A Remark on "A CMB/Dark Energy Cosmic Duality"

TL;DR

This paper critiques a recent calculation of low multipole suppression in the CMB spectrum, emphasizing the importance of the ISW effect over the SW term in models with an IR cut-off related to the Hubble radius.

Contribution

It highlights the significance of the ISW contribution in low multipole CMB suppression models, which was overlooked in previous calculations.

Findings

ISW term dominates over SW term at low multipoles

IR cut-off near the Hubble radius enhances ISW effects

Previous models underestimated the ISW contribution

Abstract

The recent calculation on the suppression of the power at low multipoles in the CMB spectrum due to an IR cut-off presented in hep-th/0406019 does not take into account the Integrated Sachs-Wolfe (ISW) term, which is crucial in models aiming to the explanation of the present acceleration of the Universe. We show that the ISW contribution to low multipoles is tipically much greater than the SW term, for an IR cut-off comparable to the present Hubble radius.