Inverse-k Primordial Oscillations from a Symbolic Regression Search

arXiv:2607.04925 · astro-ph.CO, gr-qc, hep-th · Submitted 2026-07-06 · Read on arXiv

Ze-Yu Peng, Qing-Yu Lan, Yun-Song Piao

astro-ph.CO, gr-qc, hep-th

Submitted: 2026-07-06

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Symbolic Regression — 11× in this paper · explained in 5 episodes
• ACT Data — 1× in this paper · explained in 1 episode
• Adam — 1× in this paper · explained in 2 episodes
• Loss Function — 1× in this paper · explained in 2 episodes
• Objective Function — 1× in this paper · explained in 2 episodes

Sources

• Planck 2018 results. VI. Cosmological parameters
• Inflationary perturbations from a potential with a step
• Natural Inflation, Planck Scale Physics and Oscillating Primordial Spectrum
• Breaking scale invariance from a singular inflaton potential
• Scratches from the Past: Inflationary Archaeology through Features in the Power Spectrum of Primordial Fluctuations
• Inflation: Theory and Observations
• Searching for Standard Clocks in the Primordial Universe
• Unique Fingerprints of Alternatives to Inflation in the Primordial Power Spectrum
• Observing Trans-Planckian Signatures in the Cosmic Microwave Background
• Searching for Oscillations in the Primordial Power Spectrum: Perturbative Approach (Paper I)
• Searching for Oscillations in the Primordial Power Spectrum: Constraints from Planck (Paper II)
• Constraining Monodromy Inflation
• Planck Constraints on Monodromy Inflation
• Oscillations in the inflaton potential: Complete numerical treatment and comparison with the recent and forthcoming CMB datasets
• Planck 2018 results. X. Constraints on inflation
• Primordial Features from Linear to Nonlinear Scales
• New constraints on primordial features from the galaxy two-point correlation function
• Primordial feature constraints from BOSS+eBOSS
• The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $\Lambda$CDM Parameters
• The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models

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