Le contenu de cette page n’est pas disponible en français. Veuillez nous en excuser.

Nonlinear Structure Formation and Apparent Acceleration: An Investigation

Playing this video requires the latest flash player from Adobe.

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.