Comments on the tethered galaxy problem

In a recent paper Davis et al. make the counter intuitive assertion that a galaxy held `tethered' at a fixed distance from our own could emit blueshifted light. Moreover, this effect may be derived from the simplest Friedmann-Robertson-Walker spacetimes and the (0.3,0.7) case which is believed to be a good late time model of our own universe. In this paper we recover the previous authors' results in a more transparent form. We show how their results rely on a choice of cosmological distance scale and revise the calculations in terms of observable quantities which are coordinate independent. By this method we see that, although such a tethering would reduce the redshift of a receding object, it would not do so sufficiently to cause the proposed blueshift. The effect is also demonstrated to be much smaller than conjectured below the largest intergalactic scales. We also discuss some important issues, raised by this scenario, relating to the interpretation of redshift and distance in relativistic cosmology.Comment: 6 pages, 3 figures, submitted to Am.J.Phy

The socio-economic boundaries shaping young people’s lunchtime food practices on a school day

This is the peer reviewed version of the following article: Wendy J. Wills, Giada Danesi, Ariadne B. Kapetanaki, and Laura K. Hamilton, ‘The Socio‐Economic Boundaries Shaping Young People's Lunchtime Food Practices on a School Day’, Children & Society, Vol. 32 (3): 195-206, May 2018, which has been published in final form at https://doi.org/10.1111/chso.12261. Under embargo until 6 April 2019. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.Not enough is known about the relationship between socio-economic deprivation and places where young people purchase food at lunchtime on a school day. This paper draws on qualitative data from 600+ young people aged 13-15 years and illustrates that socio-economic factors form boundaries that young people have a feeling for when buying food. This informs where they seek out lunch (at school or in local food outlets) and what products, service and prices they access and find acceptable. Such insights help to understand why inequalities in young people’s health and eating practices prevail.Peer reviewedFinal Accepted Versio

Survived so what?: identifying priorities for research with children and families post-paediatric intensive care unit

The involvement of patients and the public in the development, implementation and evaluation of health care services and research is recognized to have tangible benefits in relation to effectiveness and credibility. However, despite >96% of children and young people surviving critical illness or injury, there is a paucity of published reports demonstrating their contribution to informing the priorities for aftercare services and outcomes research. We aimed to identify the service and research priorities for Paediatric Intensive Care Unit survivors with children and young people, their families and other stakeholders. We conducted a face‐to‐face, multiple‐stakeholder consultation event, held in the Midlands (UK), to provide opportunities for experiences, views and priorities to be elicited. Data were gathered using write/draw and tell and focus group approaches. An inductive content analytical approach was used to categorize and conceptualize feedback. A total of 26 individuals attended the consultation exercise, including children and young people who were critical care survivors; their siblings; parents and carers; health professionals; academics; commissioners; and service managers. Consultation findings indicated that future services, interventions and research must be holistic and family‐centred. Children and young people advisors reported priorities that focused on longer‐term outcomes, whereas adult advisors identified priorities that mapped against the pathways of care. Specific priorities included developing and testing interventions that address unmet communication and information needs. Furthermore, initiatives to optimize the lives and longer‐term functional and psycho‐social outcomes of Paediatric Intensive Care Unit survivors were identified. This consultation exercise provides further evidence of the value of meaningful patient and public involvement in identifying the priorities for research and services for Paediatric Intensive Care Unit survivors and illuminates differences in proposed priorities between children, young people and adult advisors

'I was excited by the idea of a project that focuses on those unasked questions' Co-producing disability research with disabled young people

In this article, we detail the politics and practicalities of co‐produced disability research with disabled young people with life‐limiting and life‐threatening impairments. We centre an ESRC‐funded arts‐informed co‐produced research project that has brought together a Co‐Researcher Collective of disabled young people. Co‐production is an established approach; however, our co‐researchers have led us to develop inclusive research practices that engage with online social research methods in innovative ways. As we detail our experiences, we aim to encourage disability studies researchers and others to adopt virtual environments when researching with and for the lives of disabled people

Calculations of photo-ionization cross sections for diatomic molecules

Thesis (M.Sc.) -- University of Adelaide, Dept. of Mathematical Physics, 196