Viable inhomogeneous model universe without dark energy from primordial inflation

TL;DR

This paper proposes a new inhomogeneous universe model based on primordial inflation, explaining supernova observations without dark energy and predicting an older universe consistent with structure formation.

Contribution

It introduces a viable inhomogeneous bubble universe model derived from Einstein equations, challenging the need for dark energy in explaining cosmic acceleration.

Findings

No cosmic acceleration inferred from the model

Predicted universe age of approximately 15.3 Gyr

Larger luminosity distances consistent with supernova data

Abstract

A new model of the observed universe, using solutions to the full Einstein equations, is developed from the hypothesis that our observable universe is an underdense bubble, with an internally inhomogeneous fractal bubble distribution of bound matter systems, in a spatially flat bulk universe. It is argued on the basis of primordial inflation and resulting structure formation, that the clocks of the isotropic observers in average galaxies coincide with clocks defined by the true surfaces of matter homogeneity of the bulk universe, rather than the comoving clocks at average spatial positions in the underdense bubble geometry, which are in voids. This understanding requires a systematic reanalysis of all observed quantities in cosmology. I begin such a reanalysis by giving a model of the average geometry of the universe, which depends on two measured parameters: the present matter density parameter, Omega_m, and the Hubble constant, H_0. The observable universe is not accelerating. Nonetheless, inferred luminosity distances are larger than naively expected, in accord with the evidence of distant type Ia supernovae. The predicted age of the universe is 15.3 +/-0.7 Gyr. The expansion age is larger than in competing models, and may account for observed structure formation at large redshifts.