Browsing Physics and Astronomy by Subject "Nongalactic Astrophysics"

Now showing items 1-2 of 2

    • Consequences of using a smooth cosmic distance in a lumpy Universe. I. 

      Umeh, Obinna (American Physical Society, 2022)
      How do we appropriately fit a model based on an idealised Friedmann-Lemaˆıtre Robertson-Walker spacetime to observations made from a single location in a lumpy Universe? We address this question for surveys that measure ...

    • Nonlinear modulation of the HI power spectrum on ultra-large scales. I 

      Umeh, Obinna; Maartens, Roy; Santos, Mario G. (IOP Science, 2015)
      Intensity mapping of the neutral hydrogen brightness temperature promises to provide a three-dimensional view of the universe on very large scales. Nonlinear effects are typically thought to alter only the small-scale ...