Detours and Paths: BRST Complexes and Worldline Formalism

We construct detour complexes from the BRST quantization of worldline diffeomorphism invariant systems. This yields a method to efficiently extract physical quantum field theories from particle models with first class constraint algebras. As an example, we show how to obtain the Maxwell detour complex by gauging N=2 supersymmetric quantum mechanics in curved space. Then we concentrate on first class algebras belonging to a class of recently introduced orthosymplectic quantum mechanical models and give generating functions for detour complexes describing higher spins of arbitrary symmetry types. The first quantized approach facilitates quantum calculations and we employ it to compute the number of physical degrees of freedom associated to the second quantized, field theoretical actions.Comment: 1+35 pages, 1 figure; typos corrected and references added, published versio

Stellar activity cycles and contribution of the deep layers knowledge

It is believed that magnetic activity on the Sun and solar-type stars are tightly related to the dynamo process driven by the interaction between rotation, convection, and magnetic field. However, the detailed mechanisms of this process are still incompletely understood. Many questions remain unanswered, e.g.: why some stars are more active than others?; why some stars have a flat activity?; why is there a Maunder minimum?; are all the cycles regular? A large number of prox- ies are typically used to study the magnetic activity of stars as we cannot resolve stellar discs. Recently, it was shown that asteroseismology can also be used to study stellar activity, making it an even more powerful tool. If short cycles are not so un- common, we expect to detect many of them with missions such as CoRoT, Kepler, and possibly the PLATO mission. We will review some of the latest results obtained with spectroscopic measurements. We will show how asteroseismology can help us to better understand the complex process of dynamo and illustrate how the CoRoT and Kepler missions are revolutionizing our knowledge on stellar activity. A new window is being opened over our understanding of the magnetic variability of stars.Comment: 7 pages. To appear in Astrophysics and Space Science Proceedings series of the 20th Stellar pulsation conference held in Granada (Spain) from 6 to 10 September 2011

Risk Factors and Trends Associated With Mortality Among Adults With Hip Fracture in Singapore

10.1001/jamanetworkopen.2019.19706JAMA network open32e191970

Enterovirus 71 infection of motor neuron-like NSC-34 cells undergoes a non-lytic exit pathway

10.1038/srep36983Scientific Reports63698

Contextualised Concerns: The Online Privacy Attitudes of Young Adults

Part 3: Ethical, Social, and Legal AspectsInternational audienceExisting research into online privacy attitudes, whilst useful, remains insufficient. This paper begins by outlining the shortcomings of this existing research before offering a fresh approach which is inspired by Solove’s notion of “situated and dynamic” privacy. With reference to ongoing PhD research it is argued that the generation of rich, situated data can help us to understand privacy attitudes in context. In this research semi-structured interviews are being used in order to grasp how young adults understand, manage, and negotiate their privacy across online settings. The paper concludes with a call for further qualitative research into online privacy attitudes and suggests focusing on more niche online settings than Facebook