Now showing items 1-3 of 3

    • Limits on spacetime foam 

      Christiansen, Wayne A.; Ng, Yeejack; Floyd, David J. E.; Perlman, Eric S. (2011-04-04)
      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 images of distant quasars and active galactic ...
    • NEW CONSTRAINTS ON QUANTUM GRAVITY FROM X-RAY AND GAMMA-RAY OBSERVATIONS 

      PERLMAN, ERIC S.; Rappaport, Saul A.; Christiansen, Wayne A.; Ng, Yeejack; Devore, John G.; Pooley, David A. (2015-05-20)
      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 α, which parameterizes the rate at which Planck-scale ...
    • Using observations of distant quasars to constrain quantum gravity 

      Perlman, Eric S.; Ng, Yeejack; Floyd, David J.E.; Christiansen, Wayne A. (2011-11-23)
      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. (2011, A&A, 533, A71) which claims that Hubble Space Telescope (HST) observations ...