Talk detail

Participant	Bochner, Brett
Institution	Hofstra University - Hempstead Turnpike - Hempstead - NY - USA

Session	TC3	Accepted		Order	Time
Talk	Oral abstract	Title	Apparent Acceleration and an Alternative Concordance from Causal Backreaction
Co-authors
Abstract	A phenomenological formalism is presented in which the apparent acceleration of the universe is generated by cosmic structure formation, without resort to Dark Energy, modifications to gravity, or a local void. The observed acceleration results from the combined effect of innumerable local perturbations due to individually virializing systems, overlapping together in a smoothly-inhomogeneous adjustment of the FRW metric, in a process governed by the causal flow of inhomogeneity information outward from each clumped system. After discussion of how common arguments claiming to limit backreaction are physically unrealistic, models are presented which fit the supernova luminosity distance data essentially as well as LambdaCDM, while bringing several important cosmological parameters to within range of their Concordance values.