4,999 research outputs found
Covariant spectator theory of np scattering: Effective range expansions and relativistic deuteron wave functions
We present the effective range expansions for the 1S_0 and 3S_1 scattering
phase shifts, and the relativistic deuteron wave functions that accompany our
recent high precision fits (with chi^2/N{data} approx 1) to the 2007 world np
data below 350 MeV. The wave functions are expanded in a series of analytical
functions (with the correct asymptotic behavior at both large and small
arguments) that can be Fourier-transformed from momentum to coordinate space
and are convenient to use in any application. A fortran subroutine to compute
these wave functions can be obtained from the authors.Comment: 32 pages, 14 figure
Juggling and vector compositions
AbstractA considerable amount of interest has arisen pertaining to the mathematics of juggling. In this paper, we use techniques similar to those of Ehrenborg and Readdy (Discrete Math. 157 (1996) 107) to enumerate two special classes of juggling patterns. Both classes are enumerated by a product of q-binomial coefficients; the second class is a generalization of the first. Using the first class of patterns, we give a bijective proof of an identity of Haglund (Compositions, rook placements, and permutations of vectors, Doctoral Dissertation, University of Georgia, Athens, GA, 1993) involving vector compositions. We define a generalized vector composition and provide a bijective proof of an identity dual to Haglund's using these generalized vector compositions
Metastable States in High Order Short-Range Spin Glasses
The mean number of metastable states in higher order short-range spin
glasses is estimated analytically using a variational method introduced by
Tanaka and Edwards for very large coordination numbers. For lattices with small
connectivities, numerical simulations do not show any significant dependence on
the relative positions of the interacting spins on the lattice, indicating thus
that these systems can be described by a few macroscopic parameters. As an
extremely anisotropic model we consider the low autocorrelated binary spin
model and we show through numerical simulations that its landscape has an
exceptionally large number of local optima
Reciprocal and non-reciprocal recombination between closely linked markers
Reciprocal and non-reciprocal recombination between closely linked marker
Quantum control of electron--phonon scatterings in artificial atoms
The phonon-induced dephasing dynamics in optically excited semiconductor
quantum dots is studied within the frameworks of the independent Boson model
and optimal control. We show that appropriate tailoring of laser pulses allows
a complete control of the optical excitation despite the phonon dephasing, a
finding in marked contrast to other environment couplings.Comment: to appear in Phys. Rev. Let
Method for isolating protoperithecia
Method for isolating protoperitheci
Evidence for a single hydrogen molecule connected by an atomic chain
Stable, single-molecule conducting-bridge configurations are typically
identified from peak structures in a conductance histogram. In previous work on
Pt with H at cryogenic temperatures it has been shown that a peak near 1
identifies a single molecule Pt-H-Pt bridge. The histogram shows
an additional structure with lower conductance that has not been identified.
Here, we show that it is likely due to a hydrogen decorated Pt chain in contact
with the H molecular bridge.Comment: 4 pages, 4 figure
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