8,750 research outputs found
Myths and Facts Regarding the Portuguese Labour Market - the Tragic Fate of College Graduates
The role of local and global strangeness neutrality at the inhomogeneous freeze-out in relativistic heavy ion collisions
The decoupling surface in relativistic heavy-ion collisions may not be
homogeneous. Rather, inhomogeneities should form when a rapid transition from
high to low entropy density occurs. We analyze the hadron "chemistry" from
high-energy heavy-ion reactions for the presence of such density
inhomogeneities. We show that due to the non-linear dependence of the particle
densities on the temperature and baryon-chemical potential such inhomogeneities
should be visible even in the integrated, inclusive abundances. We analyze
experimental data from Pb+Pb collisions at CERN-SPS and Au+Au collisions at
BNL-RHIC to determine the amplitude of inhomogeneities and the role of local
and global strangeness neutrality.Comment: 8 pages, 6 figures, To appear in proceedings of the workshop on
'Particle Correlations and Femtoscopy' September 9-11, 2006, Sao Paulo,
Brazi
Coined Quantum Walks as Quantum Markov Chains
We analyze the equivalence between discrete-time coined quantum walks and
Szegedy's quantum walks. We characterize a class of flip-flop coined models
with generalized Grover coin on a graph that can be directly converted
into Szegedy's model on the subdivision graph of and we describe a
method to convert one model into the other. This method improves previous
results in literature that need to use the staggered model and the concept of
line graph, which are avoided here.Comment: 10 pages, 4 fig
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