Relational particle models as toy models for quantum gravity and quantum cosmology

It is argued that substantial portions of both Newtonian particle mechanics and general relativity can be viewed as relational (rather than absolute) theories. I furthermore use the relational particle models as toy models to investigate the problem of time in closed-universe canonical quantum general relativity. I consider thus in particular the internal time, semiclassical and records tentative resolutions of the problem of time.Comment: Talk at Einstein centenary conference, Paris. Minor update with reference

Criminal Minded? : Mixtape DJs, The Piracy Paradox, and Lessons for the Recording Industry

For at least the past three years, leading American fashion designers have lobbied for passage of copyright-like protection for the design aspects of their apparel creations. For at least as long, the recorded music industry has been engaged in an aggressive campaign to enforce its copyrights in recorded music against a number of technology-enabled and/or culturally sympathetic alleged infringers, including twelve year-olds and grandmothers. Although the record labels already have protection under the copyright law while the fashion houses seek it, they have at least one thing in common: some portion of the piracy that they seek to eradicate is more valuable to them than they publicly let on. In their recent article The Piracy Paradox: Innovation and Intellectual Property in Fashion Design, Kal Raustiala and Chris Sprigman explore the low-IP equilibrium of the fashion design industry, as well as the unexpected value created by a low-protection regime. One might ask whether there is anything wrong with chilling an unlawful activity such as large-scale copyright infringement. The article argues that there is something wrong with such a result, but that the owners of the copyright in the recordings either fail to appreciate the problem or fail to account for the problem in executing their enforcement strategy. Hip-hop mixtape DJs are engaged in productive infringement – infringing activity or improper appropriation that adds value to the infringed asset, rather than leading to losses for the copyright owner. Dealing with such infringement requires an approach different from typical recording industry tactics. This article argues that, in order to preserve and enhance the value of their own assets, the record labels should practice strategic forbearance

Risky drinking patterns are being continued into pregnancy: a prospective cohort study

Background: Risky patterns of alcohol use prior to pregnancy increase the risk of alcohol-exposed pregnancies and subsequent adverse outcomes. It is important to understand how consumption changes once women become pregnant. Objective: The aim of this study was to describe the characteristics of women that partake in risky drinking patterns before pregnancy and to examine how these patterns change once they become pregnant. Methods: A sample of 1577 women from the 1973–78 cohort of the Australian Longitudinal Study on Women’s Health were included if they first reported being pregnant in 2000, 2003, 2006, 2009 and reported risky drinking patterns prior to that pregnancy. Multinomial logistic regression was used to determine which risky drinking patterns were most likely to continue into pregnancy. Results: When reporting risky drinking patterns prior to pregnancy only 6% of women reported weekly drinking only, whereas 46% reported binge drinking only and 48% reported both. Women in both binge categories were more likely to have experienced financial stress, not been partnered, smoked, used drugs, been nulliparous, experienced a violent relationship, and were less educated. Most women (46%) continued these risky drinking patterns into pregnancy, with 40% reducing these behaviors, and 14% completely ceasing alcohol consumption. Once pregnant, women who binged only prior to pregnancy were more likely to continue (55%) rather than reduce drinking (29%). Of the combined drinking group 61% continued to binge and 47% continued weekly drinking. Compared with the combined drinking group, binge only drinkers prior to pregnancy were less likely to reduce rather than continue their drinking once pregnant (OR = 0.37, 95% CI = 0.29, 0.47). Conclusions: Over a third of women continued risky drinking into pregnancy, especially binge drinking, suggesting a need to address alcohol consumption prior to pregnancy. Alexis J. Hure, Peta M. Forder, Jennifer Powers, Frances J. Kay-Lambkin, Deborah J. Loxto