101 citations · 826 across the 67 of their papers we have counts for
5 papers · 1 filter
A massive warm baryonic halo in the Coma cluster
M. Bonamente, M. K. Joy, R. Lieu
Several deep PSPC observations of the Coma cluster reveal a very large-scale halo of soft X-ray emission, substantially in excess of the well known radiation from the hot intra-clu…
Stringent limits on the existence of Planck time from stellar interferometry
Richard Lieu, Lloyd W. Hillman
We present a method of directly testing whether time is `grainy' on scales of <= t_P = (hbar G/c^5)^0.5 ~ 5.4E-44 s, the Planck time. If the phenomenon exists, the energy and momen…
Low-energy X-ray emission from the Abell 2199 cluster of galaxies
Jelle S. Kaastra, Richard Lieu, Johan A. M. Bleeker +2
In a recent Letter, Berghoefer & Bowyer rediscussed the analysis of BeppoSAX LECS data of the cluster of galaxies Abell 2199 as presented by Kaastra et al., in particular the detec…
The extreme ultraviolet excess emission in five clusters of galaxies revisited
Florence Durret, Eric Slezak, Richard Lieu +2
Evidence for excess extreme ultraviolet (EUV) emission over a tail of X-ray gas bremsstrahlung emission has been building up recently, but in some cases remains controversial, most…
The effect of Planck scale space time fluctuations on Lorentz invariance at extreme speeds
Richard Lieu
The starting point of this work is the axiomatic existence of a smallest measurable interval, viz. the Planck time , set by quantum fluctuations in the vacuum metric tensor. B…