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WMAP BOUNDS ON BRANEWORLD TACHYONIC INFLATION

Departamento de Física and Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

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N. M. C. SANTOS

Departamento de Física and Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

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A. A. SEN

Departamento de Física and Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

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https://doi.org/10.1142/S0218271804005195Cited by:3 (Source: Crossref)

Abstract

We analyze the implications of the Wilkinson Microwave Anisotropy Probe (WMAP) results for a braneworld tachyonic model of inflation. We find that WMAP bounds on n_s allow us to constrain significantly the parameter space of the model; in particular, extremely weak string coupling is required, g_s~10^-15. Moreover, our analysis shows that the running of the scalar spectral index is within the bounds determined by WMAP for the allowed range of model parameters; however, it is not possible to obtain n_s>1 on large scales and n_s<1 on small scales.

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