Holography in the EPRL Model

In this research announcement, we propose a new interpretation of the EPR quantization of the BC model using a functor we call the time functor, which is the first example of a CLa-ren functor. Under the hypothesis that the universe is in the Kodama state, we construct a holographic version of the model. Generalisations to other CLa-ren functors and connections to model category theory are considered.Comment: research announcement. Latex fil

Social and spatial heterogeneity in psychosis proneness in a multilevel case-prodrome-control study

To test whether spatial and social neighbourhood patterning of people at ultra-high risk (UHR) of psychosis differs from first-episode psychosis (FEP) participants or controls and to determine whether exposure to different social environments is evident before disorder onset

From Dimensional Reduction of 4d Spin Foam Model to Adding Non-Gravitational Fields to 3d Spin Foam Model

A Kaluza-Klein like approach for a 4d spin foam model is considered. By applying this approach to a model based on group field theory in 4d (TOCY model), and using the Peter-Weyl expansion of the gravitational field, reconstruction of new non gravitational fields and interactions in the action are found. The perturbative expansion of the partition function produces graphs colored with su(2) algebraic data, from which one can reconstruct a 3d simplicial complex representing space-time and its geometry; (like in the Ponzano-Regge formulation of pure 3d quantum gravity), as well as the Feynman graph for typical matter fields. Thus a mechanism for generation of matter and construction of new dimensions are found from pure gravity.Comment: 11 pages, no figure, to be published in International Journal of Geometric Methods in Modern Physic

Does the addition of a supportive chatbot promote user engagement with a smoking cessation app? An experimental study

Does the addition of a supportive chatbot promote user engagement with a smoking cessation app? An experimental study Show all authors Olga Perski, David Crane, Emma Beard, ... First Published September 30, 2019 Research Article https://doi.org/10.1177/2055207619880676 Article information Article has an altmetric score of 27 Open AccessCreative Commons Attribution 4.0 License Abstract Objective The objective of this study was to assess whether a version of the Smoke Free app with a supportive chatbot powered by artificial intelligence (versus a version without the chatbot) led to increased engagement and short-term quit success. Methods Daily or non-daily smokers aged ≥18 years who purchased the ‘pro’ version of the app and set a quit date were randomly assigned (unequal allocation) to receive the app with or without the chatbot. The outcomes were engagement (i.e. total number of logins over the study period) and self-reported abstinence at a one-month follow-up. Unadjusted and adjusted negative binomial and logistic regression models were fitted to estimate incidence rate ratios (IRRs) and odds ratios (ORs) for the associations of interest. Results A total of 57,214 smokers were included (intervention: 9.3% (5339); control: 90.7% (51,875). The app with the chatbot compared with the standard version led to a 101% increase in engagement (IRRadj = 2.01, 95% confidence interval (CI) = 1.92–2.11, p < .001). The one-month follow-up rate was 10.6% (intervention: 19.9% (1,061/5,339); control: 9.7% (5,050/51,875). Smokers allocated to the intervention had greater odds of quit success (missing equals smoking: 844/5,339 vs. 3,704/51,875, ORadj = 2.38, 95% CI = 2.19–2.58, p < .001; follow-up only: 844/1,061 vs. 3,704/5,050, ORadj = 1.36, 95% CI = 1.16–1.61, p < .001). Conclusion The addition of a supportive chatbot to a popular smoking cessation app more than doubled user engagement. In view of very low follow-up rates, there is low quality evidence that the addition also increased self-reported smoking cessation

Short report: Autistic parents’ views and experiences of talking about autism with their autistic children

Little is known about how parents talk about autism with their autistic children, particularly among families in which both a parent and child are autistic. Using an online survey, we gathered quantitative and qualitative data from 34 autistic parents (most of whom had told their children about their diagnosis) to address this knowledge gap. There was considerable overlap between the views and experiences of the autistic parents in this study and the largely non-autistic parent samples in previous research. Specifically, parents emphasised the importance of being open and honest about the diagnosis, disclosing the diagnosis as early as possible, individualising discussions to children’s needs and framing the diagnosis positively. There were, however, areas in which the views and experiences of the current sample differed from previous research on non-autistic samples. First, our sample of autistic parents outlined the benefits of their own experiential expertise, which they felt resulted in heightened understanding and empathy with their children. Second, our sample tended not to express concerns about disclosure potentially having a negative impact. Finally, our participants did not express a want or need for professional support with disclosure. Instead, they reported feeling well equipped to support their children using their own knowledge and lived experience

