Searching for Oscillations in the Primordial Power Spectrum with CMB and LSS Data

Abstract

Different inflationary models predict oscillatory features in the primordial power spectrum. These can leave an imprint on both the cosmic microwave background (CMB) and the large-scale structure (LSS) of our Universe, that can be searched for with current data. Inspired by the axion-monodromy model of inflation, we search for primordial oscillations that are logarithmic in wavenumber, using both CMB data from the Planck satellite and LSS data from the WiggleZ galaxy survey. We find that, within our search range for the new oscillation parameters (amplitude, frequency and phase), both CMB-only and CMB+LSS data yield the same best-fit oscillation frequency of ${\log }_{10}\omega =1.5$, improving the fit over $\Lambda$CDM by $\Delta {\chi }^2=-9$ and $\Delta {\chi }^2=-13$ (roughly corresponding to $2\sigma$ and $2.8\sigma$ significance), respectively. Bayesian evidence for the log-oscillation model versus $\Lambda$CDM indicates a very slight preference for the latter. Future CMB and LSS data will further probe this scenario.

arXiv comment6 pages, 5 figures; important reference added; new author added; figure updated

References in corpus (33)

• Planck 2015 results. XIII. Cosmological parameters
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Multimodal nested sampling: an efficient and robust alternative to MCMC methods for astronomical data analysis
• The Simons Observatory: Science goals and forecasts
• Planck 2013 results. XXII. Constraints on inflation
• LSST Science Book, Version 2.0
• Monodromy in the CMB: Gravity Waves and String Inflation
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• Gravity Waves and Linear Inflation from Axion Monodromy
• The Trans-Planckian Problem of Inflationary Cosmology
• Planck 2015 results. XI. CMB power spectra, likelihoods, and robustness of parameters
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• Oscillations in the CMB from Axion Monodromy Inflation
• A note on inflation and transplanckian physics
• CMB-S4 Science Book, First Edition
• The WiggleZ Dark Energy Survey: Final data release and cosmological results
• A generic estimate of trans-Planckian modifications to the primordial power spectrum in inflation
• Cosmological Perturbations from a New-Physics Hypersurface
• Searching for Oscillations in the Primordial Power Spectrum: Constraints from Planck (Paper II)
• (Small) Resonant non-Gaussianities: Signatures of a Discrete Shift Symmetry in the Effective Field Theory of Inflation
• Oscillations in the inflaton potential?
• Probing primordial features with future galaxy surveys
• The Future of Primordial Features with Large-Scale Structure Surveys
• Oscillations in the inflaton potential: Complete numerical treatment and comparison with the recent and forthcoming CMB datasets
• Combining power spectrum and bispectrum measurements to detect oscillatory features
• Searching for Oscillations in the Primordial Power Spectrum: Perturbative Approach (Paper I)
• Unwinding Inflation
• Constraining inflation with future galaxy redshift surveys
• Natural Inflation, Planck Scale Physics and Oscillating Primordial Spectrum
• Probing primordial features with next-generation photometric and radio surveys
• Constraints on inflation with LSS surveys: features in the primordial power spectrum
• An optimal estimator for resonance bispectra in the CMB
• Changes in the halo formation rates due to features in the primordial spectrum

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• Planck residuals anomaly as a fingerprint of alternative scenarios to inflation
• Euclid: The search for primordial features
• Lensing anomaly and oscillations in the primordial power spectrum
• New constraints on primordial features from the galaxy two-point correlation function
• Nonlinear reconstruction of features in the primordial power spectrum from large-scale structure
• Band-limited Features in the Primordial Power Spectrum Do Not Resolve the Hubble Tension
• On the primordial origin of the smoothing excess in the $Planck$ temperature power spectrum in light of LSS data
• Searching for local features in primordial power spectrum using genetic algorithms
• Resonant Reconciliation of Convex Models and the Planck
• Thermal Loop Effects on Large-Scale Curvature Perturbation in the Higgs Inflation
• Exploring Early and Late Cosmology with Next Generation Surveys
• Observable Quantum Loop Effects in the Sky
• Knot reconstruction of the scalar primordial power spectrum with Planck, ACT, and SPT CMB data
• Refining the nonlinear modelling of primordial oscillatory features
• Planckian hypersurfaces, inflation and bounces
• Exploring the CMB Power Suppression in Canonical Inflation Models