We consider a Chaplygin gas model with an exponential potential in framework of braneworld inflation. We apply the slow-roll approximation in the high-energy limit to derive various inflationary spectrum perturbation parameters. We show that the inflation observables depend only on the e-folding number N and the final value of the slow-roll parameter e(end). Whereas for small running of the scalar spectral index dns/dlnk, the inflation observables are in good agreement with recent WMAP7 data.Comment: 5 pages, 3 figure

We consider a supersymmetric hybrid inflation in the framework of the Randall-Sundrum type II braneworld model. We derive an analytical expression for the scalar potential and find that the F-term dominates the hybrid inflation process. We show that, for some value of brane tension, we can eliminate the fine-tuning problem related to coupling constant κ of the potential. We also calculate all known spectrum inflation parameters and show that observational bounds from WMAP5, BAO and SN observations are satisfied.

We study a new inflation potential in the framework of the Randall-Sundrum type 2 Braneworld model. Using the technic developped in[1], we consider both an monomial and a new inflation potentials and apply the Slow-Roll approximation in high energy limit, to derive analytical expression of relevant perturabtion spectrum. We show that for some values of the parameter n of the potential) we obtain an perturbation spectrum wich present a good agreement with recent WMAP5 observations.

We are interested on studying various inflationary spectrum perturbation parameters in the context of the Randall-Sandrum type 2 Braneworld model. We consider in particular three types of potentials. We apply the slow-roll approximation in the high energy limit to constraint the parameter potentials by confronting our results to recent WMAP7 observations. We show that, for some values of the e-folding number N , the monomial potential provides the best fit results to observations data.

We consider a supersymmetric hybrid inflation in the framework of the RandallSundrum type-2 braneworld model. In particular, we study braneworld inflation in global supersymmetry with F-term and D-term. We show that we can solve partially the fine-tuning problem related to scalar fields coupling constants. We also derive all known spectrum inflationary parameters which are widely consistent with WMAP7, BAO and H 0 data, whereas the scalar spectral index n s > 0.98 which lies outside of the range allowed by observations.

We study F-term supergravity inflation in the framework of the Randall–Sundrum type-2 braneworld scenario. We consider a non-minimal Kähler potential and apply the slow-roll approximation in the high-energy limit to derive various perturbation spectrum parameters. We show that the η problem is solved for some coupling parameter values not allowed in standard inflation studied in Bastero-Gil et al (2007 Phys. Lett. B 651 345–51). Suitable observational values of ns are also obtained for some values of brane tension. We also calculate other spectrum inflation parameters and show that observational bounds from WMAP7, BAO and H0 data are satisfied.

We consider a Minimal Supersymmetric Standard Model (MSSM) inflation in the context of the Randall-Sundrum type-2 braneworld model. We apply the slow-roll approximations, in high-energy limit, to constraint various inflationary spectrum parameters in relation with recent WMAP9 data. We show that, for some values of the number of efolding N , the MSSM braneworld inflation provides the best fit results according to recent observations.

We study various tachyonic inflationary spectrum perturbations in the context of the Randall–Sundrum type-2 braneworld model [L. Randall and R. Sundrum, Phys. Rev. Lett.83, 3370 (1999); Phys. Rev. Lett.83, 4690 (1999)]. We consider, in particular, the inverse power law potential [Formula: see text] of the tachyonic field in the high-energy and slow-roll approximations using the recent astronomical observations.