The Accelerated Recombination, and the ACBAR and WMAP data

TL;DR

This paper analyzes deviations from standard recombination using ACBAR and WMAP data, finding that accelerated and delayed recombination are equally plausible with some parameter degeneracies.

Contribution

It investigates the likelihood of accelerated versus delayed recombination using recent CMB data, highlighting degeneracies with key cosmological parameters.

Findings

Accelerated recombination is as likely as delayed recombination.

Degeneracy exists between $oldsymbol{\epsilon_{oldsymbol{\alpha}}}$ and $oldsymbol{ _s, \log[10^{10}A_s], ext{ extbf{H}}_0}$.

Data shows no strong preference for either recombination scenario.

Abstract

We have investigated the deviation from the standard recombination process, using the ACBAR 2008 and the WMAP 3 year data. In this investigation, we have considered the possibility of the accelerated recombination as well as the delayed recombination. We find that the accelerated recombination is as likely as the delayed recombination, and there is some degeneracy between $\epsilon_{\alpha}$ and \{$n_s$, $\log[10^{10}A_s]$, $H_0$\}.