12,193 research outputs found
Setting the Agenda: Different strategies of a Mass Media in a model of cultural dissemination
Day by day, people exchange opinions about a given new with relatives,
friends, and coworkers. In most cases, they get informed about a given issue by
reading newspapers, listening to the radio, or watching TV, i.e., through a
Mass Media (MM). However, the importance of a given new can be stimulated by
the Media by assigning newspaper's pages or time in TV programs. In this sense,
we say that the Media has the power to "set the agenda", i.e., it decides which
new is important and which is not. On the other hand, the Media can know
people's concerns through, for instance, websites or blogs where they express
their opinions, and then it can use this information in order to be more
appealing to an increasing number of people. In this work, we study different
scenarios in an agent-based model of cultural dissemination, in which a given
Mass Media has a specific purpose: To set a particular topic of discussion and
impose its point of view to as many social agents as it can. We model this by
making the Media has a fixed feature, representing its point of view in the
topic of discussion, while it tries to attract new consumers, by taking
advantage of feedback mechanisms, represented by adaptive features. We explore
different strategies that the Media can adopt in order to increase the affinity
with potential consumers and then the probability to be successful in imposing
this particular topic.Comment: 23 pages, 7 figure
The 2d Gross-Neveu Model at Finite Temperature and Density with Finite Corrections
We use the linear expansion, or optimized perturbation theory, to
evaluate the effective potential for the two dimensional Gross-Neveu model at
finite temperature and density obtaining analytical equations for the critical
temperature, chemical potential and fermionic mass which include finite
corrections. Our results seem to improve over the traditional large-N
predictions.Comment: 7 pages, 8 figure
The Elephant Quantum Walk
We explore the impact of long-range memory on the properties of a family of
quantum walks in a one-dimensional lattice and discrete time, which can be
understood as the quantum version of the classical "Elephant Random Walk"
non-Markovian process. This Elephant Quantum Walk is robustly superballistic
with the standard deviation showing a constant exponent, , whatever the quantum coin operator, on which the diffusion coefficient is
dependent. On the one hand, this result indicates that contrarily to the
classical case, the degree of superdiffusivity in quantum non- Markovian
processes of this kind is mainly ruled by the extension of memory rather than
other microscopic parameters that explicitly define the process. On the other
hand, these parameters reflect on the diffusion coefficient.Comment: 4 figures, any comments is welcome. Accepted in PR
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