15,706 research outputs found
Light flavor hadron spectra at low and search for collective phenomena in high multiplicity pp, p-Pb and Pb-Pb collisions measured with the ALICE experiment
Comprehensive results on transverse momentum distributions and their ratios
for identified light flavor hadrons (, K, p) at low and
mid-rapidity as a function of charged particle multiplicity are reported for pp
collisions at 7 TeV. Particle mass dependent hardening of the spectral shapes
in Pb-Pb collisions at 2.76 TeV were attributed to hydrodynamical flow and
quantitatively parameterized with Boltzmann-Gibbs Blast Wave fits. In this
contribution, we investigate the existence of collective phenomena in small
systems: pp, p-Pb and peripheral Pb-Pb where similar patterns are observed in
multiplicity dependent studies.Comment: Proceedings of Quark Matter 2014 conference, May 19-24, 201
Cost-benefit Analysis for Modernization the Agricultural Working Roads
To achieve this CBA we use a series of specific steps and process documentation and references provided by the guide in preparation for submission of projects CBA as 125/FEADR/2010. The content of the cost-benefit analysis it is described in the document developed by the European Agricultural Fund for Rural Development ”Recommendations for developing cost-benefit analysis”. For a clear image of the situation described in the project we will try to analyze three scenarios. The method used in developing the financial analysis is ” discounted cash flow ”. The chosen project is an example, but the dates and figures are real.CBA, FEADR, scenarios, financial analysis, cash flow
A construction of integrated vertex operator in the pure spinor sigma-model in AdS5xS5
Vertex operators in string theory come in two varieties: integrated and
unintegrated. Understanding both types is important for the calculation of the
string theory amplitudes. The relation between them is a descent procedure
typically involving the b-ghost. In the pure spinor formalism vertex operators
can be identified as cohomology classes of an infinite-dimensional Lie
superalgebra formed by covariant derivatives. We show that in this language the
construction of the integrated vertex from an unintegrated vertex is very
straightforward, and amounts to the evaluation of the cocycle on the
generalized Lax currents.Comment: LaTeX 13pp; v2: correction in Section 4.
fractional topological insulators in two dimensions
We propose a simple microscopic model to numerically investigate the
stability of a two dimensional fractional topological insulator (FTI). The
simplest example of a FTI consists of two decoupled copies of a Laughlin state
with opposite chiralities. We focus on bosons at half filling. We study the
stability of the FTI phase upon addition of two coupling terms of different
nature: an interspin interaction term, and an inversion symmetry breaking term
that couples the copies at the single particle level. Using exact
diagonalization and entanglement spectra, we numerically show that the FTI
phase is stable against both perturbations. We compare our system to a similar
bilayer fractional Chern insulator. We show evidence that the time reversal
invariant system survives the introduction of interaction coupling on a larger
scale than the time reversal symmetry breaking one, stressing the importance of
time reversal symmetry in the FTI phase stability. We also discuss possible
fractional phases beyond .Comment: 15 pages, 18 figure
Upper Limits on the 21 cm Power Spectrum at z = 5.9 from Quasar Absorption Line Spectroscopy
We present upper limits on the 21 cm power spectrum at calculated
from the model-independent limit on the neutral fraction of the intergalactic
medium of derived from dark
pixel statistics of quasar absorption spectra. Using 21CMMC, a Markov chain
Monte Carlo Epoch of Reionization analysis code, we explore the probability
distribution of 21 cm power spectra consistent with this constraint on the
neutral fraction. We present 99 per cent confidence upper limits of
to over a range of from 0.5 to $2.0\
h{\rm Mpc}^{-1}kz=5.9$ in excess of this value is highly suggestive of residual foreground
contamination or other systematic errors affecting the analysis.Comment: 5 pages, 1 figure, accepted to MNRAS letter
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