Brane-world inflation: slow-roll corrections to the spectral index

Details Brane-world inflation: slow-roll corrections to the spectral index Brane-world inflation: slow-roll corrections to the spectral index

2007-09-03

arxiv.org/abs/0709.0294v1

Phys.Rev.D77:021501,2008

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure

Scientific paper

10.1103/PhysRevD.77.021501

We quantify the slow-roll corrections to primordial density perturbations arising from inflation driven by a four-dimensional scalar field with a monomial potential in a five-dimensional non-compact bulk spacetime. Although the difference between the classical brane-world solutions and standard four-dimensional solutions is large at early times, the change to the amplitude at late times of perturbations generated from quantum fluctuations is first-order in slow-roll parameters, leading to second-order slow-roll corrections to the spectral index. This confirms that the leading-order effects are correctly given by previous work in the literature.

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