Boundary inflation and the WMAP data

Journal Article · Wed Mar 15 04:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.73.064035· OSTI ID:20782669

Ringeval, Christophe; Brax, Philippe; Bruck, Carsten van de; Davis, Anne-Christine

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-{gamma}<2x10{sup -3}, at 95% confidence level. This suggests that future CMB data could provide crucial information helping to distinguish scalar-tensor and standard inflationary scenarios.

• OSTI ID: 20782669
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 73; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
APPROXIMATIONS
COSMIC RADIATION
COSMOLOGY
COUPLING CONSTANTS
DISTURBANCES
ENTROPY
GRAVITATION
MARKOV PROCESS
MATHEMATICAL SOLUTIONS
MONTE CARLO METHOD
PROBABILITY
RADIOWAVE RADIATION
RELICT RADIATION
SCALAR FIELDS
SCALARS
TENSORS