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We propose an inflationary primordial feature model that can explain both thelarge and small-scale anomalies in the currently measured cosmic microwavebackground (CMB) anisotropy spectra, revealing a clip of adventurous history ofthe Universe during its primordial epoch. Although the model is currentlystatistically indistinguishable from the Standard Model, we show that futureobservations such as the Simons Observatory and LiteBIRD will complement eachother in distinguishing the model differences due to their accurate E-modepolarization measurements, and the PICO mission, if funded, can put stringentconstraints on all characteristic properties. The model predicts a signal ofclassical primordial standard clock, which can also be used to distinguish theinflation and alternative scenarios in a model-independent fashion.

Uncovering the History of Cosmic Inflation from Anomalies in Cosmic Microwave Background Spectra