Cosmic microwave background anisotropies seeded by incoherent sources

TL;DR

This paper demonstrates a semi-analytical method to understand the generic features of cosmic microwave background anisotropies caused by incoherent active seeds, highlighting the absence of small-scale acoustic peaks.

Contribution

It introduces a semi-analytical approach to analyze CMB anisotropies from incoherent active seeds, bypassing detailed model-specific calculations.

Findings

Reveals the absence of small-scale acoustic peaks in anisotropies from incoherent seeds.

Provides a generic, semi-analytical framework for understanding active seed-induced anisotropies.

Shows that key features can be derived without detailed modeling of seed formation and evolution.

Abstract

The cosmic microwave background anisotropies produced by active seeds, such as topological defects, have been computed recently for a variety of models by a number of authors. In this paper we show how the generic features of the anisotropies caused by active, incoherent, seeds (that is the absence of acoustic peaks at small scales) can be obtained semi-analytically, without entering into the model dependent details of their formation, structure and evolution.