On the structure of trans-series in quantum field theory

Many observables in quantum field theory can be expressed in terms of trans-series, in which one adds to the perturbative series a typically infinite sum of exponentially small corrections, due to instantons or to renormalons. Even after Borel resummation of the series in the coupling constant, one has to sum this infinite series of small exponential corrections. It has been argued that this leads to a new divergence, which is sometimes called the divergence of the OPE. We show that, in some interesting examples in quantum field theory, the series of small exponential corrections is convergent, order by order in the coupling constant. In particular, we give numerical evidence for this convergence property in the case of the free energy of integrable asymptotically free theories, which has been intensively studied recently in the framework of resurgence. Our results indicate that, in these examples, the Borel resummed trans-series leads to a well defined function, and there are no further divergences.Comment: 31 pages, 7 figure

Instantons, renormalons and the theta angle in integrable sigma models

Some sigma models which admit a theta angle are integrable at both $\vartheta=0$ and $\vartheta=\pi$. This includes the well-known $O(3)$ sigma model and two families of coset sigma models studied by Fendley. We consider the ground state energy of these models in the presence of a magnetic field, which can be computed with the Bethe ansatz. We obtain explicit results for its non-perturbative corrections and we study the effect of the theta angle on them. We show that imaginary, exponentially small corrections due to renormalons remain unchanged, while instanton corrections change sign, as expected. We find in addition corrections due to renormalons which also change sign as we turn on the theta angle. Based on these results we present an explicit non-perturbative formula for the topological susceptibility of the $O(3)$ sigma model in the presence of a magnetic field, in the weak coupling limit.Comment: version 2: 45 pages, 8 figures, minor corrections in text and equation

MARQUES, Roberto. Cariri eletrônico: paisagens sonoras no Nordeste. São Paulo: Intermeios, 2015. 194 p.

Nordeste derrapante: vicissitudes de uma cena musical ruidosa Como compreender o Brasil e seus brasis sem reconhecer a existência de espaços, lugares e tempos híbridos? É possível escrever uma história particular de nação sem lançar luz para incertezas e ambivalências? Perseguindo perguntas como essas, Lilia Schwarcz e Heloisa Starling (2015) debruçaram-se na árdua tarefa de revisitar mitos, narrativas e histórias sobre um país, o Brasil, cujas reincidentes ambivalências articulam supostament..

STUDY OF MOTOR SKILL IN ELDERS FOR THE DEVELOPMENT OF A HIERARCHY OF REQUISITES TO THE DESIGN OF PRODUCTS

This article gives examples on how to use knowledge related to human abilities on the development of a hierarchy of users’ request, helping and guiding an ergonomic project. The article presents different methods of classification of the human abilities and exemplifies with a tool that correlates aged users’ requests with the abilities needed to interact with automatic teller machines of banks

Perfil demográfico, clínico e cirúrgico de uma série de 65 herniorrafias femorais realizadas no Hospital Florianópolis, em Florianópolis, Santa Catarina, entre julho de 1979 e agosto de 2003.

Trabalho de Conclusão de Curso - Universidade Federal de Santa Catarina. Curso de Medicina. Dapartamento de Clínica Cirúrgica

Encontros e desencontros

Procura-se compreender como se dá a dinâmica das relações homoeróticas entre gays em duas boates GLS de Belém: Lux e Malícia. Enquanto problemática, questiona-se se o fato de um gay frequentar algum desses lugares é relevante ou não, na busca por parceiros. Utilizam-se, para compor análises interseccionais, alguns recortes como gênero, classe e idade / geração, procurando entender de que modo influenciam nas escolhas, expectativas e trajetos: dificultando, facilitando, limitando ou abrindo possibilidades ao estabelecimento de relações homoeróticas entre gays. A escolha dos entrevistados partiu do que chamei de “grau de variação sócio-cultural”: “negros”, “brancos”, de classes sociais distintas, velhos, novos, com performance de gênero masculina, com performance de gênero feminina; Entre outras palavras, a intenção foi abarcar a maior diversidade de pessoas: moradores de bairros centrais ou periféricos, que consumissem produtos distintos, com grau de escolaridade variado, que estivessem em diversas fases da vida. À guisa de finalizações, o que se pode perceber é a não-dicotomização – ficar ou namorar? – por meio das interações nos espaços supracitados; por maior que seja o interesse em estabelecer vínculos maiores de afeto, sexo etc. Contudo, existem outros pontos de destaque: encontrar amigos, participar de festas temáticas, diversão, música, ambiente, pessoas etc.This work aims at understanding the dynamics of the relations between gays in two clubs GLS of Belém: Lux and Malícia. As a problematics, it is questioned whether the fact of a gay attending some of these places is relevant, or not, in search for partners. Some frameworks were used to compose intersectional analyses, to know: gender, social class and age / generation, looking to understand in which ways that influences in the choices, expectations and interactions: making it difficult, facilitating, limiting or opening possibilities to the establishment of relationships between gays. The choice of interviewed ones departed from what I called degree of partner’s cultural variation: “afro-descendents”, “caucasians”, of distinct social classes, oldsters, youngsters, with masculine gender performance, or feminine gender performance. In other words, the intention was to open the study to a larger diversity of people: inhabitants of central or peripherals neighborhoods that consumed distinct, with varied degree of education, which was in diverse stages of the life. As finishing, it was noticed the non-dichotomization – to have a casual encounter or a mentioned spaces; though, greater was the interest in establishing bigger bonds of affection, sex and so on. However, other points were prominent: finding friends, participating of thematic parties, diversion, music, environment, people, etc

Entre Fluxos e Contrafluxos, “Periferias” e “Centros”: descentralizando sociabilidades homossexuais na cidade de São Paulo

Este artigo objetiva mostrar a circulação de homossexuais pela cidade de São Paulo, evidenciando os fluxos e contrafluxos desse deslocamento, tanto na periferia quanto no centro. Neste sentido, e com base em dados de pesquisa, constatou-se haver heterogeneidade na produção de corporalidades e estilos relacionados à homossexualidade, assim também processos de diferenciação, identificação e subjetivação fortemente associados ao aspecto da circulação

FERIANI, Daniela Moreno; CUNHA, Flávia Melo da; DULLEY, Iracema (orgs.). Etnografia, etnografias: ensaios sobre a diversidade do fazer etnográfico antropológico.

FERIANI, Daniela Moreno; CUNHA, Flávia Melo da; DULLEY, Iracema (orgs.). Etnografia, etnografias: ensaios sobre a diversidade do fazer etnográfico antropológico

From theory to experimental evaluation: resource management in software-defined vehicular networks

Managing resources in dynamic vehicular environments is a tough task, which is becoming more challenging with the increased number of access technologies today available in connected cars (e.g., IEEE 802.11, LIE), in the variety of applications provided on the road (e.g., safety, traffic efficiency, and infotainment), in the amount of driving awareness/coordination required (e.g., local, context, and cooperative awareness), and in the level of automation toward zero-accident driving (e.g., platooning and autonomous driving). The open programmability and logically centralized control features of the software-defined networking (SDN) paradigm offer an attractive means to manage communication and networking resources in the vehicular environment and promise improved performance. In this paper, we enumerate the potentials of software-defined vehicular networks, analyze the need to rethink the traditional SDN approach from theoretical and practical standpoints when applied in this application context, and present an emulation approach based on the proposed node car architecture in Mininet-WiFi to showcase the applicability and some expected benefits of SDN in a selected use case scenario530693076FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP14/18482-