Inflationary potential as seen from different angles: model compatibility from multiple CMB missions
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Publication:6054179
DOI10.1088/1475-7516/2023/09/019arXiv2305.15378MaRDI QIDQ6054179
Author name not available (Why is that?)
Publication date: 24 October 2023
Published in: (Search for Journal in Brave)
Abstract: The cosmic microwave background (CMB) temperature and polarization anisotropies, as observed by independent astronomical missions such as WMAP, Planck, and most recently the Atacama Cosmology Telescope (ACT), have played a vital role in accurately constraining cosmological theories and models, establishing cosmic inflation as the most widely accepted theory for describing the physics of the early Universe. However, the absence of a definitive detection of B-mode polarization and the emerging discrepancies among different CMB experiments present a challenge in determining precise predictions for the inflationary models that best explain the observed data. In this work, we further explore this difficulty and conduct a case study by analyzing four well-known inflationary potentials in light of the most recent CMB observations released by Planck and ACT, along with B-modes polarization data from the BICEP Collaboration, and measurements of Baryon Acoustic Oscillations (BAO) and Redshift Space Distortions (RSD) from BOSS DR12 and eBOSS DR16. We show that the most typical models such as Starobisnky and -attractors are in disagreement with the ACT small-scale CMB measurements, particularly when combined with B-modes polarization data. On the other hand, these potentials are in perfect agreement with the Planck measurements at larger angular scales. This dichotomy makes it challenging to identify a single model or a group of models that can be universally considered as the preferred choice based on all available CMB observations.
Full work available at URL: https://arxiv.org/abs/2305.15378
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