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R. A. Isaacson, “Gravitational Radiation in the Limit of High Frequency. I. The Linear Approximation and Geo- metrical Optics,” Physical Reviews, Vol. 166, No. 5, 1968, pp. 1263-1272. doi:10.1103/PhysRev.166.1263

has been cited by the following article:

• TITLE: Unimodular Gravity and Averaging

  AUTHORS: Alan Coley, Johan Brannlund, Joey Latta

  KEYWORDS: Inhomogeneous Cosmology; Averaging; Unimodular Gravity

  JOURNAL NAME: Journal of Modern Physics, Vol.3 No.3, March 28, 2012

  ABSTRACT: The question of the averaging of inhomogeneous spacetimes in cosmology is important for the correct interpretation of cosmological data. In this paper a conceptually simpler approach to averaging in cosmology is suggested, based on the averaging of scalars within unimodular gravity. As an illustration, the example of an exact spherically symmetric dust model is considered, and it is shown that within this approach averaging introduces correlations (corrections) to the effective dynamical evolution equation in the form of a spatial curvature term.