43 citations · 182 across the 7 of their papers we have counts for
7 papers
New constraints on quantum foam models from X-ray and gamma-ray observations of distant quasars
Eric S. Perlman, Saul A. Rappaport, Y. Jack Ng +3
Astronomical observations of distant quasars may be important to test models for quantum gravity, which posit Planck-scale spatial uncertainties ('spacetime foam') that would produ…
New Constraints on Quantum Gravity from X-ray and Gamma-Ray Observations
Eric S. Perlman, Saul A. Rappaport, Wayne A. Christensen +3
One aspect of the quantum nature of spacetime is its "foaminess" at very small scales. Many models for spacetime foam are defined by the accumulation power , which parameterizes…
Using Observations of Distant Quasars to Constrain Quantum Gravity
Eric S. Perlman, Y. Jack Ng, David J. E. Floyd +1
Aims. The small-scale nature of spacetime can be tested with observations of distant quasars. We comment on a recent paper by Tamburini et al. (A&A, 533, 71) which claims that Hubb…
Limits on Spacetime Foam
Wayne A. Christiansen, David J. E. Floyd, Y. Jack Ng +1
Plausibly spacetime is "foamy" on small distance scales, due to quantum fluctuations. We elaborate on the proposal to detect spacetime foam by looking for seeing disks in the image…
Redshifts and Velocity Dispersions of Galaxy Clusters in the Horologium-Reticulum Supercluster
M. C. Fleenor, J. A. Rose, W. A. Christiansen +4
We present 118 new optical redshifts for galaxies in 12 clusters in the Horologium-Reticulum supercluster (HRS) of galaxies. For 76 galaxies, the data were obtained with the Dual B…
Large-Scale Velocity Structures in the Horologium-Reticulum Supercluster
M. C. Fleenor, J. A. Rose, W. A. Christiansen +4
We present 547 optical redshifts obtained for galaxies in the region of the Horologium-Reticulum Supercluster (HRS) using the 6dF multi-fiber spectrograph on the UK Schmidt Telesco…
Multiple Merging Events in the Double Cluster A3128/A3125
J. A. Rose, A. E. Gaba, W. A. Christiansen +4
Multi-fiber spectroscopy has been obtained for 335 galaxies in the field of the double cluster A3128/A3125, using the 2dF multi-fiber positioner on the AAT. A total of 532 objects…