Dark energy imprints on the kinematic Sunyaev-Zel'dovich signal

TL;DR

This paper explores how dark energy influences the kinetic Sunyaev-Zel'dovich (kSZ) effect's angular power spectrum, highlighting its potential to constrain dark energy properties through precise modeling and observations.

Contribution

It provides a detailed analysis of dark energy's impact on the kSZ spectrum and develops a fitting formula to aid future observational constraints.

Findings

kSZ signal varies by over 10% with 20% change in w

30% change in w_a causes significant kSZ spectrum variation

Modeling the post-reionization signal improves reionization duration constraints

Abstract

We investigate the imprint of dark energy on the kinetic Sunyaev-Zel'dovich (kSZ) angular power spectrum on scales of $\ell=1000$ to $10000$, and find that the kSZ signal is sensitive to the dark energy parameter. For example, varying the constant $w$ by 20\% around $w=-1$ results in a $\gtrsim10\%$ change on the kSZ spectrum; changing the dark energy dynamics parametrized by $w_a$ by $\pm0.5$, a 30\% change on the kSZ spectrum is expected. We discuss the observational aspects and develop a fitting formula for the kSZ power spectrum. Finally, we discuss how the precise modeling of the post-reionization signal would help the constraints on patchy reionization signal, which is crucial for measuring the duration of reionization.