Observational imprints of enhanced scalar power on small scales in ultra slow roll inflation and associated non-Gaussianities

Abstract

The discovery of gravitational waves from merging binary black holes has generated considerable interest in examining whether these black holes could have a primordial origin. If a significant number of black holes have to be produced in the early universe, the primordial scalar power spectrum should have an enhanced amplitude on small scales, when compared to the COBE normalized values on the larger scales that is strongly constrained by the anisotropies in the cosmic microwave background. In the inflationary scenario driven by a single, canonical scalar field, such power spectra can be achieved in models that permit a brief period of ultra slow roll inflation during which the first slow roll parameter decreases exponentially. In this review, we shall consider a handful of such inflationary models as well as a reconstructed scenario and examine the extent of formation of primordial black holes and the generation of secondary gravitational waves in these cases. We shall also discuss the strength and shape of the scalar bispectrum and the associated non-Gaussianity parameter that arise in such situations. We shall conclude with an outlook wherein we discuss the wider implications of the increased strengths of the non-Gaussianities on smaller scales.

arXiv commentv1: 35 pages, 14 figures, invited review, submitted to Galaxies; v2: 36 pages, 15 figures, minor revision, references and discussions added, version to appear in Galaxies

References in corpus (119)

• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Did LIGO detect dark matter?
• New cosmological constraints on primordial black holes
• Primordial Black Holes as Dark Matter
• Gravitational Wave Experiments and Early Universe Cosmology
• Encyclopaedia Inflationaris
• Inflation Dynamics and Reheating
• Cosmological Backgrounds of Gravitational Waves
• Primordial Black Holes - Perspectives in Gravitational Wave Astronomy -
• Primordial Black Holes as Dark Matter: Recent Developments
• The NANOGrav 12.5-year Data Set: Search For An Isotropic Stochastic Gravitational-Wave Background
• Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
• Gravitational-wave sensitivity curves
• The cosmological gravitational wave background from primordial density perturbations
• Primordial Black Holes as a dark matter candidate
• Primordial Non-Gaussianities from Inflation Models
• Primordial Black Holes
• How long before the end of inflation were observable perturbations produced?
• Semianalytic Calculation of Gravitational Wave Spectrum Nonlinearly Induced from Primordial Curvature Perturbations
• Primordial black holes from single field models of inflation
• On graviton non-Gaussianities during inflation
• Gravitational Waves Induced by non-Gaussian Scalar Perturbations
• Science with the space-based interferometer LISA. IV: Probing inflation with gravitational waves
• Gravitational wave background as a probe of the primordial black hole abundance
• The NANOGrav 11-year Data Set: Pulsar-timing Constraints On The Stochastic Gravitational-wave Background
• Primordial non-gaussianities in single field inflation
• Horizon crossing and inflation with large η
• A Cosmological Signature of the SM Higgs Instability: Gravitational Waves
• Primordial black hole dark matter from single field inflation
• Inflationary perturbations from a potential with a step
• Steepest growth of the power spectrum and primordial black holes
• Computations of primordial black hole formation
• Primordial Black Holes and Slow-Roll Violation
• The Best Inflationary Models After Planck
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Primordial Black Hole production in Critical Higgs Inflation
• Primordial Black Holes as Generators of Cosmic Structures
• The abundance of primordial black holes depends on the shape of the inflationary power spectrum
• The Primordial Black Hole Dark Matter - LISA Serendipity
• A universal threshold for primordial black hole formation
• Testing Primordial Black Holes as Dark Matter through LISA
• Enhancement of superhorizon scale inflationary curvature perturbations
• Primordial Black Holes from Inflation and non-Gaussianity
• Primordial Black Holes from $\alpha$-attractors
• A new calculation of the mass fraction of primordial black holes
• Primordial Black Holes from a tiny bump/dip in the Inflaton potential
• Imprints of Primordial Non-Gaussianity on Gravitational Wave Spectrum
• Primordial Black Holes Confront LIGO/Virgo data: Current situation
• The exponential tail of inflationary fluctuations: consequences for primordial black holes
• The Ineludible non-Gaussianity of the Primordial Black Hole Abundance
• Primordial Black Holes from Polynomial Potentials in Single Field Inflation
• Gravitational-Wave Constraints on the Abundance of Primordial Black Holes
• Gravitational Waves Induced by Scalar Perturbations with a Lognormal Peak
• PBHs and secondary GWs from ultra slow roll and punctuated inflation
• Inflation and Primordial Black Holes
• Primordial Black Holes and Local Non-Gaussianity in Canonical Inflation
• Improved Estimates of Cosmological Perturbations
• Mechanisms for Primordial Black Hole Production in String Theory
• Punctuated inflation and the low CMB multipoles
• Primordial non-gaussianity up to all orders: theoretical aspects and implications for primordial black hole models
• One-loop corrections to the curvature perturbation from inflation
• Primordial black hole formation with non-Gaussian curvature perturbations
• CMB polarization features from inflation versus reionization
• Primordial Black Holes from String Inflation
• Inflationary perturbations near horizon crossing
• The primordial black hole formation criterion re-examined: parameterisation, timing, and the choice of window function
• Searching For Gravitational Waves From Cosmological Phase Transitions With The NANOGrav 12.5-year dataset
• Evidence for primordial black hole dark matter from LIGO/Virgo merger rates
• Non-linear statistics of primordial black holes from gaussian curvature perturbations
• The Observational Status of Cosmic Inflation after Planck
• Primordial Black Hole Dark Matter and the LIGO/Virgo observations
• PBH in single field inflation: the effect of shape dispersion and non-Gaussianities
• Dissecting the growth of the power spectrum for primordial black holes
• On the robustness of the primordial power spectrum in renormalized Higgs inflation
• Identifying the most crucial parameters of the initial curvature profile for primordial black hole formation
• Abundance of primordial black holes with local non-Gaussianity in peak theory
• Primordial blackholes and gravitational waves for an inflection-point model of inflation
• BINGO: A code for the efficient computation of the scalar bi-spectrum
• Inflationary Cosmological Perturbations of Quantum-Mechanical Origin
• Pulsar Timing Array Constraints on the Induced Gravitational Waves
• Primordial black holes dark matter from inflection point models of inflation and the effects of reheating
• Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• The tensor-to-scalar ratio in punctuated inflation
• An analytical approximation of the scalar spectrum in the ultra-slow-roll inflationary models
• Highly non-Gaussian tails and primordial black holes from single-field inflation
• Simulation of primordial black hole formation using pseudo-spectral methods
• An analytic approach to non-slow-roll inflation
• Non-Gaussian Formation of Primordial Black Holes: Effects on the Threshold
• A note on the role of the boundary terms for the non-Gaussianity in general k-inflation
• Constant roll and primordial black holes
• Power spectrum of primordial perturbations during ultra-slow-roll inflation with back reaction effects
• Low & High scale MSSM inflation, gravitational waves and constraints from Planck
• The scalar bi-spectrum in the Starobinsky model: The equilateral case
• Overshooting, Critical Higgs Inflation and Second Order Gravitational Wave Signatures
• Cosmological Inflation: Theory and Observations
• Accounting for scalar non-Gaussianity in secondary gravitational waves
• Primordial power spectra for curved inflating universes
• Induced gravitational waves from the cosmic coincidence
• Primordial black hole dark matter from inflation: the reverse engineering approach
• Accuracy of slow-roll formulae for inflationary perturbations: implications for primordial black hole formation
• On the evolution of tachyonic perturbations at super-Hubble scales
• Exploring the Spectral Shape of Gravitational Waves Induced by Primordial Scalar Perturbations and Connection with the Primordial Black Hole Scenarios
• One spectrum to cure them all: Signature from early Universe solves major anomalies and tensions in cosmology
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part II: the Trispectrum
• Consistency conditions and primordial black holes in single field inflation
• Solving peak theory in the presence of local non-gaussianities
• An efficient method for solving highly oscillatory ordinary differential equations with applications to physical systems
• Non-Gaussian corrections to the probability distribution of the curvature perturbation from inflation
• Superhorizon curvature perturbation in ultra-slow-roll inflation
• Could PBHs and secondary GWs have originated from squeezed initial states?
• Efficient diagrammatic computation method for higher order correlation functions of local type primordial curvature perturbations
• Observing nulling of primordial correlations via the 21 cm signal
• Why Must Primordial Non-Gaussianity Be Very Small?
• Numerical evaluation of the three-point scalar-tensor cross-correlations and the tensor bi-spectrum
• CMB $\mu T$ cross-correlations as a probe of PBH scenarios
• Non-Gaussianity effects on the primordial black hole abundance for sharply-peaked primordial spectrum
• Perturbative region on non-Gaussian parameter space in single-field inflation
• Power spectrum nulls due to non-standard inflationary evolution

