Turning in the landscape: a new mechanism for generating Primordial Black Holes

Fumagalli, Jacopo; Renaux‐Petel, Sébastien; Ronayne, J. W.; Witkowski, Lukas T.

doi:10.48550/arxiv.2004.08369

Cited by 80 publications

(178 citation statements)

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“…Finally, extending the ideas we presented in this work to the multiple field case appear as another interesting venue to be explored, in particular to make a comparison with single-field results. Then a pronounced dip feature in the power spectrum might be missing [61][62][63] (but see [64]). Similarly, in models that utilize axion gauge-field dynamics during inflation to enhance the curvature perturbation, such a future is not present (See e.g.…”

Section: Discussionmentioning

confidence: 99%

CMB $μT$ cross-correlations as a probe of PBH scenarios

Özsoy,

Tasinato

2021

Preprint

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We propose a new method for probing inflationary models of primordial black hole (PBH) production, using only CMB physics at relatively large scales. In these scenarios, the primordial power spectrum profile for curvature perturbations is characterized by a pronounced dip, followed by a rapid growth towards small scales, leading to a peak responsible for PBH formation. We focus on scales around the dip that are well separated from the peak to analytically compute expressions for the curvature power spectrum and bispectrum. The size of the squeezed bispectrum is enhanced at the position of the dip, and it acquires a characteristic scale dependence that can be probed by cross-correlating CMB µ-distortions and temperature fluctuations. We quantitatively study the properties of such cross-correlations and how they depend on the underlying model, discussing how they can be tested by the next generation of CMB µ-distortion experiments. This method allows one to experimentally probe inflationary PBH scenarios using well-understood CMB physics, without considering non-linearities associated with PBH formation and evolution.

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Section: Discussionmentioning

confidence: 99%

CMB $μT$ cross-correlations as a probe of PBH scenarios

Özsoy,

Tasinato

2021

Preprint

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“…It would be interesting to include such corrections to to investigate the impact of not so squeezed and collapsed limit n-point correlators of curvature perturbation on the µT and µµ angular correlators. Finally, it would be interesting to extend our analysis to derive predictions on the µ distortion anisotropies for scenarios including multiple scalar fields [87][88][89]. Such an analysis would be helpful in comparing the general single field predictions we derived in this work and guide us towards a better understanding for the formation mechanism of BHs with astrophysically relevent masses.…”

Section: Discussionmentioning

confidence: 90%

Consistency conditions and primordial black holes in single field inflation

Özsoy,

Tasinato

2021

Preprint

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We discuss new consistency relations for single field models of inflation capable of generating primordial black holes (PBH), and their observational implications for CMB µ-space distortions. These inflationary models include a short period of non-attractor evolution: the scale-dependent profile of curvature perturbation is characterised by a pronounced dip, followed by a rapid growth leading to a peak responsible for PBH formation. We investigate the squeezed and the collapsed limits of three and four point functions of curvature perturbation around the dip, showing that they satisfy consistency relations connecting their values to the total amplification of the curvature spectrum, and to the duration of the non-attractor era.Moreover, the corresponding non-Gaussian parameters are scale-dependent in proximity of the dip, with features that again depend on the amplification of the spectrum. For typical PBH scenarios requiring an order O(10 7 ) enhancement of the spectrum from large towards small scales, we generally find values f sq NL = O(10) and τ col NL = O(10 3 ) in a range of scales that can be probed by CMB µ-space distortions. Using these consistency relations, we carefully analyse how the scale-dependence of non-Gaussian parameters leads to characteristic features in µT and µµ correlators, providing distinctive probes of inflationary PBH scenarios that can be tested using well-understood CMB physics.

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“…It has been shown in [40] that the maximum primordial curvature perturbation slope is ∝ k 4 for single-field inflation, so only a Gaussian with σ 1 can result in this case. Multi-field inflation [41,42] is required for growths steeper than k 4 , which corresponds to a lognormal curvature perturbation of σ < 1. We will restrict to σ ≤ 2 so that we can treat the black holes as forming at approximately the same time and so that we can compare with observational constraints on PBHs with nearly monochromatic mass functions.…”

Section: Primordial Black Holes From Curvature Perturbationsmentioning

confidence: 99%

Signals of primordial black holes at gravitational wave interferometers

Kozaczuk,

Lin,

Villarama

2021

Preprint

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Primordial black holes (PBHs) can form as a result of primordial scalar perturbations at small scales. This PBH formation scenario has associated gravitational wave (GW) signatures from secondorder GWs induced by the primordial curvature perturbation, and from GWs produced during an early PBH dominated era. We investigate the ability of next generation GW experiments, including BBO, LISA, and CE, to probe this PBH formation scenario in a wide mass range (10 − 10 27 g). Measuring the stochastic GW background with GW observatories can constrain the allowed parameter space of PBHs including a previously unconstrained region where light PBHs (< 10 9 g) temporarily dominate the energy density of the universe before evaporating. We also show how PBH formation impacts the reach of GW observatories to the primordial power spectrum and provide constraints implied by existing PBH bounds.

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Turning in the landscape: a new mechanism for generating Primordial Black Holes

Cited by 80 publications

References 0 publications

CMB $μT$ cross-correlations as a probe of PBH scenarios

CMB $μT$ cross-correlations as a probe of PBH scenarios

Consistency conditions and primordial black holes in single field inflation

Signals of primordial black holes at gravitational wave interferometers

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