Participatory autism research: early career and established researchers’ views and experiences

Despite more autism research taking place than ever before, there is a disconnect between the current landscape of autism research and what autistic people and their allies want from research. While participatory research has been proposed as a potential solution, we know little about how researchers (particularly, early career researchers) employ this approach. We interviewed 25 researchers (14 early career and 11 established researchers) about their views and experiences of participatory autism research. Through reflexive thematic analysis of interview and focus group data, we identified three themes. First, our participants emphasised the flexible nature of participatory research, and the many forms it can take; yet noted that this flexibility could cause confusion. Second, our participants highlighted the importance of building relationships with research partners, while commenting on the challenges around effective communication and working with diverse groups of people who may have limited research experience. Finally, participants described the challenges of working within academic environments that are not conducive to participatory research (e.g. due to limited time, funding and support). We discuss these issues with regard to changes required at both an individual and systemic level, ensuring that efforts are made to meaningfully involve autistic people and their allies in all stages of the research process

Stellar Kinematics of the Double Nucleus of M31

We report observations of the double nucleus of M31 with the f/48 long-slit spectrograph of the HST Faint Object Camera. We obtain a total exposure of 19,000 sec. over 7 orbits, with the 0.063-arcsec-wide slit along the line between the two brightness peaks (PA 42). A spectrum of Jupiter is used as a spectral template. The rotation curve is resolved, and reaches a maximum amplitude of ~250 km/s roughly 0.3 arcsec either side of a rotation center lying between P1 and P2, 0.16 +/- 0.05 arcsec from the optically fainter P2. We find the velocity dispersion to be < 250 km/s everywhere except for a narrow ``dispersion spike'', centered 0.06 +/- 0.03 arcsec on the anti-P1 side of P2, in which sigma peaks at 440 +/- 70 km/s. At much lower confidence, we see local disturbances to the rotation curve at P1 and P2, and an elevation in sigma at P1. At very low significance we detect a weak asymmetry in the line-of-sight velocity distribution opposite to the sense usually encountered. Convolving our V and sigma profiles to CFHT resolution, we find good agreement with the results of Kormendy & Bender (1998, preprint), though there is a 20% discrepancy in the dispersion that cannot be attributed to the dispersion spike. Our results are not consistent with the location of the maximum dispersion as found by Bacon et al. We find that the sinking star cluster model of Emsellem & Combes (1997) does not reproduce either the rotation curve or the dispersion profile. The eccentric disk model of Tremaine (1995) fares better, and can be improved somewhat by adjusting the original parameters. However, detailed modeling will require dynamical models of significantly greater realism.Comment: 29 pages, Latex, AASTeX v4.0, with 7 eps figures. To appear in The Astronomical Journal, February 199

NGC 1866: First Spectroscopic Detection of Fast Rotating Stars in a Young LMC Cluster

High-resolution spectroscopic observations were taken of 29 extended main sequence turn-off (eMSTO) stars in the young ($\sim$200 Myr) LMC cluster, NGC 1866 using the Michigan/Magellan Fiber System and MSpec spectrograph on the Magellan-Clay 6.5-m telescope. These spectra reveal the first direct detection of rapidly rotating stars whose presence has only been inferred from photometric studies. The eMSTO stars exhibit H-alpha emission (indicative of Be-star decretion disks), others have shallow broad H-alpha absorption (consistent with rotation $\gtrsim$150 km s$^{-1}$), or deep H-alpha core absorption signaling lower rotation velocities ($\lesssim$150 km s$^{-1}$ ). The spectra appear consistent with two populations of stars - one rapidly rotating, and the other, younger and slowly rotating.Comment: 9 pages, 4 figures, Accepted for publication in ApJ Letter