Constraints on inflation with LSS surveys: features in the primordial power spectrum

Abstract

We analyse the efficiency of future large scale structure surveys to unveil the presence of scale dependent features in the primordial spectrum --resulting from cosmic inflation-- imprinted in the distribution of galaxies. Features may appear as a consequence of non-trivial dynamics during cosmic inflation, in which one or more background quantities experienced small but rapid deviations from their characteristic slow-roll evolution. We consider two families of features: localized features and oscillatory extended features. To characterise them we employ various possible templates parametrising their scale dependence and provide forecasts on the constraints on these parametrisations for LSST like surveys. We perform a Fisher matrix analysis for three observables: cosmic microwave background (CMB), galaxy clustering and weak lensing. We find that the combined data set of these observables will be able to limit the presence of features down to levels that are more restrictive than current constraints coming from CMB observations only. In particular, we address the possibility of gaining information on currently known deviations from scale invariance inferred from CMB data, such as the feature appearing at the $\ell \sim 20$ multipole (which is the main contribution to the low-$\ell$ deficit) and a potential feature appearing at $\ell \sim 800$.

37 pp., 5 Tabs., 10 Figs, v3: changed discussion around templates II, III, added clarifications, comments and references. Matches JCAP version

References in corpus (20)

• The Effective Field Theory of Inflation
• Measuring the dark side (with weak lensing)
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Mass hierarchies and non-decoupling in multi-scalar field dynamics
• Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• Effects of particle production during inflation
• Energy Transfer in Multi Field Inflation and Cosmological Perturbations
• Primordial power spectrum from Planck
• On Features and Nongaussianity from Inflationary Particle Production
• Models of the Primordial Standard Clock
• Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background
• Wiggly Whipped Inflation
• Whipped inflation
• Combining power spectrum and bispectrum measurements to detect oscillatory features
• Precise measurements of inflationary features with 21 cm observations
• Untangling features in the primordial spectra
• Probing primordial features with next-generation photometric and radio surveys
• Late time sky as a probe of steps and oscillations in primordial Universe
• Combined features in the primordial spectra induced by a sudden turn in two-field DBI inflation

Cited by in corpus (26)

• Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation
• Primordial Features from Linear to Nonlinear Scales
• Time-sliced perturbation theory with primordial non-Gaussianity and effects of large bulk flows on inflationary oscillating features
• Uncovering the History of Cosmic Inflation from Anomalies in Cosmic Microwave Background Spectra
• Cosmological constraints on the gravitational constant
• Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys
• Primordial Standard Clock Models and CMB Residual Anomalies
• Comparing multi-field primordial feature models with the Planck data
• Towards testing CMB anomalies using the kinetic and polarized Sunyaev Zel'dovich effects
• Euclid: The search for primordial features
• Searching for Oscillations in the Primordial Power Spectrum with CMB and LSS Data
• Lensing anomaly and oscillations in the primordial power spectrum
• Back to the features: assessing the discriminating power of future CMB missions on inflationary models
• Induced Gravitational Waves from Multi-Sound Speed Resonances during Cosmological Inflation
• Primordial feature constraints from BOSS+eBOSS
• Probing primordial features with the primary CMB
• Nonlinear reconstruction of features in the primordial power spectrum from large-scale structure
• Reconstructing the EFT of Inflation from Cosmological Data
• Searching for local features in primordial power spectrum using genetic algorithms
• Understanding large scale CMB anomalies with the generalized non-minimal derivative coupling during inflation
• Refining the nonlinear modelling of primordial oscillatory features
• Investigating the Origin of CMB Large-Scale Features Using LiteBIRD and CMB-S4
• Spectral Distortion Signatures of Step-like Inflationary Potential
• Potential Surge Preheating: enhanced resonance from potential features
• Investigating the Constraints on Primordial Features with Future Cosmic Microwave Background and Galaxy Surveys
• Particle production during inflation: A Bayesian analysis with CMB data from Planck 2018