Complementary probes of inflationary cosmology

TL;DR

This paper combines multiple cosmological probes, including CMB data, primordial black hole limits, and spectral distortions, to tighten constraints on inflationary models across a broad range of energy scales.

Contribution

It introduces an integrated analysis of diverse observational data to improve constraints on inflationary parameters, especially the scalar spectral index runnings.

Findings

Stricter bounds on the runnings of the scalar spectral index.

Enhanced constraints achieved by combining large-scale and small-scale observations.

Demonstrates the effectiveness of joint cosmological surveys in inflation research.

Abstract

A rigorous constraint analysis on cosmic inflation entails several probes which collectively survey an extensive range of energy scales. We complement the cosmic microwave background data with an updated compilation of the cosmic abundance limits of primordial black holes, with which we infer stringent constraints on the runnings of the scalar spectral index. These constraints are notably improved by further including imminent measurements of the cosmic microwave background spectral distortions, clearly illustrating the effectiveness of joint large-scale and small-scale cosmological surveys.