Observational Constraints on the Chaplygin Gas with Inverse Power Law Potential in Braneworld Inflation

Primordial perturbations and inflation in a holography inspired Gauss-Bonnet cosmology

“…Using the definition (41) we can express the remaining perturbation equations in terms of Φ only. Then, by making use of the definitions ( 31) and ( 32) from (A21) and (A22) we obtain…”

“…To make a comparison with observation, e.g., to plot r versus n S , we need to specify a model. A model which can be easily treated is the tachyon condensate [33] which has been extensively studied in the context of inflation [26,[34][35][36][37][38][39][40][41][42][43]. Tachyon models are of particular interest as in these models inflation is driven by the tachyon field originating in M or string theory.…”

Tachyon inflation in the holographic braneworld

“…The origin of the field that drives inflation is still unknown and is subject to speculations. Among many models of inflation a popular class comprise tachyon inflation models [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Tachyon models are of particular interest as in these models inflation is driven by the tachyon field originating in M or string theory.…”

“…12) is the spatial line element for a closed (k = 1), open hyperbolic (k = −1), or open flat (k = 0) space. Assuming an AdS Schwarzschild geometry in the bulk one obtains[18,19,47] …”