Constraints on brane-world inflation from the CMB power spectrum: revisited
Abstract
We analyze the Randal Sundrum brane-world inflation scenario in the context of the latest CMB constraints from Planck. We summarize constraints on the most popular classes of models and explore some more realistic inflaton effective potentials. The constraint on standard inflationary parameters changes in the brane-world scenario. We confirm that in general the brane-world scenario increases the tensor-to-scalar ratio, thus making this paradigm less consistent with the Planck constraints. Indeed, when BICEP2/Keck constraints are included, all monomial potentials in the brane-world scenario become disfavored compared to the standard scenario. However, for natural inflation the brane-world scenario could fit the constraints better due to larger allowed values of e-foldings N before the end of inflation in the brane-world.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- March 2018
- DOI:
- 10.1088/1475-7516/2018/03/028
- arXiv:
- arXiv:1611.05123
- Bibcode:
- 2018JCAP...03..028G
- Keywords:
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- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 23 Pages, 21 Figures,1 Table, Published in JCAP, matches published version