# relativity

- Research Article Constancy 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 On the initial value problem for the wave equation in Friedmann–Robertson–Walker space–times16 July 2014
- 27 November 2013
- Article Commentary A note on ‘Einstein's special relativity beyond the speed of light by James M. Hill and Barry J. Cox’20 March 2013