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PIRSA:07050037

Video URL

https://pirsa.org/07050037

Nonlinear Structure Formation and Apparent Acceleration: An Investigation

          @misc{ scivideos_PIRSA:07050037,
            doi = {10.48660/07050037},
            url = {https://pirsa.org/07050037},
            author = {Notari, Alessio},
            keywords = {Cosmology},
            language = {en},
            title = {Nonlinear Structure Formation and Apparent Acceleration: An Investigation},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2007},
            month = {may},
            note = {PIRSA:07050037 see, \url{https://scivideos.org/index.php/pirsa/07050037}}
          }

Alessio Notari

Talk numberPIRSA:07050037
DOI10.48660/07050037
Source RepositoryPIRSA
Collection
Talk Type Conference
Subject

Abstract

We present analytically solvable nonlinear models of structure formation in a Universe with only dust, using LTB solutions. We show that the luminosity distance-redshift relation has significant corrections at low redshift (Doppler effect). We discuss different possibilities that could further enhance this effect and mimick Dark Energy. We find negligible integrated effect, suppressed by $(L/R_{H})^3$ (where $L$ is the size of the structure, and $R_{H}$ is the Hubble radius) and we make contact with cosmological perturbation theory.