1,464 research outputs found
A Comparison of different measures for dynamical event-mean transverse momentum fluctuation
Various measures for the dynamical event-mean transverse momentum fluctuation
are compared with the real dynamical fluctuation using a Monte Carlo model. The
variance calculated from the G-moments can reproduce the dynamical variance
well, while those obtained through subtraction procedures are approximate
measures for not very low multiplicity. The Phi_pt can also serve as an
approximate measure after divided by the square root of mean multiplicity.Comment: 4 pages, 3 figure
The Influence of Multiplicity Distribution on the Erraticity Behavior of Multiparticle Production
The origin of the erraticity behaviour observed recently in the experiment is
studied in some detail. The negative-binomial distribution is used to fit the
experimental multiplicity distribution. It is shown that, with the multiplicity
distribution taken into account, the experimentally observed erraticity
behaviour can be well reproduced using a flat probability distribution. The
dependence of erraticity behaviour on the width of multiplicity distribution is
studied.Comment: 10 pages 5 postscript figure
The Influence of Multiplicity Fluctuation on the Erraticity Behaviour in High Energy Collisions
The influence of multiplicity distribution (fluctuation of multiplicity in
the event space) on the erraticity behaviour in high energy collisions is
investigated via Monte Carlo simulation and compared with the experimental
results from NA27 data. It is shown that, the erraticity phenomenon is
insensitive to the multiplicity fluctuation. When the average multiplicity is
low, this phenomenon is dominated by the statistical fluctuations also in the
case of multiplicities, fluctuating from event to event.Comment: 8 pages, 4 postscript figure
On the Scale of Visible Jets in High Energy Electron-Positron Collisions
A study of the dynamical fluctuation property of jets is carried out using
the Monte Carlo method. The results suggest that, the anisotropy of dynamical
fluctuations in the hadronic system inside jets, changes abruptly with the
variation of the cut parameter y_cut. A transition point exists, where these
fluctuations behave like those in soft hadronic collisions, i.e. being circular
in the transverse plane with respect to dynamical fluctuations.Comment: 6 pages, 2 figures, talk given at the XXX International Symposium on
Multiparticle Dynamic
High Energy Solutions to Laplacian Equations of Schr\"{o}dinger type
In this paper, we investigate nonlinear Schrdinger type equations
in under the framework of variable exponent spaces. We propose new
assumptions on the nonlinear term to yield bounded Palais-Smale sequences and
then prove the special sequences we find converge to critical points
respectively. The main arguments are based on the geometry supplied by Fountain
Theorem. Consequently, we show that the equation has a sequence of solutions
with high energies.Comment: 21 page
On the Dominance of Statistical Fluctuation in the Factorial-Moment Study of Chaos in Low Multiplicity Events of High Energy Collisions
It is shown using Monte Carlo simulation that for low multiplicity events the
single-event factorial moments are saturated by the statistical fluctuations.
The diverse of the event-space moments of single-event moments with
the diminishing of phase space scale, called ``erraticity'', observed in
experiment can readily be reproduced by a flat probability distribution with
only statistical fluctuations and therefore does not indicate the existence of
chaos as suggested. The possibility of studying chaos in high multiplicity
events using erraticity analysis is discussed.Comment: 16 pages in Latex, 4 figures in 4 separate PS file
Solutions for Neumann boundary value problems involving -Laplace operators
In this paper we study the nonlinear Neumann boundary value problem of the
following equations -\text{div}(|\nabla u|^{p_{1}(x)-2}\nabla
u)-\text{div}(|\nabla u|^{p_{2}(x)-2}\nabla
u)+|u|^{p_{1}(x)-2}u+|u|^{p_{2}(x)-2}u=\lambda f(x,u) in a bounded smooth
domain with Neumann boundary condition given by
|\nabla u|^{p_{1}(x)-2}\frac{\partial u}{\partial\nu}+|\nabla
u|^{p_{2}(x)-2}\frac{\partial u}{\partial\nu}=\mu g(x,u) on .
Under appropriate conditions on the source and boundary nonlinearities, we
obtain a number of results on existence and multiplicity of solutions by
variational methods in the framework of variable exponent Lebesgue and Sobolev
spaces.Comment: 17 pages. arXiv admin note: substantial text overlap with
arXiv:1205.185
Anisotropy of Dynamical Fluctuations as a Probe for Soft and Hard Processes in High Energy Collisions
It is shown using Lund Monte Carlo that, unlike the average properties of the
hadronic system inside jets, the anisotropy of dynamical fluctuations in these
systems changes abruptly with the variation of the cut parameter . A
transition point exists, where the dynamical fluctuations in the hadronic
system inside jet behave like those in soft hadronic collisions. Thus the
anisotropy property of the dynamical fluctuations can serve as a probe for the
soft and hard processes in high energy collisions.Comment: 9 pages with 4 figure (epsi format
Explosive synchronization transition in a ring of coupled oscillators
Explosive synchronization(ES), as one kind of abrupt dynamical transition in
nonlinearly coupled systems, is currently a subject of great interests. Given a
special frequency distribution, a mixed ES is observed in a ring of coupled
phase oscillators which transit from partial synchronization to ES with the
increment of coupling strength. The coupling weight is found to control the
size of the hysteresis region where asynchronous and synchronized states
coexist. Theoretical analysis reveals that the transition varies from the mixed
ES, to the ES and then to a continuous one with increasing coupling weight. Our
results are helpful to extend the understanding of the ES in homogenous
networks.Comment: 21 pages, 9 figure
Effects of biaxial strain on the electronic structures and band topologies of group-V elemental monolayers
Using first-principles calculations, we systematically investigate the
electronic structures and band topologies of four kinds of group-V elemental
(P, As, Sb and Bi) monolayers with buckled honeycomb structure. It is found
that all these monolayers can change from semiconducting to semimetallic under
compressive strain. If a tensile strain is however applied, the P, As and Sb
monolayers undergo phase transition from topologically trivial to non-trivial
regime, whereas the topological insulating nature of Bi monolayer remains
unchanged. With tunability of the band gaps and band topologies, it can be
expected that these elemental monolayers could be promising candidates for
future optoelectronic and spintronic applications
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