Year: 2006
Type: article
Abstract: Essentially all of our knowledge of the acceleration history of the universe (even the discovery of the acceleration itself) is predicated on the validity of general relativity through the Friedmann equation. Assuming only a flat spacetime that is homogenous and isotropic on large scales and described by a metric theory of gravity, we use SNe Ia to analyze the acceleration history. We infer robust conclusions about cosmic acceleration that are independent of a particular parameterization of the acceleration history. Specifically, we find (1) very strong (5 σ) evidence for a period of acceleration, (2) strong evidence that the acceleration has not been constant, (3) evidence for an earlier period of deceleration, and (4) only weak evidence that the universe has been accelerating since z ~ 0.3.
Source: The Astrophysical Journal
DOI: 10.1086/506470
Authors: Charles Shapiro, Michael S. Turner
Institution: University of Chicago
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1977226582