On the nature of the fourth generation neutrino and its implications

We consider the neutrino sector of a Standard Model with four generations. While the three light neutrinos can obtain their masses from a variety of mechanisms with or without new neutral fermions, fourth-generation neutrinos need at least one new relatively light right-handed neutrino. If lepton number is not conserved this neutrino must have a Majorana mass term whose size depends on the underlying mechanism for lepton number violation. Majorana masses for the fourth generation neutrinos induce relative large two-loop contributions to the light neutrino masses which could be even larger than the cosmological bounds. This sets strong limits on the mass parameters and mixings of the fourth generation neutrinos.Comment: To be published. Few typos corrected, references update

Reflecting on the study of psychoanalysis, culture and society: the development of a psycho-cultural approach

This article discusses the development of a psycho-cultural approach that brings together object relations psychoanalysis and cultural studies to explore the psycho-dynamics of culture, politics and society. While foregrounding the work of Donald Winnicott and other psychoanalysts influenced by his ideas, I contextualise that approach by tracing my own relationship to the study of psychoanalysis and culture since I was a Cultural Studies student in the 1980s and 1990s and also my engagement with the psychoanalytic scene that existed in London at that time. I have since applied a psycho-cultural lens to the study of masculinity and emotion in cinema and more recently to the study of emotion and political culture in Europe and the US. The article provides an example of that work by discussing the populist appeal of Donald Trump in the US and Nigel Farage in the UK, where the contradictory dynamics of attachment, risk and illusion are present when communicating with their supporters and the general publi

The glenoid in total shoulder arthroplasty

Management of glenohumeral arthrosis with a total shoulder prosthesis is becoming increasingly common. However, failure of the glenoid component remains one of the most common causes for failure. Our understanding of this problem has evolved greatly since the first implants were placed in the 1970’s. However glenoid failure remains a challenging problem to address and manage. This article reviews the current knowledge regarding the glenoid in total shoulder arthroplasty touching on anatomy, component design, implant fixation, causes of implant failure, management of glenoid failure and alternatives to glenoid replacement