Late time sky as a probe of steps and oscillations in primordial Universe

Abstract

The standard model of cosmology with nearly Gaussian, isotropic, scale invariant and adiabatic initial conditions describes the cosmological observations well. However, the study of any deviation from the mentioned conditions will open up a new horizon to the physics of early universe. In this work, we study the effect of the oscillatory and step-like features in potentials of inflationary models in late time large scale structure observations. Mainly we study the matter power spectrum, number density of the structures, dark matter halo bias and specifically CMB lensing. We show that the oscillatory models can introduce some degeneracy with late time effects on BAO scale. We also conclude that high frequency oscillatory models which are favored by Planck data do not have significant effect on the non linear structure formation. Finally we show that inflationary models with step functions which deviates from the standard model in small scales $l\le 1Mpc$ can be constrained by future experiments via CMB lensing. We propose the idea that CMB lensing is a bias independent observation which can be used as a small scale physics probe due to distribution of the lenses in low redshifts. Meantime this model can alter the prediction of the cosmological model for the number density of small structures and can be used as a probable explanation for galactic scale crisis of $\Lambda$CDM.

arXiv comment23 pages, 24 figures, final version

References in corpus (58)

• Planck 2015 results. XIII. Cosmological parameters
• Planck 2013 results. XVI. Cosmological parameters
• Cosmological parameters from SDSS and WMAP
• Large scale bias and the peak background split
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Baryonic Features in the Matter Transfer Function
• Halo Models of Large Scale Structure
• Revising the Halofit Model for the Nonlinear Matter Power Spectrum
• Weak Gravitational Lensing of the CMB
• An excursion set model of hierarchical clustering: Ellipsoidal collapse and the moving barrier
• Monodromy in the CMB: Gravity Waves and String Inflation
• Gravity Waves and Linear Inflation from Axion Monodromy
• The Trans-Planckian Problem of Inflationary Cosmology
• Mass Reconstruction with CMB Polarization
• A note on inflation and transplanckian physics
• Features of heavy physics in the CMB power spectrum
• Inflationary perturbations from a potential with a step
• Cosmic Complementarity: Joint Parameter Estimation from CMB Experiments and Redshift Surveys
• Planck 2015 results. XV. Gravitational lensing
• Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
• The Excursion Set Theory of Halo Mass Functions, Halo Clustering, and Halo Growth
• The dearth of halo dwarf galaxies: is there power on short scales?
• PRISM (Polarized Radiation Imaging and Spectroscopy Mission): An Extended White Paper
• Mapping the Dark Matter through the CMB Damping Tail
• The Atacama Cosmology Telescope: Two-Season ACTPol Lensing Power Spectrum
• Reconstructing baryon oscillations
• Cosmological Perturbations from a New-Physics Hypersurface
• Searching for Oscillations in the Primordial Power Spectrum: Constraints from Planck (Paper II)
• Models of the Primordial Standard Clock
• Probing primordial features with future galaxy surveys
• CMB lensing and primordial non-Gaussianity
• The Future of Primordial Features with Large-Scale Structure Surveys
• Primordial non-Gaussianity in the large scale structure of the Universe
• Inflationary Steps in the Planck Data
• Asymmetric Sky from the Long Mode Modulations
• Shedding light on the small-scale crisis with CMB spectral distortions
• Hemispherical Asymmetry and Local non-Gaussianity: a Consistency Condition
• Non-Gaussianity from Large-Scale Structure Surveys
• Untangling features in the primordial spectra
• The effect of varying sound velocity on primordial curvature perturbations
• CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
• Searching for primordial localized features with CMB and LSS spectra
• The importance of stepping up in the excursion set approach
• Consistency relations for sharp features in the primordial spectra
• Large Scale Anisotropic Bias from Primordial non-Gaussianity
• A Consistency Relation for Single-Field Inflation with Power Spectrum Oscillations
• Expected dipole asymmetry in CMB polarization
• Changes in the halo formation rates due to features in the primordial spectrum
• Primordial Spikes from Wrapped Brane Inflation
• On the Markovian assumption in the excursion set approach: the approximation of Markov Velocities
• Lensing as a Probe of Early Universe: from CMB to Galaxies
• Structure formation in $f(R)$ gravity: A distinguishing probe between the dark energy and modified gravity
• ISW-Galaxy Cross Correlation:A probe of Dark Energy clustering and distribution of Dark Matter tracers
• Matrix Formalism of Excursion Set Theory: A new approach to statistics of dark matter halo counting
• Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
• Simultaneous effect of Modified Gravity and Primordial Non-Gaussianity in Large Scale Structure Observations
• Unraveling the nature of Gravity through our clumpy Universe
• CMB lensing forecasts for constraining the primordial perturbations: adding to the CMB temperature and polarization information

Cited by in corpus (16)

• Primordial Features from Linear to Nonlinear Scales
• Features of the inflaton potential and the power spectrum of cosmological perturbations
• Spectrum oscillations from features in the potential of single-field inflation
• Constraints on inflation with LSS surveys: features in the primordial power spectrum
• Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys
• Probing primordial features with next-generation photometric and radio surveys
• Probing features in the primordial perturbation spectrum with large-scale structure data
• Euclid: The search for primordial features
• Probing primordial features with the primary CMB
• CMB lensing in a modified $\Lambda$CDM model in light of the $H_0$ tension
• Modified initial power spectrum and too big to fail problem
• Refining the nonlinear modelling of primordial oscillatory features
• Structure of cosmic web in non-linear regime: the nearest neighbour and spherical contact distributions
• Addressing the too-big-to-fail problem and the void phenomenon through a modified initial power spectrum
• Addressing Dipole Tension via Clustering in $\Lambda$CDM and beyond
• Cosmic velocity, density and halo mass function: Insights from deep learning