Minimal Starobinsky supergravity coupled to a dilaton-axion superfield

Aldabergenov, Yermek; Aoki, Shuntaro; Ketov, Sergei V.

doi:10.1103/physrevd.101.075012

Cited by 5 publications

(4 citation statements)

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“…Here it is worthwhile to mention that (i) modified supergravity always leads to the no-scale Kähler potential (20) that often arises in superstring compactifications (see e.g., Ref. [59]), and (ii) there is a possibility of interpreting (some) modified supergravity theories as the D3-brane worldvolume theories in type II superstrings [60,61]. Thus, the exploration of cosmological predictions from modified supergravity provides a remarkable bridge between quantum gravity on one side and phenomenology of inflation and PBHs on the other side.…”

Section: Conclusion and Commentsmentioning

confidence: 99%

Primordial black holes from modified supergravity

2020

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The modified supergravity approach is applied to describe a formation of Primordial Black Holes (PBHs) after Starobinsky inflation. Our approach naturally leads to the two-(scalar)-field attractor-type double inflation, whose first stage is driven by scalaron and whose second stage is driven by another scalar field which belongs to a supergravity multiplet. The scalar potential and the kinetic terms are derived, the vacua are studied, and the inflationary dynamics of those two scalars is investigated. We numerically compute the power spectra and we find the ultra-slow-roll regime leading to an enhancement (peak) in the scalar power spectrum. This leads to an efficient formation of PBHs. We estimate the masses of PBHs and we find their density fraction (as part of Dark Matter). We show that our modified supergravity models are in agreement with inflationary observables, while they predict the PBH masses in a range between $$10^{16}$$ 10 16 g and $$10^{20}$$ 10 20 g. In this sense, modified supergravity provides a natural top-down approach for explaining and unifying the origin of inflation and the PBHs Dark Matter.

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Section: Conclusion and Commentsmentioning

confidence: 99%

Primordial black holes from modified supergravity

2020

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“…Here it is worthwhile to mention that (i) modified supergravity always leads to the no-scale Kähler potential (20) that often arises in superstring compactifications (see e.g., Ref. [57]), and (ii) there is a possibility of interpreting (some) modified supergravity theories as the D3-brane worldvolume theories in type II superstrings [58,59]. Thus, the exploration of cosmological predictions from modified supergravity provides a remarkable bridge between quantum gravity on one side and phenomenology of inflation and PBHs on the other side.…”

Section: The δ-Extensionmentioning

confidence: 99%

Primordial black holes from modified supergravity

Aldabergenov,

Addazi,

Ketov

2020

Preprint

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The modified supergravity approach is applied to describe a formation of Primordial Black Holes (PBHs) after Starobinsky inflation. Our approach naturally leads to the two-(scalar)-field attractor-type double inflation, whose first stage is driven by scalaron and whose second stage is driven by another scalar field which belongs to a supergravity multiplet. The scalar potential and the kinetic terms are derived, the vacua are studied, and the inflationary dynamics of those two scalars is investigated. We numerically compute the power spectra and we find the ultra-slow-roll regime leading to an enhancement (peak) in the scalar power spectrum. This leads to an efficient formation of PBHs. We estimate the masses of PBHs and we find their density fraction (as part of Dark Matter). We show that our modified supergravity models are in agreement with inflationary observables, while they predict the PBH masses in a range between 10 16 g and 10 23 g. In this sense, modified supergravity provides a natural top-down approach for explaining and unifying the origin of inflation and the PBHs Dark Matter.

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“…Further details for the exact procedure can be found in [26]. Further discussions on the cosmological properties of a massive vector multiplet can be found in [53,54,55,56].…”

Section: Pos(corfu2019)135mentioning

confidence: 99%