2,294 research outputs found
Color screening in flavor QCD at large distances
We study correlation functions of spatially separated static quark-antiquark
pairs in flavor QCD in order to investigate the nature of color screening
at high temperatures. We perform lattice calculations in a wide temperature
range, , using the highly improved
staggered quark (HISQ) action and several lattice spacings to control
discretization effects. We alleviate the UV noise problem through the use of
four dimensional hypercubic (HYP) smearing, which enables the reconstruction of
correlators and determination of screening properties even at low temperatures
and at large distances.Comment: 8 pages, 9 figure
Neutrino-antineutrino oscillations as a possible solution for the LSND and MiniBooNE anomalies?
We investigate resonance structures in CPT and Lorentz symmetry violating
neutrino-antineutrino oscillations in a two generation framework. We work with
four non-zero CPT-violating parameters that allow for resonant enhancements in
neutrino-antineutrino oscillation phenomena in vacuo which are suitably
described in terms of charge conjugation eigenstates of the system. We study
the relation between the flavor, charge conjugation and mass eigenbasis of
neutrino-antineutrino oscillations and examine the interplay between the
available CPT-violating parameter space and possible resonance structures.
Eventually we remark on the consequences of such scenarios for neutrino
oscillation experiments, namely possible solutions for the LSND and MiniBooNE
anomalies.Comment: 14 pages, 3 figure
Explaining LSND and MiniBooNE using altered neutrino dispersion relations
We investigate the possibility to explain the MiniBooNE anomaly by CPT and
Lorentz symmetry violating neutrino-antineutrino oscillations in a two
generation framework. We work with four non-zero CPT-violating parameters that
allow for resonant enhancements in neutrino-antineutrino oscillation phenomena
in vacuo which are suitably described in terms of charge conjugation
eigenstates of the system. We study the relation between the flavor, charge
conjugation and mass eigenbasis of neutrino-antineutrino oscillations and
examine the interplay between the available CPT-violating parameter space and
possible resonance structures.Comment: 3 pages, 1 figure, Proceedings for Erice 2009 Neutrinos in Cosmology,
in Astro-, Particle- and Nuclear Physic
China’s Recent Maritime Legislation. A Study of Consistency with the International Law of the Sea and the Political Context
No abstract available
Measuring Human Capital with Social Media Data and Machine Learning
In response to persistent gaps in the availability of survey data, a new strand of research leverages alternative data sources through machine learning to track global development. While previous applications have been successful at predicting outcomes such as wealth, poverty or population density, we show that educational outcomes can be accurately estimated using geo-coded Twitter data and machine learning. Based on various input features, including user and tweet characteristics, topics, spelling mistakes, and network indicators, we can account for ~70 percent of the variation in educational attainment in Mexican municipalities and US counties
Multiphase Thermohaline Convection in the Earth's Crust: II. Benchmarking and Application of a Finite Element - Finite Volume Solution Technique with a NaCl-H2O Equation of State
We present the benchmarking of a new finite element - finite volume (FEFV) solution technique capable of modeling transient multiphase thermohaline convection for geological realistic p-T-X conditions. The algorithm embeds a new and accurate equation of state for the NaCl-H2O system. Benchmarks are carried out to compare the numerical results for the various component-processes of multiphase thermohaline convection. They include simulations of (i) convection driven by temperature and/or concentration gradients in a single-phase fluid (i.e., the Elder problem, thermal convection at different Rayleigh numbers, and a free thermohaline convection example), (ii) multiphase flow (i.e., the Buckley-Leverett problem), and (iii) energy transport in a pure H2O fluid at liquid, vapor, supercritical, and two-phase conditions (i.e., comparison to the U.S. Geological Survey Code HYDROTHERM). The results produced with the new FEFV technique are in good agreement with the reference solutions. We further present the application of the FEFV technique to the simulation of thermohaline convection of a 400°C hot and 10 wt.% saline fluid rising from 4km depth. During the buoyant rise, the fluid boils and separates into a high-density, high-salinity liquid phase and a low-density, low-salinity vapor phas
- …