Characterizing correlations and synchronization in collective dynamics

Synchronization, that occurs both for non-chaotic and chaotic systems, is a striking phenomenon with many practical implications in natural phenomena. However, even before synchronization, strong correlations occur in the collective dynamics of complex systems. To characterize their nature is essential for the understanding of phenomena in physical and social sciences. The emergence of strong correlations before synchronization is illustrated in a few piecewise linear models. They are shown to be associated to the behavior of ergodic parameters which may be exactly computed in some models. The models are also used as a testing ground to find general methods to characterize and parametrize the correlated nature of collective dynamics.Comment: 37 pages, 37 figures, Late

Cooperation, Punishment, Emergence of Government, and the Tragedy of Authorities

Under the conditions prevalent in the late Pleistocene epoch (small hunter-gatherer groups and frequent inter-group conflicts), coevolution of gene-related behavior and culturally transmitted group-level institutions provides a plausible explanation for the parochial altruistic and reciprocator traits of most modern humans. When, with the agricultural revolution, societies became larger and more complex, the collective nature of the monitoring and punishment of norm violators was no longer effective. This led to the emergence of new institutions of governance and social hierarchies. The transition from an egalitarian society and the acceptance of the new institutions may have been possible only if, in the majority of the population, the reciprocator trait had become an internalized norm. However, the new ruling class has its own dynamics, which in turn may lead to a new social crisis. Using a simple model inspired by previous work by Bowles and Gintis, these effects are studied here

Stellar Magnetism and starspots: the implications for exoplanets

Stellar variability induce by starspots can hamper the detection of exoplanets and bias planet property estimations. These features can also be used to study star-planet interactions as well as inferring properties from the underlying stellar dynamo. However, typical techniques, such as ZDI, are not possible for most host-stars. We present a robust method based on spot modelling to map the surface of active star allowing us to statistically study the effects and interactions of stellar magnetism with transiting exoplanets. The method is applied to the active Kepler-9 star where we find small evidence for a possible interaction between planet and stellar magnetosphere which leads to a 2:1 resonance between the spot rotation and orbital period.Comment: 4 pages, 1 figure, to be published in the proceedings of IAUS 302: Magnetic Fields Throughout Stellar Evolutio

A new convergent algorithm to approximate potentials from fixed angle scattering data

We introduce a new iterative method to recover a real compact supported potential of the Schr\"odinger operator from their fixed angle scattering data. The method combines a fixed point argument with a suitable approximation of the resolvent of the Schr\"odinger operator by partial sums associated to its Born series. Convergence is established for potentials with small norm in certain Sobolev spaces. As an application we show some numerical experiments that illustrate this convergence.Comment: 25 pages, 6 figure

The Drosophilidae (Diptera) of Fennoscandia and Denmark: replacing three misprinted plates

Three out of the 80 plates of fine line drawings of male terminalia in the book entitled The Drosophilidae (Diptera) of Fennoscandia and Denmark, published by Brill Leiden were misprinted. Here these three plates have been reprinted in the manner that they should have been published originally and provide an accurate representation of the complex male terminalia of Amiota subtusradiata Leucophenga quinquemaculata and Phortica variegata. Male terminalia republishing corrigenda In 2004, the authors published a book in the Fauna Entomologica Scandinavica series (Volume 39), entitled The Drosophilidae (Diptera) of Fennoscandia and Denmark (Bächli et al. 2004). Unfortunately, three of the plates with fine line drawings were misprinted. These plates displayed the complex male terminalia of Amiota subtusradiata Duda, 1934 (p. 44, Figs 98–101), Leucophenga quinquemaculata Strobl, 1893 (p. 68, Figs 148–151), and Phortica variegata (Fallén, 1823) (p. 75, Figs 164–167), which display a boreo-montane distribution throughout central Europe. In 2007, photomicrographs of the complex male terminalia of these species were published (Bächli and Vilela 2007); however, one of the photomicrographs was misprinted, and an erratum was published soon after (Bächli and Vilela 2009). Along the same lines, The Drosophilidae (Diptera) of Fennoscandia and Denmark is widely used and cited by Drosophilidae experts, mainly taxonomists, who rely on accurate illustrations to properly identify the specimens. Therefore, it was decided to republish these plates (including the captions), with permission from Brill Publishers, aiming to help taxonomists in the species identification process

Growth and exchange rate volatility: a panel data analysis

The aim of this article is to assess the role of real effective exchange rate volatility on long-run economic growth for a set of 82 advanced and emerging economies using a panel data set ranging from 1970 to 2009. With an accurate measure for exchange rate volatility, the results for the two-step system GMM panel growth models show that a more (less) volatile RER has significant negative (positive) impact on economic growth and the results are robust for different model specifications. In addition to that, exchange rate stability seems to be more important to foster long-run economic growth than exchange rate misalignment

A new species of Asthenopus (Ephemeroptera: Polymitarcyidae: Asthenopodinae) from Brazil and Colombia

A new species of Asthenopus, A. crenulatus sp. nov. is described from adults of both sexes from Brazil and Colombia. The new species is diagnosed by: male foreleg length 0.7–0.9 times the length of fore wing, marginal intercalary veins on the entire margin of fore and hind wings generally shorter than distance between longitudinal veins, forceps and penes long and slender, penes with many subapical spines. This new species is closely related with A. picteti (Hubbard). A key to the male adults of Asthenopus is included.Fil: Molineri, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucuman. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucuman. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; ArgentinaFil: Cruz, Paulo Vilela. Universidade Federal do Amazonas; BrasilFil: Emmerich, Daniel Enrique. Universidad de la República; Urugua