Description of our cosmological spacetime as a perturbed conformal Newtonian metric and implications for the backreaction proposal for the accelerating universe

作者：Kolb Edward W^*; Marra Valerio; Matarrese Sabino

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, 78(10): 103002.

DOI：10.1103/PhysRevD.78.103002

It has been argued that the spacetime of our universe can be accurately described by a perturbed conformal Newtonian metric, and hence even large density inhomogeneities in a dust universe cannot change the observables predicted by the homogeneous dust model. In this paper we study a spherically symmetric dust model and illustrate conditions under which large spatial variations in the expansion rate can invalidate the argument.

• 出版日期2008-11