Echo of the Quantum Bounce

We identify a signature of quantum gravitational effects that survives from the early universe to the current era: Fluctuations of quantum fields as seen by comoving observers are significantly influenced by the history of the early universe. In particular we show how the existence (or not) of a quantum bounce leaves a trace in the background quantum noise that is not damped and would be non-negligible even nowadays. Furthermore, we estimate an upper bound for the typical energy and length scales where quantum effects are relevant. We discuss how this signature might be observed and therefore used to build falsifiability tests of quantum gravity theories.Comment: Revtex4.1. 2 Figures. V2: Content extended and edited to match published versio

The Quantum Echo of the Early Universe

We show that the fluctuations of quantum fields as seen by late comoving observers are significantly influenced by the history of the early Universe, and therefore they transmit information about the nature of spacetime in timescales when quantum gravitational effects were non-negligible. We discuss how this may be observable even nowadays, and thus used to build falsifiability tests of quantum gravity theories.Comment: 3 pages. 2 Figures. Proceedings Theory Canada 9. Published in Canadian Journal of Physics. (http://www.nrcresearchpress.com/doi/abs/10.1139/cjp-2014-0567

Violation of the strong Huygen's principle and timelike signals from the early Universe

We analyze the implications of the violations of the strong Huygens principle in the transmission of information from the early universe to the current era via massless fields. We show that much more information reaches us through timelike channels (not mediated by real photons) than it is carried by rays of light, which are usually regarded as the only carriers of information.Comment: 5 pages, 2 figures. RevTeX 4.1. V2: Updated to match published version. Previous title "A glimpse of the early universe without real light" modified to match Physical Review Letters published versio

Design of an analog/digital truly random number generator

An analog-digital system is presented for the generation of truly random (aperiodic) digital sequences. This model is based on a very simple piecewise-linear discrete map which is suitable for implementation using monolithic analog sampled-data techniques. Simulation results are given illustrating the optimum choice of the model parameters. Circuit implementations are reported for the discrete map using both switched-capacitor (SC) and switched-current (SI) techniques. The layout of a SI prototype in a 3-μm n-well double-polysilicon double-metal technology is included

La enseñanza de la Educación Física y el Deporte en las colonias de vacaciones del Municipio de Avellaneda

La presentación que a continuación se detalla, es una investigación que se propuso indagar aspectos relacionados con la enseñanza de la Educación Física y los deportes en las colonias de verano del Municipio de Avellaneda, las cuales, implementadas desde el gobierno local con fines inclusivos, reciben a sectores sociales en condiciones de vulnerabilidad. La relevancia de este trabajo se relaciona con dos ejes bien detallados, uno, con los aspectos vinculados a la educación no formal de la Educación Física, en este caso, con las colonias de vacaciones de verano, y el acceso a la misma de los niños que allí concurren y otro con la importancia de la Educación Física y los deportes en la actualidad. La problemática se abordó mediante un estudio de tipo descriptivo, donde las fuentes de información fueron entrevistas y observaciones de actividades llevadas adelante en las colonias de verano. Cabe destacar que se contó con total predisposición por parte de la gestión local del Municipio de Avellaneda para ingresar a las sedes y para el desarrollo del trabajo de campo; así como con los responsables del programa de colonias implementado en la misma jurisdicción.Eje 5: Las prácticas de la Educación Física vinculadas con la integración e inclusión social. Mesa de Trabajo A: Políticas públicas educativas.Departamento de Educación Físic

Nonlinear time-domain macromodeling of OTA circuits

The authors present an accurate nonlinear macromodel of the operational transconductance amplifier (OTA) which is suitable for the transient simulation of OTA-based CMOS analog integrated circuits. As compared to device-level OTA models, the proposed macromodel is advantageous in terms of CPU time. Also, in circuits with many OTAs, it does not have the problems of convergence that the device-level MODEL has. All the macromodel parameters can be calculated from measurements made at the OTA terminals. Experimental results from a 3-μm CMOS OTA prototype as well as simulation results from device-level models are included and compared to simulation results from the macromodel

Bryoflora of tbe City of Salamanca (Spain)

Aytjso, i. E.; ELÍAS RivAs, M. i. & RIJP¡OFRA GIRALDo, i. L. 1995. Brioflora de la Ciudad de Salamanca. Bol. Coniplatensis 20: 45-53. Se citan 38 briófitos (37 musgos y 1 hepática) para la ciudad de Salamanca, 6 de los cuales son novedad para la provincia.Ayuso. J. B.~ ELÍAS RIvAS, M. J. & RUPIOBRA GIRALDo, 1. L. ¡995. Brioflora de la Ciudad de Salamanca. Boí. Complatensts 20: 45-53. Thirty eight bryophytes (37 mosses and ¡ liverwort) are reponed from the city of Salamanca (Spain). 6 are newly for the province

States of low energy in the Schwinger effect

States of low energy in cosmology minimise the energy density when smeared in a chosen time interval. We extend their construction to generic homogeneous (possibly anisotropic) particle creation settings. Focusing on the Schwinger effect, we study the role played by the support of the smearing function and identify the vacua obtained in the limiting cases of small and large time intervals. We also analyse the spectral properties of the power spectrum and the number of created particles, which are complementary in characterising the vacuum, and investigate the multipolar contributions coming from the anisotropies.Comment: 17 pages, 4 figure

Una subespecie nueva en el género Sideritis L. (Lamiaceae)

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