2,893 research outputs found
Elliptic flow due to radiation in heavy-ion collisions
In this paper we demonstrate that radiation patterns could cause flow-like
behaviour without any reference to hydrodynamic description. For that purpose
we use a statistical ensemble of radiating dipoles, motivated by the
investigation of the equivalent photon yield produced by decelerating charges.
For the elliptic asymmetry factor we find a reasonable agreement with
experimental data.Comment: 5 pages, 5 figures, v2: discussion on the physical interpretation of
the form factor F is adde
Fiktív vallomás és szövegműködés. Dosztojevszkij: ,Ördögök’
A vallomásos elbeszélés különös világossággal mutat rá a nyelvi működés ama sajátosságára, hogy nem vonható éles határ a reprezentációs (leíró, megjelenítő) nyelvi funkció és a fikcióteremtő potencialitás között
Topological Charge Membranes in 2D and 4D Gauge Theory
Local topological charge structure in the 2D CP(N-1) sigma models is studied
using the overlap Dirac operator. Long-range coherence of topological charge
along locally 1D regions in 2D space-time is observed. We discuss the
connection between these results and the recent discovery of coherent 3D sheets
of topological charge in 4D QCD. In both cases, coherent regions of topological
charge form along surfaces of approximmate codimension 1.Comment: Lattice2004(topology
CD-independent subsets in meet-distributive lattices
A subset of a finite lattice is CD-independent if the meet of any two
incomparable elements of equals 0. In 2009, Cz\'edli, Hartmann and Schmidt
proved that any two maximal CD-independent subsets of a finite distributive
lattice have the same number of elements. In this paper, we prove that if
is a finite meet-distributive lattice, then the size of every CD-independent
subset of is at most the number of atoms of plus the length of . If,
in addition, there is no three-element antichain of meet-irreducible elements,
then we give a recursive description of maximal CD-independent subsets.
Finally, to give an application of CD-independent subsets, we give a new
approach to count islands on a rectangular board.Comment: 14 pages, 4 figure
Low-Dimensional Long-Range Topological Charge Structure in the QCD Vacuum
While sign-coherent 4-dimensional structures cannot dominate topological
charge fluctuations in the QCD vacuum at all scales due to reflection
positivity, it is possible that enhanced coherence exists over extended
space-time regions of lower dimension. Using the overlap Dirac operator to
calculate topological charge density, we present evidence for such structure in
pure-glue SU(3) lattice gauge theory. It is found that a typical equilibrium
configuration is dominated by two oppositely-charged sign-coherent connected
structures (``sheets'') covering about 80% of space-time. Each sheet is built
from elementary 3-d cubes connected through 2-d faces, and approximates a
low-dimensional curved manifold (or possibly a fractal structure) embedded in
the 4-d space. At the heart of the sheet is a ``skeleton'' formed by about 18%
of the most intense space-time points organized into a global long-range
structure, involving connected parts spreading over maximal possible distances.
We find that the skeleton is locally 1-dimensional and propose that its
geometrical properties might be relevant for understanding the possible role of
topological charge fluctuations in the physics of chiral symmetry breaking.Comment: 4 pages RevTeX, 4 figures; v2: 6 pages, 5 figures, more explanations
provided, figure and references added, published versio
Constraining Ho\v{r}ava-Lifshitz gravity by weak and strong gravitational lensing
We discuss gravitational lensing in the Kehagias-Sfetsos space-time emerging
in the framework of Ho\v{r}ava-Lifshitz gravity. In weak lensing we show that
there are three regimes, depending on the value of , where is the Ho\v{r}ava-Lifshitz parameter and
characterizes the lensing geometry. When is close to zero,
light deflection typically produces two images, as in Schwarzschild lensing.
For very large the space-time approaches flatness, therefore
there is only one undeflected image. In the intermediate range of only the upper focused image is produced due to the existence of a
maximal deflection angle , a feature inexistent in the
Schwarzschild weak lensing. We also discuss the location of Einstein rings, and
determine the range of the Ho\v{r}ava-Lifshitz parameter compatible with
present day lensing observations. Finally, we analyze in the strong lensing
regime the first two relativistic Einstein rings and determine the constraints
on the parameter range to be imposed by forthcoming experiments.Comment: 11 pages, 6 figures, introductory part and reference list changed on
referee request, results expanded. Published versio
Asymptotics of conditional empirical processes
AbstractUsing two definitions of the conditional empirical processes we obtain some approximations for these processes. We also prove the functional law of the iterated logarithm for the conditional processes. Our results say that the asymptotic behavior of the conditional and unconditional empirical processes are very similar
Ultra-low thermal conductivity in organic-inorganic hybrid perovskite CH3NH3PbI3
We report on the temperature dependence of thermal conductivity of single
crystalline and polycrystalline organometallic perovskite CH3NH3PbI3. The
comparable absolute values and temperature dependence of the two sample's
morphologies indicate the minor role of the grain boundaries on the heat
transport. Theoretical modelling demonstrates the importance of the resonant
scattering in both specimens. The interaction between phonon waves and
rotational degrees of freedom of CH3NH3+ sub-lattice emerges as the dominant
mechanism for attenuation of heat transport and for ultralow thermal
conductivity of 0.5 W/(Km) at room temperature
Hungarian acarological literature
Abstract. The Hungarian acarological literature from 1801 to 2010, excluding medical sciences (e.g. epidemiological,clinical acarology) is reviewed. Altogether 1500 articles by 437 authors are included. The publications gathered are presentedaccording to authors listed alphabetically. The layout follows the references of the paper of Horváth as appeared in the Foliaentomologica hungarica in 2004
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