14,672 research outputs found
Work distribution of an expanding gas and transverse energy production in relativistic heavy ion collisions
The work distribution of an expanding extreme relativistic gas is shown to be
a gamma distribution with a different shape parameter as compared with its
non-relativistic counterpart. This implies that the shape of the transverse
energy distribution in relativistic heavy ion collisions depends on the
particle contents during the evolution of the hot and dense matter. Therefore,
transverse energy fluctuations provide additional insights into the Quark-Gluon
Plasma produced in these collisions.Comment: Added discussions in Section 3, improved introductions to Eqs. (4)
and (15), corrected typos, updated reference
CONSIDERATIONS FOR THE APPLICATION OF TIME-TEMPERATURE INTEGRATORS IN FOOD DISTRIBUTION
Agribusiness,
Tree-level Split Helicity Amplitudes in Ambitwistor Space
We study all tree-level split helicity gluon amplitudes by using the recently
proposed BCFW recursion relation and Hodges diagrams in ambitwistor space. We
pick out the contributing diagrams and find that all of them can be divided
into triangles in a suitable way. We give the explicit expressions for all of
these amplitudes. As an example, we reproduce the six gluon split NMHV
amplitudes in momentum space.Comment: 20 pages, 16 figures; minor changes; clarifications added, 22 pages,
16 figure
Resummation of High Order Corrections in Boson Plus Jet Production at the LHC
We study the multiple soft gluon radiation effects in boson plus jet
production at the LHC. By applying the transverse momentum dependent
factorization formalism, the large logarithms introduced by the small total
transverse momentum of the boson plus jet final state system, are resummed
to all orders in the expansion of the strong interaction coupling at the
accuracy of Next-to-Leading Logarithm(NLL). We also compare the prediction of
our resummation calculation to the CMS data by employing a reweighting
procedure to estimate the effect from imposing kinematic cuts on the leptons
from boson decay, and find good agreement for both the imbalance transverse
momentum and the azimuthal angle correlation of the final state boson and
jet system, for production at the LHC.Comment: 7 pages, published versio
Remarks on the Theory of Cosmological Perturbation
It is shown that the power spectrum defined in the Synchronous Gauge can not
be directly used to calculate the predictions of cosmological models on the
large-scale structure of universe, which should be calculated directly by a
suitable gauge-invariant power spectrum or the power spectrum defined in the
Newtonian Gauge.Comment: 13 pages, 1 figure, minor changes, to be published in Chinese Physics
Letter
Coming Closer? Tax Morale, Deterrence and Social Learning after German Unification
The paper explores whether a social learning model helps explain the observed conformity and compliance with social norms after the unification of Germany. We compare tax morale, (the willingness to pay taxes), between inhabitants of East and West Germany during the post-unification period, using three World Values Survey/European Values Survey waves between 1990 and 1999. German unification is of particular interest in analysing tax morale since it is close to a quasi-natural experiment. Factors such as a common language, similar education systems and a shared cultural and political history prior to the separation after the Second World War can be controlled because they are similar. Our findings indicate that the social learning model employed in this study helps to predict the development of tax morale over time. It is clear that tax morale values converged within a mere nine years after unification, due largely to a strong change in the level of tax morale in the East. Thus, the paper contributes to the literature that attempts to explain how norms arise, how they are maintained and how they are changed.Tax Morale, Social Learning, Conformity, Convergence Process, Deterrence, Quasi-Natural Experiment
Viscoelasticity of 2D liquids quantified in a dusty plasma experiment
The viscoelasticity of two-dimensional liquids is quantified in an experiment
using a dusty plasma. An experimental method is demonstrated for measuring the
wavenumber-dependent viscosity, , which is a quantitative indicator of
viscoelasticity. Using an expression generalized here to include friction,
is computed from the transverse current autocorrelation function
(TCAF), which is found by tracking random particle motion. The TCAF exhibits an
oscillation that is a signature of elastic contributions to viscoelasticity.
Simulations of a Yukawa liquid are consistent with the experiment.Comment: 5 pages text, 3 figures, 1 supplementary material, in press Physical
Review Letters 201
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