Mirage Inflation

          @misc{ scivideos_PIRSA:06050000,
            doi = {10.48660/06050000},
            url = {https://pirsa.org/06050000},
            author = {Germani, Cristiano},
            keywords = {Cosmology},
            language = {en},
            title = {Mirage Inflation},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2006},
            month = {may},
            note = {PIRSA:06050000 see, \url{https://scivideos.org/pirsa/06050000}}
          }
          

Abstract

A cosmological model based on an inhomogeneous D3-brane moving in an AdS_5 X S_5 bulk is introduced. Although there is no special points in the bulk, the brane Universe has a center and is isotropic around it. The model has an accelerating expansion and its effective cosmological constant is inversely proportional to the distance from the center, giving a possible geometrical origin for the smallness of a present-day cosmological constant. Besides, if our model is considered as an alternative of early time acceleration, it is shown that the early stage accelerating phase ends in a dust dominated FRW homogeneous Universe. Mirage-driven acceleration thus provides a dark matter component for the brane Universe final state. We finally show that the model fulfills the current constraints on inhomogeneities.