Averaged Lemaitre-Tolman-Bondi dynamics

作者：Chirinos Isidro Eddy G; Barbosa Rodrigo M; Piattella Oliver F; Zimdahl Winfried

来源：Classical and Quantum Gravity, 2017, 34(3): 035001.

DOI：10.1088/1361-6382/34/3/035001

• inhomogeneous cosmological models
• averaging
• backreaction

We consider cosmological backreaction effects in Buchert's averaging formalism on the basis of an explicit solution of the Lemaitre-Tolman-Bondi (LTB) dynamics which is linear in the LTB curvature parameter and has an inhomogeneous bang time. The volume Hubble rate is found in terms of the volume scale factor which represents a derivation of the simplest phenomenological solution of Buchert's equations in which the fractional densities corresponding to average curvature and kinematic backreaction are explicitly determined by the parameters of the underlying LTB solution at the boundary of the averaging volume. This configuration represents an exactly solvable toy model but it does not adequately describe our 'real' Universe.

• 出版日期2017-2-9