This brief document is a response to the call for ideas for CFHT imaging surveys with MEGACAM. We have been carrying out wide eld, deep imaging at the CFHT for several years now, with the primary science goal of using weak lensing of faint galaxies to probe the dark matter distribution on a range of scales from galaxy halos through galaxy cluster scales to supercluster scales. Thus far we have ...

The operational approach to the measurement of phase studied by Noh, Fougerès and Mandel is applied to the measurement of the state of polarization of fully polarized light. Operational counterparts of the quantum Stokes parameters are introduced and their fluctuations are examined. It is shown that, if the polarized field is weak, the measured fluctuations are influenced not only by the quantu...

Choice functions on tournaments always select the maximal element (Condorcet winner), provided they exist, but this property does not hold in the more general case of weak tournaments. In this paper we analyze the relationship between the usual choice functions and the set of maximal elements in weak tournaments. We introduce choice functions selecting maximal elements, whenever they exist. Mor...

Some time ago, we found that the weak-field magnetoresistance in /)-type SnTe exhibits a peculiar symmetry which, moreover, lb ^ong function of both carrier density and temperature. ■ The main purpose of this paper is to describe a conceptually simple model which can account for this unusual behavior in a straightforward way. Section II is concerned with experimental details, and Sec. Ill prese...

Instabilities in snow slopes generally involve the progressive fracture along a weak snowpack layer. Recent field observations on fractures in weak layers have shown that this process results vertical displacement due to crushing of the weak layer. Long beam specimens containing a natural weak layer were used to study the propagation of fracture. Multiple black markers were inserted in the snow...

The tidal gravitational field of galaxy clusters causes a coherent distortion of the images of background sources. Since the distribution of image distortions, namely the shear field, traces the local gravitational potential of a deflector, it can be used to reconstruct the twodimensional mass distribution of clusters of galaxies. Moreover, the shear field can provide unique information on the ...

We explore a technique for decelerating molecules using a static magnetic field and optical pumping. Molecules travel through a spatially varying magnetic field and are repeatedly pumped into a weak-field seeking state as they move towards each strong field region, and into a strong-field seeking state as they move towards weak field. The method is time-independent and so is suitable for decele...

We discuss the possible existence of a superconducting phase at high magnetic field in organic quasione-dimensional conductors. We consider in particular (i) the formation of a Larkin-OvchinnikovFulde-Ferrell state, (ii) the role of a temperature-induced dimensional crossover occuring when the transverse coherence length ξz(T ) becomes of the order of the lattice spacing, and (iii) the effect o...

We investigate the behavior of the magneto-rotational instability in the limit of extremely weak magnetic field, i.e., as the ratio of ion cyclotron frequency to orbital frequency (X) becomes small. Considered only in terms of cold two-fluid theory, instability persists to arbitrarily small values of X, and the maximum growth rate is of order the orbital frequency except for the range me/mi < |...

Abstract We examine the rotation of the plane of polarization for linearly polarized light rays by the weak gravitational field of an isolated physical system. Based on the rotation of inertial frames, we review the general integral expression for the net rotation. We apply this formula, analogue to the usual electromagnetic Faraday effect, to some interesting astrophysical systems: uniformly s...