Lagrange perturbation and averaging of a general relativistic inhomogeneous universe

Details Lagrange perturbation and averaging of a general relativistic inhomogeneous universe Lagrange perturbation and averaging of a general relativistic inhomogeneous universe

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1241..708a&link_type=abstract

INVISIBLE UNIVERSE: Proceedings of the Conference. AIP Conference Proceedings, Volume 1241, pp. 708-713 (2010).

Physics

Fluid Dynamics

Cosmology, Fluid Dynamics, Universe, Geodesy, Gravity, Origin And Formation Of The Universe, Flow Visualization And Imaging, Particle-Theory And Field-Theory Models Of The Early Universe, Geodesy And Gravity, Gravitational Fields

Scientific paper

In the framework of general relativity, we discuss Lagrange perturbation approach to describe locally nonlinear inhomogeneities in a globally FLRW-like universe, in which we assume two cases: only the dust matter and a matter accompanied with pressure. Next, we discuss apparent discrepancies among a lot of works on effects of the nonlinear backreaction. By defining the spatially averaged matter energy density as a conserved quantity in the large comoving volume, it is shown that the nonlinear backreaction neither accelerates nor decelerates the cosmic expansion in a matter-dominated universe.

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