Universality and Non-Perturbative Definitions of 2D Quantum Gravity from Matrix Models

The universality of the non-perturbative definition of Hermitian one-matrix models following the quantum, stochastic, or $d=1$-like stabilization is discussed in comparison with other procedures. We also present another alternative definition, which illustrates the need of new physical input for $d=0$ matrix models to make contact with 2D quantum gravity at the non-perturbative level.Comment: 20 page

On the connections between Skyrme and Yang Mills theories

Skyrme theories on S^3 and S^2, are analyzed using the generalized zero curvature in any dimensions. In the first case, new symmetries and integrable sectors, including the B =1 skyrmions, are unraveled. In S^2 the relation to QCD suggested by Faddeev is discussedComment: Talk at the Workshop on integrable theories, solitons and duality. IFT Sao Paulo July 200

Generalized Integrability and the connections between Skyrme-Faddeev and Yang Mills theories

Skyrme theory on S^2 (Faddeev coset proposal), is analyzed with a generalization of 0-curvature integrability, based on gauge techniques. New expressions valid for models in the sphere are given. The relation of the minimum energy configurations to gauge vacua is clarified. Consequences of adding a potential term to break the SO(3) symmetry are discussed.Comment: Minor clarifications and corrections in the reference

Quantum effective actions from nonperturbative worldline dynamics

We demonstrate the feasibility of a nonperturbative analysis of quantum field theory in the worldline formalism with the help of an efficient numerical algorithm. In particular, we compute the effective action for a super-renormalizable field theory with cubic scalar interaction in four dimensions in quenched approximation (small-$N_f$ expansion) to all orders in the coupling. We observe that nonperturbative effects exert a strong influence on the infrared behavior, rendering the massless limit well defined in contrast to the perturbative expectation. Our numerical method is based on a direct use of probability distributions for worldline ensembles, preserves all Euclidean spacetime symmetries, and thus represents a new nonperturbative tool for an investigation of continuum quantum field theory.Comment: 33 pages, 10 figure

The relationship between word of mouth marketing and the adoption of mobile banking in millennials aged 25 to 30 years who reside in zone 7 of metropolitan lima (miraflores, san isidro, san borja, surco, la molina)

El canal digital bancario que mayor crecimiento ha tenido en los últimos años es la banca móvil, con un incremento promedio de 114% al año. No obstante, aún es un canal en desarrollo con mucho potencial. La penetración de la banca móvil del 2019 fue apenas de un 12% (Asbanc, 2019). Por otro lado, los consumidores se encuentran en un entorno saturado por la publicidad, donde todas las marcas ofrecen el mejor producto. Ante tal saturación, es difícil identificar qué promesas de valor son ciertas. Es entonces que la experiencia y testimonio de otros consumidores cobra mayor relevancia. Los sitios web de valoraciones, los videos de reseñas y los influenciadores son ejemplos de cómo las marcas están migrando hacia una comunicación más verídica y confiable proveniente de fuentes independientes. Más aun tratándose de la generación Millennial, quienes realizan sus compras influenciados por recomendaciones de familiares y amigos o por medio de reseñas vistas en línea (Ipsos, 2018). Es por ello que esta investigación tiene como objetivo determinar si el marketing boca a boca tiene relación con la adopción de la banca móvil en usuarios de banca móvil de 25 a 30 años que residen en la Zona 7 de Lima Metropolitana (Miraflores, San Isidro, San Borja, Surco, La Molina), para ello se midió la correlación entre el boca a boca y variables de adopción de la banca móvil como la facilidad de uso percibida, utilidad percibida, norma social, confianza, actitud e intención de uso.The digital banking channel that has grown the most in recent years is mobile banking, with an average increase of 114% per year. However, it is still a developing channel with great potential. Mobile banking penetration in 2019 was just 12% (Asbanc, 2019). On the other hand, consumers find themselves in an environment saturated by advertising, where all brands offer the best product. In the face of such saturation, it is difficult to identify which promises of value are true. It is then that the experience and testimony of other consumers becomes more relevant. Ratings websites, review videos, and influencers are examples of how brands are migrating toward more truthful and trustworthy communication from independent sources. Even more so in the case of the Millennial generation who make their purchases influenced by recommendations from family and friends or through reviews seen online (Ipsos, 2018). That is why this research aims to determine if word of mouth marketing is related to the adoption of mobile banking in mobile banking users aged 25 to 30 years who reside in Zone 7 of Metropolitan Lima (Miraflores, San Isidro, San Borja, Surco, La Molina), for this the correlation between word of mouth and mobile banking adoption variables such as perceived ease of use, perceived utility, social norm, trust, attitude and intention to use was measured.Tesi

