arXiv subjects

Lilian Prado

Publications and source records attributed to Lilian Prado.

5 recordsLinked to original sources

arXiv2018

Theoretical High Energy Physics in Latin America from 1990 to 2012: a Statistical Study

We present a statistical overview of the publications in theoretical high energy physics (HEP), which emerged in Latin America (LA) in the period from 1990 to 2012. Our study captures the eight Latin American nations, which are dominant in this field of research: Brazil, Mexico, Argentina, Chile, Colombia, Venezuela, Uruguay and Cuba. As an intercontinental benchmark, we compare them with India, Canada, South Korea, Belgium and South Africa. We consider the productivity of research papers in specialized high-impact journals, and the corresponding numbers of citations. The goal is to document the efforts in LA to catch up with the most wealthy countries, in a field of research without direct practical benefits. The restriction to theoretical HEP excludes large international collaborations, which enables a fair evaluation of national achievements. We further investigate how these records are correlated with three socio-economic indices: the Gross Domestic Product (GDP), the Human Development Index (HDI) and the Education Index (EI). Despite some progress, there remains a backlog of LA compared to the dominant countries, which cannot be explained solely by economic deficiency. In general, a detailed correlation between the socio-economic and scientific evolution is not obvious.

physics.soc-ph↗

arXiv2014

Interpretation of topologically restricted measurements in lattice sigma-models

We consider models with topological sectors, and difficulties with their Monte Carlo simulation. In particular we are concerned with the situation where a simulation has an extremely long auto-correlation time with respect to the topological charge. Then reliable numerical measurements are possible only within single topological sectors. The challenge is to assemble such restricted measurements to obtain an approximation for the full-fledged result, which corresponds to the correct sampling over the entire set of configurations. Under certain conditions this is possible, and it provides in addition an estimate for the topological susceptibility chi_t. Moreover, the evaluation of chi_t might be feasible even from data in just one topological sector, based on the correlation of the topological charge density. Here we present numerical test results for these techniques in the framework of non-linear sigma-models.

hep-lat↗

arXiv2012

40 Years of Calculus in 4 + epsilon Dimensions

Modern physics describes elementary particles by a formalism known as Quantum Field Theory. However, straight calculations with this formalism lead to numerous divergences, hence one needs a suitable regularization scheme. 40 years ago a surprising scheme was established for this purpose: Dimensional Regularization. One computes in "4 + epsilon space-time dimensions", and takes the limit to our 4 dimensional space-time at the end. This method caused a revolution in particle physics, which led to the Standard Model. Many people refer to its results, and even apply it, without being aware that its history actually started in Latin America, more precisely in La Plata, Argentina. ----- La física moderna describe a las partículas elementales por medio del formalismo conocido como Teoría Cuántica de Campos. Sin embargo, los cálculos directos realizados con este formalismo llevan a una gran cantidad de divergencias, por lo que es necesario un método para regularizarlos. Hace 40 años se estableció un esquema sorprendente para este objetivo: la Regularización Dimensional. Se calcula en "4 + epsilon dimensiones espacio-temporales", y al final se toma el límite a nuestro espacio y tiempo en 4 dimensiones. Este método causó una revolución en la física de partículas, que resultó en el Modelo Estándar. Muchas personas hacen referencia sus resultados, e incluso la aplican, sin saber que su historia comenzó en América Latina, precisamente en La Plata, Argentina.

physics.hist-ph↗

arXiv2011

Impact of DM direct searches and the LHC analyses on branon phenomenology

Dark Matter direct detection experiments are able to exclude interesting parameter space regions of particle models which predict an important amount of thermal relics. We use recent data to constrain the branon model and to compute the region that is favored by CDMS measurements. Within this work, we also update present colliders constraints with new studies coming from the LHC. Despite the present low luminosity, it is remarkable that for heavy branons, CMS and ATLAS measurements are already more constraining than previous analyses performed with TEVATRON and LEP data.

hep-ph↗

arXiv2010

Dark Matter and Higgs Sector

The inert doublet model is an extension of the Standard Model of Elementary Particles that is defined by the only addition of a second Higgs doublet without couplings to quarks or leptons. This minimal framework has been studied for many reasons. In particular, it has been suggested that the new degrees of freedom contained in this doublet can account for the Dark Matter of the Universe.

hep-ph↗