Browsing College of Arts and Sciences by Subject "Dark energy"

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Browsing College of Arts and Sciences by Subject "Dark energy"

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  • Pavlov, Anatoly; Samushia, Lado; Ratra, Bharat V. (2012)
    The next generation of space-based galaxy surveys is expected to measure the growth rate of structure to a level of about one percent over a range of redshifts. The rate of growth of structure as a function of redshift ...
  • Chen, Y.; Ratra, Bharat V. (2012)
    We use angular size versus redshift data for galaxy clusters provided by Bonamente and collaborators to place constraints on model parameters of constant and time-evolving dark energy cosmological models. These constraints ...
  • Farooq, Omer; Mania, Data; Ratra, Bharat V. (2013)
    We use 21 Hubble parameter versus redshift data points, from Simon et al. (2005), Gazta~naga et al. (2009), Stern et al. (2010), and Moresco et al. (2012a), to place constraints on model parameters of constant and time-evolving ...
  • Pavlov, Anatoly; Westmoreland, Shawn; Saaidi, Khaled; Ratra, Bharat V. (2013)
    We generalize the time-variable dark energy scalar field Φ model (ΦCDM) to nonflat space. We show that even in the space-curvature-dominated epoch the scalar field solution is a time-dependent fixed point or attractor, ...