Bogomol’nyi-Prasad-Sommerfield Skyrme model and nuclear binding energies

We use the classical Bogomol’nyi-Prasad-Sommerfield (BPS) soliton solutions of the BPS Skyrme model together with corrections from the collective coordinate quantization of spin and isospin, the electrostatic Coulomb energies, and a small explicit breaking of the isospin symmetry-accounting for the proton-neutron mass difference-to calculate nuclear binding energies. We find that the resulting binding energies are already in excellent agreement with their physical values for heavier nuclei, demonstrating thereby that the BPS Skyrme model is a distinguished starting point for a detailed quantitative investigation of nuclear and low-energy strong interaction physics

Effects of pre-operative isolation on postoperative pulmonary complications after elective surgery: an international prospective cohort study an international prospective cohort study

We aimed to determine the impact of pre-operative isolation on postoperative pulmonary complications after elective surgery during the global SARS-CoV-2 pandemic. We performed an international prospective cohort study including patients undergoing elective surgery in October 2020. Isolation was defined as the period before surgery during which patients did not leave their house or receive visitors from outside their household. The primary outcome was postoperative pulmonary complications, adjusted in multivariable models for measured confounders. Pre-defined sub-group analyses were performed for the primary outcome. A total of 96,454 patients from 114 countries were included and overall, 26,948 (27.9%) patients isolated before surgery. Postoperative pulmonary complications were recorded in 1947 (2.0%) patients of which 227 (11.7%) were associated with SARS-CoV-2 infection. Patients who isolated pre-operatively were older, had more respiratory comorbidities and were more commonly from areas of high SARS-CoV-2 incidence and high-income countries. Although the overall rates of postoperative pulmonary complications were similar in those that isolated and those that did not (2.1% vs 2.0%, respectively), isolation was associated with higher rates of postoperative pulmonary complications after adjustment (adjusted OR 1.20, 95%CI 1.05–1.36, p = 0.005). Sensitivity analyses revealed no further differences when patients were categorised by: pre-operative testing; use of COVID-19-free pathways; or community SARS-CoV-2 prevalence. The rate of postoperative pulmonary complications increased with periods of isolation longer than 3 days, with an OR (95%CI) at 4–7 days or ≥ 8 days of 1.25 (1.04–1.48), p = 0.015 and 1.31 (1.11–1.55), p = 0.001, respectively. Isolation before elective surgery might be associated with a small but clinically important increased risk of postoperative pulmonary complications. Longer periods of isolation showed no reduction in the risk of postoperative pulmonary complications. These findings have significant implications for global provision of elective surgical care. We aimed to determine the impact of pre-operative isolation on postoperative pulmonary complications after elective surgery during the global SARS-CoV-2 pandemic. We performed an international prospective cohort study including patients undergoing elective surgery in October 2020. Isolation was defined as the period before surgery during which patients did not leave their house or receive visitors from outside their household. The primary outcome was postoperative pulmonary complications, adjusted in multivariable models for measured confounders. Pre-defined sub-group analyses were performed for the primary outcome. A total of 96,454 patients from 114 countries were included and overall, 26,948 (27.9%) patients isolated before surgery. Postoperative pulmonary complications were recorded in 1947 (2.0%) patients of which 227 (11.7%) were associated with SARS-CoV-2 infection. Patients who isolated pre-operatively were older, had more respiratory comorbidities and were more commonly from areas of high SARS-CoV-2 incidence and high-income countries. Although the overall rates of postoperative pulmonary complications were similar in those that isolated and those that did not (2.1% vs 2.0%, respectively), isolation was associated with higher rates of postoperative pulmonary complications after adjustment (adjusted OR 1.20, 95%CI 1.05–1.36, p = 0.005). Sensitivity analyses revealed no further differences when patients were categorised by: pre-operative testing; use of COVID-19-free pathways; or community SARS-CoV-2 prevalence. The rate of postoperative pulmonary complications increased with periods of isolation longer than 3 days, with an OR (95%CI) at 4–7 days or ≥ 8 days of 1.25 (1.04–1.48), p = 0.015 and 1.31 (1.11–1.55), p = 0.001, respectively. Isolation before elective surgery might be associated with a small but clinically important increased risk of postoperative pulmonary complications. Longer periods of isolation showed no reduction in the risk of postoperative pulmonary complications. These findings have significant implications for global provision of elective surgical care