814 research outputs found
Death by starvation in May-Leonard models
We consider the dynamics of spatial stochastic May-Leonard models with mutual
predation interactions of equal strength between any two individuals of
different species. Using two-dimensional simulations, with two and three
pecies, we investigate the dynamical impact of the death of individuals after a
given threshold number of successive unsuccessful predation attempts. We find
that the death of these individuals can have a strong impact on the dynamics of
population networks and provide a crucial contribution to the preservation of
coexistence.Comment: 7 pages, 9 figure
Predicting charged lepton flavor violation from 3-3-1 gauge symmetry
The simplest realization of the inverse seesaw mechanism in a gauge theory offers striking flavor
correlations between rare charged lepton flavor violating decays and the
measured neutrino oscillations parameters. The predictions follow from the
gauge structure itself without the need for any flavor symmetry. Such tight
complementarity between charged lepton flavor violation and oscillations
renders the scenario strictly testable.Comment: 7 pages, 2 figures; v2: discussion extended. Matches version
published in PR
Power in Transition: Empowering Discourses on Sustainability Transitions
This is a book about power and transformative change. It explores how groups of people who are trying to transform the mobility system are affected by notions of change and power, and how they deal with the dilemmas of power. Academic literature on power and transitions offers concepts to grasp phenomena in practice. And visa versa, observing these practices allows us to gain new understanding of power in relation to transformative change. More specifically, this book is about power in relation to transition studies, a new research field which has the ambition to both understand and foster societal transformation. It is also about the role of power in transition management, a new prescriptive governance model for sustainable development
Consistency of WIMP Dark Matter as radiative neutrino mass messenger
The scotogenic scenario provides an attractive approach to both Dark Matter
and neutrino mass generation, in which the same symmetry that stabilises Dark
Matter also ensures the radiative seesaw origin of neutrino mass. However the
simplest scenario may suffer from inconsistencies arising from the spontaneous
breaking of the underlying symmetry. Here we show that the
singlet-triplet extension of the simplest model naturally avoids this problem
due to the presence of scalar triplets neutral under the which
affect the evolution of the couplings in the scalar sector. The scenario offers
good prospects for direct WIMP Dark Matter detection through the nuclear recoil
method.Comment: 16 pages, 7 figure
Spatial patterns and biodiversity in off-lattice simulations of a cyclic three-species Lotka-Volterra model
Stochastic simulations of cyclic three-species spatial predator-prey models
are usually performed in square lattices with nearest neighbor interactions
starting from random initial conditions. In this Letter we describe the results
of off-lattice Lotka-Volterra stochastic simulations, showing that the
emergence of spiral patterns does occur for sufficiently high values of the
(conserved) total density of individuals. We also investigate the dynamics in
our simulations, finding an empirical relation characterizing the dependence of
the characteristic peak frequency and amplitude on the total density. Finally,
we study the impact of the total density on the extinction probability, showing
how a low population density may jeopardize biodiversity.Comment: 5 pages, 7 figures; new version, with new title and figure
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