Back to the features: assessing the discriminating power of future CMB missions on inflationary models

Abstract

Future Cosmic Microwave Background (CMB) experiments will deliver extremely accurate measurements of the E-modes pattern of the CMB polarization field. Given the sharpness of the E-modes transfer functions, such surveys make for a powerful detector of high-frequency signals from primordial features that may be lurking in current data sets. With a handful of toy models that increase the fit to the latest Planck data, but are of marginal statistical significance, we use a state-of-the-art forecast pipeline to illustrate the promising prospects to test primordial features in the next decade. Not only will future experiments allow us to detect such features in data, but they will also be able to discriminate between models and narrow down the physical mechanism originating them with high statistical significance. On the other hand, if the anomalies in the currently measured CMB spectra are just statistical fluctuations, all the current feature best fit candidates will be ruled out. Either way, our results show that primordial features are a clear target of forthcoming CMB surveys beyond the detection of tensor modes.

36 pages, 15 figures; v2 matches version published in JCAP

References in corpus (32)

• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• Primordial Non-Gaussianities from Inflation Models
• PolyChord: nested sampling for cosmology
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Improved limits on the tensor-to-scalar ratio using BICEP and Planck
• The shape of primordial non-Gaussianity and the CMB bispectrum
• Cosmology with the SPHEREX All-Sky Spectral Survey
• LiteBIRD: JAXA's new strategic L-class mission for all-sky surveys of cosmic microwave background polarization
• Probing Primordial Features with the Stochastic Gravitational Wave Background
• Models of the Primordial Standard Clock
• Inflation: Theory and Observations
• Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background
• Wiggly Whipped Inflation
• Combining power spectrum and bispectrum measurements to detect oscillatory features
• Scratches from the Past: Inflationary Archaeology through Features in the Power Spectrum of Primordial Fluctuations
• Precise measurements of inflationary features with 21 cm observations
• Numerical evaluation of the bispectrum in multiple field inflation
• New constraint on the tensor-to-scalar ratio from the $Planck$ and BICEP/Keck Array data using the profile likelihood
• Classical Cosmological Collider Physics and Primordial Features
• Searching for Standard Clocks in the Primordial Universe
• One spectrum to cure them all: Signature from early Universe solves major anomalies and tensions in cosmology
• Planck and BICEP/Keck Array 2018 constraints on primordial gravitational waves and perspectives for future B-mode polarization measurements
• Uncovering the History of Cosmic Inflation from Anomalies in Cosmic Microwave Background Spectra
• Primordial Standard Clock Models and CMB Residual Anomalies
• Comparing multi-field primordial feature models with the Planck data
• Discordances in cosmology and the violation of slow-roll inflationary dynamics
• New constraints on primordial features from the galaxy two-point correlation function
• Changes in the halo formation rates due to features in the primordial spectrum
• Effect of damped oscillations in the inflationary potential
• Nonlinear reconstruction of features in the primordial power spectrum from large-scale structure
• Primordial Clocks within Stochastic Gravitational Wave Anisotropies
• Optimising Inflationary Features the Bayesian Way

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• Questions on calculation of primordial power spectrum with large spikes: the resonance model case
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• Primordial feature constraints from BOSS+eBOSS
• Fingerprints of a Non-Inflationary Universe from Massive Fields
• Searching for local features in primordial power spectrum using genetic algorithms
• The cosmological collider in $R^2$ inflation
• Investigating the Origin of CMB Large-Scale Features Using LiteBIRD and CMB-S4
• Refining the nonlinear modelling of primordial oscillatory features
• Potential Surge Preheating: enhanced resonance from potential features
• Nonlinear Lattice Framework for Inflation: Bridging stochastic inflation and the $\delta N$ formalism