Triad communication and specificity of motor games

Se estudian las tríadas desde la comunicación motriz, con el propósito de a) identificar los distintos tipos a que da lugar la tríada; b) medir las diferencias entre los tipos de tríadas estudiados; y c) mostrar con juegos concretos la viabilidad de los juegos de tríada trasladables a programas. Se justifican 13 tipos susceptibles de ser viables como juegos motores, que corresponden a tríadas completas y a tríadas con ausencia de una conexión entre dos de sus nodos. Se comparan cuatro juegos por medio de cinco indicadores: roles, interacción intragrupo, interacción intergrupos, emisiones o recepciones, y valencia positiva o negativa. La comparación evidencia el comportamiento específico de las tríadas motrices. Los resultados confirman la viabilidad de los juegos estudiados, y las diferencias relativas entre antagonismo y solidaridad. Los juegos motores de tríada son una fuente singular de comunicación motriz y una alternativa pedagógica para los programas de juegosTriads are studied from a motor communication point of view. Our study is aimed at a) identifying the various type that triads originate; b) measuring the differences among the type of the studied triads; and c) showing with specific examples the feasibility of triad games transferred to programs. 13 types are justified as being likely feasible as motor games. They correspond to complete triads and to triads with one missing connection between two of its nodes. Four games are compared through five different proxies: roles, intra-group interaction, interaction among groups, emissions and receptions, and positive or negative valence. The comparison demonstrates the specific behavior of motor triads. The results confirm the feasibility of the studied games and the relative differences between rivalry and solidarity. Motor games with a triad structure are a singular source of communication and a pedagogic alternative for game program

Vacuum Choices and the Predictions of Inflation

In the presence of a short-distance cutoff, the choice of a vacuum state in an inflating, non-de Sitter universe is unavoidably ambiguous. The ambiguity is related to the time at which initial conditions for the mode functions are specified and to the way the expansion of the universe affects those initial conditions. In this paper we study the imprint of these uncertainties on the predictions of inflation. We parametrize the most general set of possible vacuum initial conditions by two phenomenological variables. We find that the generated power spectrum receives oscillatory corrections whose amplitude is proportional to the Hubble parameter over the cutoff scale. In order to further constrain the phenomenological parameters that characterize the vacuum definition, we study gravitational particle production during different cosmological epochs.Comment: 10 two-column pages, 1 figure; uses RevTeX

Constraints on the structure and seasonal variations of Triton’s atmosphere from the 5 October 2017 stellar occultation and previous observations⋆

Context. A stellar occultation by Neptune's main satellite, Triton, was observed on 5 October 2017 from Europe, North Africa, and the USA. We derived 90 light curves from this event, 42 of which yielded a central flash detection. Aims. We aimed at constraining Triton's atmospheric structure and the seasonal variations of its atmospheric pressure since the Voyager 2 epoch (1989). We also derived the shape of the lower atmosphere from central flash analysis. Methods. We used Abel inversions and direct ray-tracing code to provide the density, pressure, and temperature profiles in the altitude range ∼8 km to ∼190 km, corresponding to pressure levels from 9 μbar down to a few nanobars. Results. (i) A pressure of 1.18 ± 0.03 μbar is found at a reference radius of 1400 km (47 km altitude). (ii) A new analysis of the Voyager 2 radio science occultation shows that this is consistent with an extrapolation of pressure down to the surface pressure obtained in 1989. (iii) A survey of occultations obtained between 1989 and 2017 suggests that an enhancement in surface pressure as reported during the 1990s might be real, but debatable, due to very few high S/N light curves and data accessible for reanalysis. The volatile transport model analysed supports a moderate increase in surface pressure, with a maximum value around 2005-2015 no higher than 23 μbar. The pressures observed in 1995-1997 and 2017 appear mutually inconsistent with the volatile transport model presented here. (iv) The central flash structure does not show evidence of an atmospheric distortion. We find an upper limit of 0.0011 for the apparent oblateness of the atmosphere near the 8 km altitude