3,085 research outputs found
Combinatorial aspect of fashion
Simulations are performed according to the Axelrod model of culture
dissemination, with modified mechanism of repulsion. Previously, repulsion was
considered by Radillo-Diaz et al (Phys. Rev. E 80 (2009) 066107) as dependent
on a predefined threshold. Here the probabilities of attraction and repulsion
are calculated from the number of cells in the same states. We also investigate
the influence of some homogeneity, introduced to the initial state. As the
result of the probabilistic definition of repulsion, the ordered state
vanishes. A small cluster of a few percent of population is retained only if in
the initial state a set of agents is prepared in the same state. We conclude
that the modelled imitation is successful only with respect to agents, and not
only their features
Heavy context dependence---decisions of underground soldiers
An attempt is made to simulate the disclosure of underground soldiers in
terms of theory of networks. The coupling mechanism between the network nodes
is the possibility that a disclosed soldier is going to disclose also his
acquaintances. We calculate the fraction of disclosed soldiers as dependent on
the fraction of those who, once disclosed, reveal also their colleagues. The
simulation is immersed in the historical context of the Polish Home Army under
the communist rule in 1946-49.Comment: 7 pages, 5 figures, for the European Conference on Modelling and
Simulation (ECMS 2015
Situations in traffic - how quickly they change
Spatio-temporal correlations of intensity of traffic are analysed for one
week data collected in the motorway M-30 around Madrid in January 2009. We
found that the lifetime of these correlations is the shortest in the evening,
between 6 and 8 p.m. This lifetime is a new indicator how much attention of
drivers is demanded in given traffic conditions.Comment: 9 pages, 6 figure
If others jump to the queue front, how long I will wait?
Two models of a queue are proposed: a human queue and two lines of vehicles
before a narrowing. In both models, a queuer tries to evaluate his waiting
time, taking into account the delay caused by intruders who jump to the queue
front. As the collected statistics of such events is very limited, the
evaluation can give very long times. The results provide an example, when
direct observations should be supplemented by an inference from the context.Comment: 4 pages, 3 figure
Evolution of Universe to the present inert phase
We assume that current state of the Universe can be described by the Inert
Doublet Model, containing two scalar doublets, one of which is responsible for
EWSB and masses of particles and the second one having no couplings to fermions
and being responsible for dark matter. We consider possible evolutions of the
Universe to this state during cooling down of the Universe after inflation. We
found that in the past Universe could pass through phase states having no DM
candidate. In the evolution via such states in addition to a possible EWSB
phase transition (2-nd order) the Universe sustained one 1-st order phase
transition or two phase transitions of the 2-nd order.Comment: 19 pages, 3 figure
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