Primordial black hole dark matter in dilaton-extended two-field Starobinsky inflation

Gundhi, Anirudh; Ketov, Sergei V.; Steinwachs, Christian F.

doi:10.1103/physrevd.103.083518

Cited by 42 publications

(35 citation statements)

References 116 publications

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“…It is the genuine multi-field inflation effect that cannot be realized in single-field models of inflation, see e.g., Refs. [29,31] for details. Our mechanism of the amplification of curvature perturbations is different from the one employed in Ref.…”

Section: Discussionmentioning

confidence: 99%

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Exploring the parameter space of modified supergravity for double inflation and primordial black hole formation

Ishikawa,

Ketov

2021

Preprint

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We study the parameter space of the effective (with two scalars) models of cosmological inflation and primordial black hole (PBH) formation in the modified (R + R 2 ) supergravity. Our models describe double inflation, whose first stage is driven by Starobinsky's scalaron coming from the R 2 gravity, and whose second stage is driven by another scalar belonging to the supergravity multiplet. The ultra-slow-roll regime between the two stages leads a large peak (enhancement) in the power spectrum of scalar perturbations, which results in efficient PBH formation. Both inflation and PBH formation are generic in our models, while those PBH can account for a significant part or the whole of dark matter. Some of the earlier proposed models in the same class are in tension (over 3σ) with the observed value of the scalar tilt n s , so that we study more general models with more parameters, and investigate the dependence of the cosmological tilts (n s , r) and the scalar power spectrum enhancement upon the parameters. The PBH masses and their density fraction (as part of dark matter) are also calculated. A good agreement (between 2σ and 3σ) with the observed value of n s requires fine tuning of the parameters, and it is only realized in the so-called δ-models. Our models offer the (super)gravitational origin of inflation, PBH and dark matter together, and may be confirmed or falsified by future precision measurements of the cosmic microwave background radiation and PBH-induced gravitational waves.

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Section: Discussionmentioning

confidence: 99%

“…In the case of two-field inflation, those techniques are described at length in Refs. [28,30,31], so that we skip their details here and focus on our new results.…”

Section: Introductionmentioning

confidence: 99%

Exploring the parameter space of modified supergravity for double inflation and primordial black hole formation

Ishikawa,

Ketov

2021

Preprint

Self Cite

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“…As a result, many theoretical studies have appeared in the literature [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], which explain the production of PBH as a fraction of DM of the Universe. This PBH production during the radiation dominance epoch, can be associated to a significant enhancement of the scalar power spectrum.…”

Section: Introductionmentioning

confidence: 99%

“…A severe drawback of these models, is the high level of the necessary fine-tuning, in order to achieve such a big amplification of the power spectrum. For this reason, alternative methods have been proposed to alleviate the issue of the fine-tuning, for example the multi-field inflation models [25][26][27][28][29] or models with a step behavior in the effective scalar potential [23,24,30,31].…”

Section: Introductionmentioning

confidence: 99%

Gravitational Waves and Primordial Black Holes from Supersymmetric Hybrid Inflation

Spanos,

Stamou

2021

Preprint

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We study the effect of supergravity corrections due to a linear and a bilinear term in the Kähler potential, in the context of a supersymmetric hybrid inflation model. By appropriate choice of the parameters associated to these terms, we are able to satisfy the main cosmological constraints for the spectral index n s and the tensorto-scalar ratio r. In addition, this model predicts primordial black hole abundance enough to account for the whole dark matter of the Universe and gravitational wave spectra within the reach of future detection experiments. The predictions of the model can be made compatible to the NANOGrav reported signal, at the cost of significantly lower primordial black hole abundance.

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“…A similar Lagrangian with a priori arbitrary functions B, G, and U has been studied in[103][104][105][106][107] for purely phenomenological reasons. Here we follow ref [91],.…”

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confidence: 99%

Unified emergence of energy scales and cosmic inflation

Kubo

Kuntz

Lindner

et al. 2021

J. High Energ. Phys.

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In the quest for unification of the Standard Model with gravity, classical scale invariance can be utilized to dynamically generate the Planck mass MPl. However, the relation of Planck scale physics to the scale of electroweak symmetry breaking μH requires further explanation. In this paper, we propose a model that uses the spontaneous breaking of scale invariance in the scalar sector as a unified origin for dynamical generation of both scales. Using the Gildener-Weinberg approximation, only one scalar acquires a vacuum expectation value of υS ∼ (1016−17) GeV, thus radiatively generating $$ {M}_{\mathrm{P}1}\approx {\beta}_S^{1/2}{\upsilon}_S $$ M P 1 ≈ β S 1 / 2 υ S and μH via the neutrino option with right handed neutrino masses mN = yMυS ∼ 107 GeV. Consequently, active SM neutrinos are given a mass with the inclusion of a type-I seesaw mechanism. Furthermore, we adopt an unbroken Z2 symmetry and a Z2-odd set of right-handed Majorana neutrinos χ that do not take part in the neutrino option and are able to produce the correct dark matter relic abundance (dominantly) via inflaton decay. The model also describes cosmic inflation and the inflationary CMB observables are predicted to interpolate between those of R2 and linear chaotic inflationary model and are thus well within the strongest experimental constraints.

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Primordial black hole dark matter in dilaton-extended two-field Starobinsky inflation

Cited by 42 publications

References 116 publications

Exploring the parameter space of modified supergravity for double inflation and primordial black hole formation

Exploring the parameter space of modified supergravity for double inflation and primordial black hole formation

Gravitational Waves and Primordial Black Holes from Supersymmetric Hybrid Inflation

Unified emergence of energy scales and cosmic inflation

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