The spontaneous collapses of the wave functions of photons, within the framework of possible relativistic extensions of the theory of Ghirardi, Rimini, and Weber are discussed. It is shown that a recently published argument which claims that such collapses can account for the emergence of determinate outcomes of certain experiments involving fluorescent screens is inadequate, since it is based ...

We investigate the dynamics of dark-state polaritons in an atomic ensemble with ground-state degeneracy. A signal light pulse may be stored and retrieved from the atomic sample by adiabatic variation of the amplitude of a control field. During the storage process, a magnetic field causes rotation of the atomic hyperfine coherences, leading to collapses and revivals of the dark-state polariton n...

It is argued that the multifractality of higher order structure functions arises as a result of local singular instabilities (collapses) in 3D-turbulence.The modified Landau approach (with poles) is used for studying supercritical instability in this case. For the simplest situation (pole of order two), the asymptotic behavior of the structure functions is investigated. The arguments are suppor...

The class NC of problems solvable by bounded fan-in circuit families of logarithmic depth is known to be contained in logarithmic space L, but not much about the converse is known. In this paper we examine the structure of classes in between NC and L based on counting functions or, equivalently, based on arithmetic circuits. The classes PNC and C=NC, defined by a test for positivity and a test ...

A systemic perspective was employed in completing a phonological analysis and developing an intervention plan for Jarrod, a 7;0 year old child who exhibited a severe speech sound disorder characterized by inconsistency. Results of the Systemic Phonological Analysis of Child Speech (SPACS) revealed a limited sound system that was characterized by phonotactic inventory constraints, positional con...