Precise Measurements of Primordial Power Spectrum with 21 cm Fluctuations

TL;DR

This paper explores how future 21 cm fluctuation observations combined with CMB data can precisely measure the primordial power spectrum parameters, providing insights into inflationary models.

Contribution

It presents projected constraints on primordial power spectrum parameters using future 21 cm and CMB observations, highlighting their potential for precise measurements.

Findings

Future 21 cm and CMB observations can accurately measure spectral index and its runnings.

Combined observations improve constraints on inflationary models.

Implications for understanding the early universe's inflationary period.

Abstract

We discuss the issue of how precisely we can measure the primordial power spectrum by using future observations of 21 cm fluctuations and cosmic microwave background (CMB). For this purpose, we investigate projected constraints on the quantities characterizing primordial power spectrum: the spectral index n_s, its running alpha_s and even its higher order running beta_s. We show that future 21 cm observations in combinations with CMB would accurately measure above mentioned observables of primordial power spectrum. We also discuss its implications to some explicit inflationary models.