Non-Standard Primordial Clocks from Dynamical Mass in Alternative to Inflation Scenarios

Abstract

In the primordial universe, oscillations of heavy fields can be considered as standard clocks to measure the expansion or contraction history of the universe. Those standard clocks provide a model-independent way of distinguishing inflation and alternative scenarios. However, the mass of the heavy fields may not be a constant mass, but rather mass dynamically generated by non-minimal coupling to the Ricci scalar, or self-interactions. In the case of dynamically generated mass, the mass of the heavy field is generically of order Hubble, and thus is time-dependent in alternative to inflation scenarios. We show that such dynamically generated mass terms can be considered as non-standard primordial clocks for alternative to inflation, providing similar oscillatory frequencies as standard clocks of inflation. Additional information on scale dependence can distinguish such non-standard clocks from standard clocks.

21 pages, 2 figures and 44 references

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Cited by in corpus (6)

• Large-Field Inflation and the Cosmological Collider
• Missing Scalars at the Cosmological Collider
• Uncovering the History of Cosmic Inflation from Anomalies in Cosmic Microwave Background Spectra
• There and Back Again: Mapping and Factorising Cosmological Observables
• Back to the features: assessing the discriminating power of future CMB missions on inflationary models
• Fingerprints of a Non-Inflationary Universe from Massive Fields