17,942 research outputs found
Jamming transitions and avalanches in the game of Dots-and-Boxes
We study the game of Dots-and-Boxes from a statistical point of view. The
early game can be treated as a case of Random Sequential Adsorption, with a
jamming transition that marks the beginning of the end-game. We derive set of
differential equations to make predictions about the state of the lattice at
the transition, and thus about the distribution of avalanches in the end-game.Comment: 7 pages, 8 figures, revtex
Hadronic photon interactions at high energies
A simple phenomenological introduction to the physics of multi-pomeron
exchange amplitudes in connection with the Abramovski-Gribov-Kancheli (AGK)
cutting rules is given. The AGK cutting rules are applied to obtain qualitative
and quantitative predictions on multiparticle production at high energies. On
this basis, particle production in hadron-hadron scattering, photoproduction,
and in particular the transition to deep-inelastic scattering is discussed.Comment: LaTeX, 6 pages, 6 ps-figs, sprocl.sty, talk given by R. Engel at
"XXVI International Symposium on Multiparticle Dynamics" held in Faro,
Portugal, September 199
Formulation of a method for predicting coupled convective and radiative heat transfer about a blunt body
Method for predicting coupled convective and radiative heat transfer about blunt bod
The effects of shock layer radiation and viscous coupling on the total heating rate to a reentering blunt body
Coupling radiative and convective heat transfer in hypersonic blunt body reentr
Model-independent assessment of current direct searches for spin-dependent dark matter
I evaluate the current results of spin-dependent weakly interacting massive
particle (WIMP) searches within a model-independent framework, showing the most
restrictive limits to date derive from the combination of xenon and sodium
iodide experiments. The extension of this analysis to the case of positive
signal experiments is elaborated.Comment: 4 pages, 4 figures, revised and accepted for publication on Phys.
Rev. Let
Probing the Melting of a Two-dimensional Quantum Wigner Crystal via its Screening Efficiency
One of the most fundamental and yet elusive collective phases of an
interacting electron system is the quantum Wigner crystal (WC), an ordered
array of electrons expected to form when the electrons' Coulomb repulsion
energy eclipses their kinetic (Fermi) energy. In low-disorder, two-dimensional
(2D) electron systems, the quantum WC is known to be favored at very low
temperatures () and small Landau level filling factors (), near the
termination of the fractional quantum Hall states. This WC phase exhibits an
insulating behavior, reflecting its pinning by the small but finite disorder
potential. An experimental determination of a vs phase diagram for
the melting of the WC, however, has proved to be challenging. Here we use
capacitance measurements to probe the 2D WC through its effective screening as
a function of and . We find that, as expected, the screening
efficiency of the pinned WC is very poor at very low and improves at higher
once the WC melts. Surprisingly, however, rather than monotonically
changing with increasing , the screening efficiency shows a well-defined
maximum at a which is close to the previously-reported melting temperature
of the WC. Our experimental results suggest a new method to map out a vs
phase diagram of the magnetic-field-induced WC precisely.Comment: The formal version is published on Phys. Rev. Lett. 122, 116601
(2019
Incremental Network Design with Minimum Spanning Trees
Given an edge-weighted graph and a set , the
incremental network design problem with minimum spanning trees asks for a
sequence of edges minimizing
where is the weight of a minimum spanning tree
for the subgraph and . We prove that this problem can be solved by a greedy
algorithm.Comment: 9 pages, minor revision based on reviewer comment
Intrinsic-Density Functionals
The Hohenberg-Kohn theorem and Kohn-Sham procedure are extended to
functionals of the localized intrinsic density of a self-bound system such as a
nucleus. After defining the intrinsic-density functional, we modify the usual
Kohn-Sham procedure slightly to evaluate the mean-field approximation to the
functional, and carefully describe the construction of the leading corrections
for a system of fermions in one dimension with a spin-degeneracy equal to the
number of particles N. Despite the fact that the corrections are complicated
and nonlocal, we are able to construct a local Skyrme-like intrinsic-density
functional that, while different from the exact functional, shares with it a
minimum value equal to the exact ground-state energy at the exact ground-state
intrinsic density, to next-to-leading order in 1/N. We briefly discuss
implications for real Skyrme functionals.Comment: 15 page
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