# relativity

- Research ArticleConstancy of the cluster gas mass fraction in the
*R*_{h}=*ct*Universe17 February 2016 - Research Article Observables in terms of connection and curvature variables for Einstein’s equations with two commuting Killing vectors11 November 2015
- Research Article Locally covariant quantum field theory and the problem of formulating the same physics in all space–times29 June 2015