Robust oscillations in SIS epidemics on adaptive networks: Coarse-graining by automated moment closure

We investigate the dynamics of an epidemiological susceptible-infected-susceptible (SIS) model on an adaptive network. This model combines epidemic spreading (dynamics on the network) with rewiring of network connections (topological evolution of the network). We propose and implement a computational approach that enables us to study the dynamics of the network directly on an emergent, coarse-grained level. The approach sidesteps the derivation of closed low-dimensional approximations. Our investigations reveal that global coupling, which enters through the awareness of the population to the disease, can result in robust large-amplitude oscillations of the state and topology of the network.Comment: revised version 6 pages, 4 figure

Spin and angular momentum in the nucleon

Using the covariant spectator theory (CST), we present the results of a valence quark-diquark model calculation of the nucleon structure function f(x) measured in unpolarized deep inelastic scattering (DIS), and the structure functions g1(x) and g2(x) measured in DIS using polarized beams and targets. Parameters of the wave functions are adjusted to fit all the data. The fit fixes both the shape of the wave functions and the relative strength of each component. Two solutions are found that fit f(x) and g1(x), but only one of these gives a good description of g2(x). This fit requires the nucleon CST wave functions contain a large D-wave component (about 35%) and a small P-wave component (about 0.6%). The significance of these results is discussed.Comment: 27 pages; 13 figure

Towards the timely detection of toxicants

We address the problem of enhancing the sensitivity of biosensors to the influence of toxicants, with an entropy method of analysis, denoted as CASSANDRA, recently invented for the specific purpose of studying non-stationary time series. We study the specific case where the toxicant is tetrodotoxin. This is a very poisonous substance that yields an abrupt drop of the rate of spike production at t approximatively 170 minutes when the concentration of toxicant is 4 nanomoles. The CASSANDRA algorithm reveals the influence of toxicants thirty minutes prior to the drop in rate at a concentration of toxicant equal to 2 nanomoles. We argue that the success of this method of analysis rests on the adoption of a new perspective of complexity, interpreted as a condition intermediate between the dynamic and the thermodynamic state.Comment: 6 pages and 3 figures. Accepted for publication in the special issue of Chaos Solitons and Fractal dedicated to the conference "Non-stationary Time Series: A Theoretical, Computational and Practical Challenge", Center for Nonlinear Science at University of North Texas, from October 13 to October 19, 2002, Denton, TX (USA

Fixed-axis polarization states: covariance and comparisons

Addressing the recent criticisms of Kvinikhidze and Miller, we prove that the spectator wave functions and currents based on ``fixed-axis'' polarization states (previously introduced by us) are Lorentz covariant, and find an explicit connection between them and conventional direction-dependent polarization states. The discussion shows explicitly how it is possible to construct pure $S$-wave models of the nucleon.Comment: Changed title and introductory material to match accepted pape

Can Music Make You Sick? Mental health and working conditions in the UK music industry

In recent years there has been a growing body of research that has begun to examine the dark side of our relationship to music. The media understandably concentrate on the more sensational aspects of rock and roll; membership of ‘27 Club’, or the recent public declaration of critically acclaimed dubstep producer Benga as suffering from schizophrenia (Hutchinson, 2015). There is then a tension emerging between the notion that artistry is positive both for the economy and for well-being, and a growing awareness that a musical career is a risky business. ‘Can Music Make You Sick?’ surveyed over 2,200 musicians working in the United Kingdom, and interviewed more than 25 musicians and industry professionals, to explore how they are emotionally experiencing working in the music industry in the United Kingdom. This paper presents findings from this project, which seeks to ask challenging questions of music, and specifically musical ambition and aspirations, in the current climate of precarious labour and hyper competition. Is it possible that musical aspirations are potentially making artists sick

Can Music Make You Sick? Music and Depression

In recent years there has been a growing body of research that has begun to examine the dark side of our relationship to music. The media understandably concentrate on the more sensational aspects of rock and roll; membership of ‘27 Club’, or the recent public declaration of critically acclaimed dubstep producer Benga as suffering from schizophrenia (Hutchinson, 2015). There is then a tension emerging between the notion that artistry is positive both for the economy and for well-being, and a growing awareness that a musical career is a risky business. ‘Can Music Make You Sick?’ surveyed over 2,200 musicians working in the United Kingdom, and interviewed more than 25 musicians and industry professionals, to explore how they are emotionally experiencing working in the music industry in the United Kingdom. This paper presents findings from this project, which seeks to ask challenging questions of music, and specifically musical ambition and aspirations, in the current climate of precarious labour and hyper competition. Is it possible that musical aspirations are potentially making artists sick