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• One loop to rule them all: Perturbativity in the presence of ultra slow-roll dynamics
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• Constraints on primordial black holes from LIGO-Virgo-KAGRA O3 events
• Realisation of the ultra-slow roll phase in Galileon inflation and PBH overproduction
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• Constraining the history of reheating with the NANOGrav 15-year data
• Constraining ultra slow roll inflation using cosmological datasets
• Primordial Black Holes Dark Matter and Secondary Gravitational Waves from Warm Higgs-G Inflation
• Conserved cosmological perturbations in USR inflation and bouncing scenarios
• Non-Minimal Inflation with a scalar-curvature mixing term $\frac{1}{2}\xi R{\varphi }^2$
• Primordial black holes in SB SUSY Gauss-Bonnet inflation
• Non-Gaussianities and Primordial Black Holes
• An analytical approximation of the evolution of the primordial curvature perturbation in the ultraslow-roll inflation
• Primordial black holes from the ultraslow-roll phase in the inflaton--curvaton mixed field inflation
• Inflationary relics from an Ultra-Slow-Roll plateau
• Amplifying quantum discord during inflationary magnetogenesis through violation of parity
• Cosmological consequences of statistical inhomogeneity
• Chiral gravitational waves from multi-phase magnetogenesis
• Mimicking two field inflationary features with a single field
• Primordial black holes and scalar induced gravitational waves from sound speed resonance in non-minimal derivative coupling inflation model