmonic oscillators by introducing the normal mode of vibration. We first start defining mass-weighted cartesian coordinates ua = √ mi∆Xis...

We study adiabatic mode transformations in photonic-crystal integrated circuits composed of a triangular lattice of holes etched into a planar waveguide. The taper relies on the manufacture of holes with progressively-varying dimensions. The variation synthesizes an artificial material with a gradient effective index. Calculations performed with a three-dimensional exact electromagnetic theory ...

Optical waveguide adiabatic tapers enable low-loss connections between devices with dissimilar mode profiles. Common examples are semiconductor lasers, single-mode optical fibers and planar waveguides. Planar lithographic processes can easily create tapers in the plane but out-of-plane, symmetric tapers are difficult. Three-dimensional direct-write lithography into photopolymer naturally create...

Adiabatic vacua are known to be Hadamard states. We show, however that the energy-momentum tensor of a linear Klein-Gordon field on Robertson-Walker spaces developes a generic singularity on the initial hypersurface if the adiabatic vacuum is of order less than four. Therefore, adiabatic vacua are physically reasonable only if their order is at least four. A certain non-local large momentum exp...

Adiabatic vacua are known to be Hadamard states. We show, however that the energy-momentum tensor of a linear Klein-Gordon eld on Robertson-Walker spaces developes a generic singularity on the initial hypersurface if the adiabatic vacuum is of order less than four. Therefore, adiabatic vacua are physically reasonable only if their order is at least four. A certain non-local large momentum expan...