6,817 research outputs found
Phenomenology of the Baryon Resonance 70-plet at Large N_c
We examine the multiplet structure and decay channels of baryon resonances in
the large N_c QCD generalization of the N_c = 3 SU(6) spin-flavor 70. We show
that this ``70'', while a construct of large N_c quark models, actually
consists of five model-independent irreducible spin-flavor multiplets in the
large N_c limit. The preferred decay modes for these resonances fundamentally
depend upon which of the five multiplets to which the resonance belongs. For
example, there exists an SU(3) ``8'' of resonances that is eta-philic and
pi-phobic, and an ``8'' that is the reverse. Moreover, resonances with a strong
SU(3) ``1'' component prefer to decay via a K-bar rather than via a pi.
Remarkably, available data appears to bear out these conclusions.Comment: 26 pages, ReVTe
Coherence properties of infrared thermal emission from heated metallic nanowires
Coherence properties of the infrared thermal radiation from individual heated
nanowires are investigated as function of nanowire dimensions. Interfering the
thermally induced radiation from a heated nanowire with its image in a nearby
moveable mirror, well-defined fringes are observed. From the fringe visibility,
the coherence length of the thermal emission radiation from the narrowest
nanowires was estimated to be at least 20 um which is much larger than expected
from a classical blackbody radiator. A significant increase in coherence and
emission efficiency is observed for smaller nanowires.Comment: 4 pages,figures include
Asynchronous operation of round rotor synchronous machines
After a generating unit loses synchronism, it is usually disconnected from the system. However, tests have shown that if an unsynchronized round rotor machine is left connected to the system, its speed will increase to some steady state asynchronous value at which the electrical power output of the machine is equal to the turbine mechanical power input. The machine output is due to induced eddy currents in the rotor surface causing the unit to act as an induction generator
SU(3) quasidynamical symmetry underlying the Alhassid--Whelan arc of regularity
The first example of an empirically manifested quasi dynamical symmetry
trajectory in the interior of the symmetry triangle of the Interacting Boson
Approximation model is identified for large boson numbers. Along this curve,
extending from SU(3) to near the critical line of the first order phase
transition, spectra exhibit nearly the same degeneracies that characterize the
low energy levels of SU(3). This trajectory also lies close to the
Alhassid-Whelan arc of regularity, the unique interior region of regular
behavior connecting the SU(3) and U(5) vertices, thus offering a possible
symmetry-based interpretation of that narrow zone of regularity amidst regions
of more chaotic spectra.Comment: 4 pages, LaTeX, 5 eps figure
Detailed analysis of quantum phase transitions within the algebra
We analyze in detail the quantum phase transitions that arise in models based
on the algebraic description for bosonic systems with two types of
scalar bosons. First we discuss the quantum phase transition that occurs in
hamiltonians that admix the two dynamical symmetry chains
and by diagonalizing the problem exactly in the
basis. Then we apply the coherent state formalism to determine the energy
functional. Finally we show that a quantum phase transition of a different
nature, but displaying similar characteristics, may arise also within a single
chain just by including higher order terms in the hamiltonian.Comment: 5 figure
Amplitude control of quantum interference
Usually, the oscillations of interference effects are controlled by relative
phases. We show that varying the amplitudes of quantum waves, for instance by
changing the reflectivity of beam splitters, can also lead to quantum
oscillations and even to Bell violations of local realism. We first study
theoretically a generalization of the Hong-Ou-Mandel experiment to arbitrary
source numbers and beam splitter transmittivity. We then consider a Bell type
experiment with two independent sources, and find strong violations of local
realism for arbitrarily large source number ; for small , one operator
measures essentially the relative phase of the sources and the other their
intensities. Since, experimentally, one can measure the parity of the number of
atoms in an optical lattice more easily than the number itself, we assume that
the detectors measure parity.Comment: 4 pages; 4 figure
Phasor analysis of atom diffraction from a rotated material grating
The strength of an atom-surface interaction is determined by studying atom
diffraction from a rotated material grating. A phasor diagram is developed to
interpret why diffraction orders are never completely suppressed when a complex
transmission function due to the van der Waals interaction is present. We also
show that atom-surface interactions can produce asymmetric diffraction
patterns. Our conceptual discussion is supported by experimental observations
with a sodium atom beam.Comment: 5 pages, 6 figures, submitted to PR
Image Storage in Hot Vapors
We theoretically investigate image propagation and storage in hot atomic
vapor. A system is adopted for imaging and an atomic vapor cell is placed
over the transform plane. The Fraunhofer diffraction pattern of an object in
the object plane can thus be transformed into atomic Raman coherence according
to the idea of ``light storage''. We investigate how the stored diffraction
pattern evolves under diffusion. Our result indicates, under appropriate
conditions, that an image can be reconstructed with high fidelity. The main
reason for this procedure to work is the fact that diffusion of opposite-phase
components of the diffraction pattern interfere destructively.Comment: 11 pages, 3 figure
Refractive index of a transparent liquid measured with a concave mirror
This paper describes the spherical concave mirror method for measuring the
index of refraction of transparent liquids. We derived the refractive index
equation using Snell's law and the small-angle approximation. We also verified
the validity of this method using the traditional spherical mirror and
thin-lens Gaussian equations.Comment: IOPart, 8 pages, 4 figure
- …