2016/04/30 by J. Gegenberg, Jack Gegenberg, Shohreh Rahmati +1 · 9 citations
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Astronomy #Black Holes and Theoretical Physics #Conformal map #Cosmology #Cosmology and Gravitation Theories #Dark energy #Economics #Geometry #Geophysics and Gravity Measurements #Inflation (cosmology) #Keynesian economics #Mathematics #Physics #Theoretical physics #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.95.043509
published in Physical review. D/Physical review. D. 95(4) (American Physical Society) · 8 pages, 3 figures, references added, version matches the one published in PRD
openalex publication_date 2017/02/13 · arxiv created 2017/05/01 · arxiv updated 2017/05/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08
We examine the cosmological sector of a gauge theory of gravity based on the SO(4,2) conformal group of Minkowski space. We allow for conventional matter coupled to the spacetime metric as well as matter coupled to the field that gauges special conformal transformations. An effective vacuum energy appears as an integration constant, and this allows us to recover the late time acceleration of the Universe. Furthermore, gravitational fields sourced by ordinary cosmological matter (i.e. dust and radiation) are significantly weakened in the very early Universe, which has the effect of replacing the big bang with a big bounce. Finally, we find that this bounce is followed by a period of nearly exponential slow roll inflation that can last long enough to explain the large scale homogeneity of the cosmic microwave background.