Spin wave theory for 2D disordered hard-core bosons

A spin-wave (SW) approach for hard-core bosons is presented to treat the problem of two dimensional boson localization in a random potential. After a short review of the method to compute 1/S-corrected observables, the case of random on-site energy is discussed. Whereas the mean-field solution does not display a Bose glass (BG) phase, 1/S corrections do capture BG physics. In particular, the localization of SW excitations is discussed through the inverse participation ratio.Comment: TIDS15 conferenc

Rediscovering Chilean Culture

The idea for my project started with a deep questioning of my roots as a Chilean musician. I’ve always been interested in the music and culture of my country. One of the aspects of my project was to further research the by government manipulated changes to the culture, especially the systemic oppression of the culture of African descendants. These forced changes have produced different versions of how our history was developed which sometimes clash with each other, not only in music, but also in other aspects of our culture and identity. There have even been versions of our history that deny the whole existence of both African cultural influence and the Afro- descendant community. For these reasons I decided to do a deep research about the origins of Chilean music and its history particularly about two different styles called “Cueca” and “Túmbe”. A profound understanding of these music styles was crucial to my project, not only the musical codes but also how the lyrics work and how this music relates to the dance. All these aspects were fundamental for putting together my project, in terms of the compositions and putting together the presentation where I exposed some of these historic and political issues.https://remix.berklee.edu/graduate-studies-global-jazz/1098/thumbnail.jp

Demo 5. Choques y explosiones sobre un carril

Objetivo: Demostrar la conservación del momento lineal en choques (elásticos e inelásticos) y explosiones, para distintos valores de la masa de los cuerpos involucrados

Demo 98. Péndulo electrostático

Objetivo: Detectar la presencia de cargas eléctricas con materiales sencillos

Demo 22. Ondas estacionarias en una cuerda

Objetivo: Demostrar la relación entre velocidad de propagación de una onda en una cuerda, longitud de onda, frecuencia y tensión

A new way of looking at the sky : neutrino telescopes

Neutrinos are weakly-interacting neutral particles, which makes them powerful sources of information about the most energetic processes in the universe, such as the origin of ultra-energetic cosmic rays or gamma-ray bursts. However, a price must be paid in order to detect them: gargantuan detectors at the bottom of the sea or under the Antarctic ice are required. The detection of the first high-energy cosmic neutrinos in 2013 by the IceCube observatory represented the start of so-called neutrino astronomy, a new way of observing the universe, which can play a key role in future discoveries. In this article, we describe how neutrino telescopes work, as well as the different initial configurations that made this new twenty-first century astronomy possible

Comportamiento del flux de CO2 en el maritorio de San Andrés Islas en 2019

This document estimated the behavior of the CO2 flux in the San Andrés Islas maritime for the first half of 2019. This behavior was established based on the thermodynamic relationship between the sea surface temperature, the partial pressures of CO2 in the atmosphere and the water column, this from data derived from remote sensors. The satellite data were derived from the MODIS aqua sensors and the MERRA model for sea surface temperature and wind speed respectively. Satellite images were obtained from NASA databases, subsequently processed and specialized in ArcGis 10.1. Finally, the behavior of the CO2 flux is shown for the San Andrés Islas maritime, finding that it does not have a tendency to capture CO2, so acidification processes are discarded for the selected study period.En el presente documento se estimó el comportamiento del flux de CO2 en el maritorio de San Andrés Islas para el primer semestre de 2019. Dicho comportamiento se estableció a partir de la relación termodinámica entre la temperatura superficial del mar, las presiones parciales del CO2 en la atmosfera y la columna de agua, esto a a partir de datos derivados de sensores remotos. Los datos satelitales fueron derivados de los sensores MODIS aqua y el modelo MERRA para la temperatura superficial del mar y la velocidad del viento respectivamente. Las imágenes satelitales se obtuvieron a partir de las bases de datos de la NASA, posteriormente procesadas y especializadas en ArcGis 10.1. Finalmente, se muestra el comportamiento del flux de CO2 para el maritorio de San Andrés Islas, encontrando que este no tiene una tendencia a la captura de CO2, por lo cual se descartan procesos de acidificación para el periodo de estudio seleccionado