Boundary inflation and the WMAP data
(2006) Physical Review. D, Particles, Fields, Gravitation and Cosmology — Vol. 73, n° 6, p. 064035 [23 pages] (2006)
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- Abstract
- Inflation in a five-dimensional brane world model with two boundary branes is studied. We make use of the moduli space approximation whereby the low energy theory reduces to a four-dimensional biscalar-tensor gravity plus a minimally coupled scalar field. After a detailed analysis of the inflationary solutions, we derive the evolution equations of the linear perturbations separating the adiabatic mode from two entropy modes. We then examine the primordial scalar and tensor power spectra and show that their tilt depends on the scalar-tensor coupling constant. Finally, the induced cosmic microwave background (CMB) anisotropies are computed and we present a Monte Carlo Markov chains exploration of the parameter space using the first year WMAP data. We find a marginalized probability bound for the associated Eddington parameter at the end of inflation 1-γ<2×10-3, at 95% confidence level. This suggests that future CMB data could provide crucial information helping to distinguish scalar-tensor and standard inflationary scenarios.
- Affiliations
Service de Physique Théorique, Commissariat à l’Énergie Atomique-Saclay, 91191 Gif-sur-Yvette Cedex, France Department of Applied Mathematics, Sheffield University, Sheffield S3 7RH, United Kingdom Department of Applied Mathematics and Theoretical Physics, Center for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 OWA, United Kingdom
Citations
Ringeval, C., Brax, P., van de Bruck, C., & Davis, A.-C. (2006). Boundary inflation and the WMAP data. Physical Review. D, Particles, Fields, Gravitation and Cosmology, 73(6), 064035 [23 pages]. https://doi.org/10.1103/PhysRevD.73.064035 (Original work published 2006)