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CBR Anisotropy and the Running of the Scalar Spectral Index

Arthur Kosowsky·Michael S. Turner
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Abstract

Accurate ($\lesssim 1\% $) predictions for the anisotropy of the Cosmic Background Radiation (CBR) are essential for using future high-resolution ($\lesssim 1^\circ$) CBR maps to test cosmological models. In many inflationary models the variation (``running'') of the spectral index of the spectrum of density perturbations is a significant effect and leads to changes of around 1\% to 10\% in the CBR power spectrum. We propose a general method for taking running into account which uses the derivative of the spectral index ($dn/d\ln k$). Conversely, high-resolution CBR maps may be able to determine $dn/d\ln k$, giving important information about the inflationary potential.

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Arthur Kosowsky, Michael S. Turner. 1995-05-23. CBR Anisotropy and the Running of the Scalar Spectral Index. https://doi.org/10.1103/physrevd.52.r1739

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