New tests and applications of the worldline path integral in the first order formalism

We present different non-perturbative calculations within the context of Migdal's representation for the propagator and effective action of quantum particles. We first calculate the exact propagators and effective actions for Dirac, scalar and Proca fields in the presence of constant electromagnetic fields, for an even-dimensional spacetime. Then we derive the propagator for a charged scalar field in a spacelike vortex (i.e., instanton) background, in a long-distance expansion, and the exact propagator for a massless Dirac field in 1+1 dimensions in an arbitrary background. Finally, we present an interpretation of the chiral anomaly in the present context, finding a condition that the paths must fulfil in order to have a non-vanishing anomaly.Comment: 26 page

Gender entrepreneurship in Latin America: Does the institutional system matter?

This study attempts to uncover the institutional determinants of female entrepreneurship in a set of eight Latin American countries. Following the institutional system classification in the literature, we grouped the set of countries into three categories: State-Led, Emerging Liberal Market, and Family Led. We then split the data panel into two different groups: Argentina, Bolivia, Ecuador, and Venezuela, which are mostly State-Led; the other group includes Brazil, Chile, Colombia, Mexico, and Peru, which are either Family Led or Emerging Liberal Market Oriented where the degree of State intervention in the economy is lower. Our research investigated these institutional determinants of female entrepreneurship using a set of socioeconomic, cognitive, and macroeconomic variables. Our findings offer a new perspective on gender entrepreneurship in Latin America, considering internal and external factor. The first considers institutional varieties and the latter macroeconomic effects. This is relevant in order to find relevant incentives of entrepreneurship by gender.info:eu-repo/semantics/publishedVersio

Bringing Together Gravity and the Quanta

Due to its underlying gauge structure, teleparallel gravity achieves a separation between inertial and gravitational effects. It can, in consequence, describe the isolated gravitational interaction without resorting to the equivalence principle, and is able to provide a tensorial definition for the energy-momentum density of the gravitational field. Considering the conceptual conflict between the local equivalence principle and the nonlocal uncertainty principle, the replacement of general relativity by its teleparallel equivalent can be considered an important step towards a prospective reconciliation between gravitation and quantum mechanics.Comment: 9 pages. Contribution to the proceedings of the Albert Einstein Century International Conference, Paris, 18-22 July, 200

Genetic Variability within Two Adapted Populations of Tall Wheatgrass (\u3ci\u3eThynopyrum ponticum\u3c/i\u3e) in Argentina

The genetic variability within two adapted populations of tall wheatgrass (Thinopyrum ponticum) was evaluated in Argentina, as an introductory part of a breeding programme in progress at our Institute. The final aim of this programme is to provide new cultivars of tall wheatgrass, adapted to different management systems. Two hundred fifty plants per population were grown from seeds, clonally propagated and transplanted as a spaced-plant trial in a randomized design with three replicates. The results indicated large differences between genotypes within the two populations for most attributes measured, though there were no significant differences between populations. Attributes related with forage yield, forage quality and seed production had high to medium broad-sense heritability values, suggesting the importance of including the adapted germoplasm in the breeding programme in progress at INTA