23,249 research outputs found
Charged Multiplicities at SPS and RHIC and consequences for suppression
Hadron multiplicities in nucleus--nucleus interactions are calculated in the
Dual Parton Model and its dependence on the number of collisions and the number
of participants is analyzed. Shadowing corrections are calculated as a function
of impact parameter and the multiplicity per participant as a funtion of
centrality is found to be in agreement with experiment at SPS and RHIC
energies. The obtained results are used to compute the suppression in
a comover approach.Comment: 4 pages, 4 postscript figures. Talk given at XXXVI Rencontres de
Moriond, Les Arcs, France, March 200
Baryon and Antibaryon production at RHIC energies in the Dual Parton Model
We compute the mid-rapidity densities of pions, kaons, baryons and
antibaryons in -- collisions at = 130 GeV in the Dual Parton
Model supplemented with final state interactions, and we present a comparison
with available data.Comment: 4 pages, 2 figures. Talk given at XXXVII Rencontres de Moriond, Les
Arcs, France, March 200
Fiscal Policy Discretion, Private Spending, and Crisis Episodes
In this paper, we assess the impact of fiscal policy discretion on economic activity in the short and medium-term. Using a panel of 132 countries from 1960 to 2008, we find that fiscal policy discretion provides a net stimulus to the economy in the short-run and crowding-in effects are amplified once crisis episodes are controlled for– in particular, banking crises - giving a great scope for fiscal policy stimulus packages. However, crowding-out effects take over in the long-run – especially, in the case of debt crises -, in line with the concerns about long-term debt sustainability.Fiscal policy discretion, GDP growth, private consumption, private investment, crowding-in, crowding-out.
Applications and Sexual Version of a Simple Model for Biological Ageing
We use a simple model for biological ageing to study the mortality of the
population, obtaining a good agreement with the Gompertz law. We also simulate
the same model on a square lattice, considering different strategies of
parental care. The results are in agreement with those obtained earlier with
the more complicated Penna model for biological ageing. Finally, we present the
sexual version of this simple model.Comment: For Int.J.Mod.Phys.C Dec. 2001; 11 pages including 6 fig
Monte Carlo model for nuclear collisions from SPS to LHC energies
A Monte Carlo model to simulate nuclear collisions in the energy range going
from SPS to LHC, is presented. The model includes in its initial stage both
soft and semihard components, which lead to the formation of color strings.
Collectivity is taken into account considering the possibility of strings in
color representations higher than triplet or antitriplet, by means of string
fusion. String breaking leads to the production of secondaries. At this point,
the model can be used as initial condition for further evolution by a transport
model. In order to tune the parameters and see the results in nucleus-nucleus
collisions, a naif model for rescattering of secondaries is introduced. Results
of the model are compared with experimental data, and predictions for RHIC and
LHC are shown.Comment: LaTeX, 48 pages, 6 tables, 15 postscript figures included using
epsfi
Space-time Torsion and Neutrino Oscillations in Vacuum
The objective of this study is to verify the consistency of the prescription
of alternative minimum coupling (connection) proposed by the Teleparallel
Equivalent to General Relativity (TEGR) for the Dirac equation. With this aim,
we studied the problem of neutrino oscillations in Weitzenbock space-time in
the Schwarzschild metric. In particular, we calculate the phase dynamics of
neutrinos. The relation of spin of the neutrino with the space-time torsion is
clarified through the determination of the phase differences between spin
eigenstates of the neutrinos.Comment: 07 pages, no figure
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