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Unique Fingerprints of Alternatives to Inflation in the Primordial Power Spectrum

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arxiv 1809.02603 v3 pith:WJYDHJT4 submitted 2018-09-07 astro-ph.CO gr-qchep-phhep-th

Xingang Chen , Abraham Loeb , Zhong-Zhi Xianyu This is my paper
classification astro-ph.COgr-qchep-phhep-th
keywords primordialsignalsfunctionuniverseclockclocksfieldsinflation
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Massive fields in the primordial universe function as standard clocks and imprint clock signals in the density perturbations that directly record the scale factor of the primordial universe as a function of time, a(t). A measurement of such signals would identify the specific scenario of the primordial universe in a model-independent fashion. In this Letter, we introduce a new mechanism through which quantum fluctuations of massive fields function as standard clocks. The clock signals appear as scale-dependent oscillatory signals in the power spectrum of alternative scenarios to inflation.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Inverse-k Primordial Oscillations from a Symbolic Regression Search

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    Symbolic regression on Planck and Planck+ACT+SPT independently selects an inverse-k primordial oscillation cos(B/k)≈cos(4/k) that weakly outperforms linear and log templates.

  2. Tightening constraints on primordial oscillations with latest ACT and SPT data

    astro-ph.CO 2025-07 conditional novelty 5.0 of 10

    Combining ACT DR6, SPT-3G D1, and Planck CMB data tightens the 95% upper limits on primordial oscillation amplitudes to about 0.029, with no significant signal.

  3. Scalar induced gravitational waves review

    gr-qc 2021-09 unverdicted novelty 2.0 of 10

    A review that unifies analytical expressions for scalar-induced gravitational waves and emphasizes calculations for non-radiation-dominated cosmologies.

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