Causality and the power spectrum - INSPIRE

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Causality and the power spectrum

Jul, 1995

12 pages

Published in:

Phys.Rev.D 53 (1996) 618-621

e-Print:

astro-ph/9507043 [astro-ph]

DOI:

10.1103/PhysRevD.53.618

Report number:

IMPERIAL-TP-94-95-40

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Abstract: (arXiv)

We find constraints on the generation of super-causal-horizon energy perturbations from a smooth initial state, under a simple physical scheme. We quantify these constraints by placing the upper limit

\lambda_c = 3.0 d_H

on the wavelength at which the power spectrum turns over to

k~4

behavior. This means that sub-horizon processes can generate significant power on scales further outside the horizon than one might naively expect. The existence of this limit may have important implications for the interpretation of the small scale power spectrum of the Cosmic Microwave Background.

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