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Primordial Features from Linear to Nonlinear Scales

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arxiv 1906.08758 v2 pith:HW4IRAW5 submitted 2019-06-20 astro-ph.CO hep-phhep-th

Florian Beutler , Matteo Biagetti , Daniel Green , Anže Slosar , Benjamin Wallisch This is my paper · ORCID
classification astro-ph.COhep-phhep-th
keywords featurespowerprimordialrangebaryongalaxylarge-scalelinear
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Sharp features in the primordial power spectrum are a powerful window into the inflationary epoch. To date, the cosmic microwave background (CMB) has offered the most sensitive avenue to search for these signatures. In this paper, we demonstrate the power of large-scale structure observations to surpass the CMB as a probe of primordial features. We show that the signatures in galaxy surveys can be separated from the broadband power spectrum and are as robust to the nonlinear evolution of matter as the standard baryon acoustic oscillations. As a result, analyses can exploit a significant range of scales beyond the linear regime available in the datasets. We develop a feature search for large-scale structure, apply it to the final data release of the Baryon Oscillation Spectroscopic Survey and find new bounds on oscillatory features that exceed the sensitivity of Planck for a significant range of frequencies. Moreover, we forecast that the next generation of galaxy surveys, such as DESI and Euclid, will be able to improve current constraints by up to an order of magnitude over an expanded frequency range.

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Cited by 5 Pith papers

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    Excursion-set halo and void abundances are derived for exponential-tailed non-Gaussian fluctuations, giving new first-passage-time formulas and a void-size-function series.

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

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    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.

  4. 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.

  5. Beyond {\Lambda}CDM with the SKA Observatory -- II: Unveiling the Secrets of the Early Universe

    astro-ph.CO 2026-07 accept novelty 3.5 of 10

    Updated SKAO-AA4 forecasts show multi-tracer HI+galaxy analyses can reach σ(f_local_NL)≲1 and improve αs bounds by tens of percent when combined with future CMB, while foregrounds and GR light-cone effects remain the ...

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