Uncovering the history of cosmic inflation from anomalies in cosmic microwave background spectra
Instituto de Fisica Teorica, Universidad Autonoma de Madrid, 28049, Madrid, Spain
2 INAF/OAS Bologna, via Gobetti 101, 40129, Bologna, Italy
3 Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, 02138, Cambridge, MA, USA
4 The Institute of Mathematical Sciences, HBNI, CIT Campus, 600113, Chennai, India
Accepted: 22 May 2022
Published online: 30 May 2022
We propose an inflationary primordial feature model that can explain both the large and small-scale anomalies in the currently measured cosmic microwave background anisotropy spectra, revealing a clip of adventurous history of the Universe during its primordial epoch. Although the model is currently statistically indistinguishable from the Standard Model, we show that planned observations such as the Simons Observatory, LiteBIRD and CMB-S4 will complement each other in distinguishing the model differences due to their accurate E-mode polarization measurements, offering very optimistic prospects for a detection or exclusion. The model predicts a signal of classical primordial standard clock, which can also be used to distinguish the inflation and alternative scenarios in a model-independent fashion.
© The Author(s) 2022
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3