Inflation, dark energy, and dark matter in supergravity

Ketov, Sergei V.; Aldabergenov, Yermek

doi:10.1002/asna.201913575

Cited by 4 publications

(8 citation statements)

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“…[20] for a brief review of the existing approaches to embedding the Starobinsky model into supergravity, and Ref. [24] for an inclusion of DM and DE too. Supergravity generically leads to multifield inflation with several scalar fields involved, whereas the Starobinsky inflation model is an example of the single-field inflation.…”

Section: Pos(corfu2021)161mentioning

confidence: 99%

“…The embeddings of inflation into supergravity usually have a single inflaton and suppress other scalars. In this paper we employ the generalized (or modified) Starobinsky-type supergravity [21,[24][25][26][27] in order to describe multi-field inflation. We minimize the particle spectrum by keeping all fields in the same (irreducible) supergravity multiplet, while their interactions are severely restricted by local SUSY.…”

Section: Pos(corfu2021)161mentioning

confidence: 99%

“…In order to numerically evaluate the function (24), we have normalized the values of k in terms of the observable scales today, and the scale k 60 was chosen to represent the largest currently observable scale around 10 −4 Mpc −1 . Then our numerical calculation reveals that the δ c parameter should be a bit smaller than 1/3 (actually, close to δ c = 0.275 in the case under consideration).…”

Section: Pos(corfu2021)161mentioning

confidence: 99%

“…The power spectrum enhancement also takes place, either with a smooth peak for δ ∼ 0.1, or with a sharp peak for δ ∼ 0.6, in the scalar power spectrum. When requiring the PBH density fraction (24) to be close to one and the corresponding density threshold not to deviate far away from the region 1/3 ≤ δ c ≤ 2/3, one finds that the values δ = 0.094 and δ = 0.58, respectively, are suitable for efficient generation of PBH with their masses around 10 19 g, while avoiding their overproduction ( f 1). The results about the δ-models are summarized in Table 4.…”

Section: Pos(corfu2021)161mentioning

confidence: 99%

See 3 more Smart Citations

Formation of primordial black holes after inflation in supergravity

Ketov¹,

Ishikawa²

2022

Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021)

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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 to a large peak (enhancement) in the power spectrum of scalar perturbations, which results in an efficient PBH formation. Both inflation and PBH formation are generic in our models, while these 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 can be realized only 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 the PBH-induced gravitational waves.

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Section: Pos(corfu2021)161mentioning

confidence: 99%

Section: Pos(corfu2021)161mentioning

confidence: 99%

Section: Pos(corfu2021)161mentioning

confidence: 99%

Section: Pos(corfu2021)161mentioning

confidence: 99%

See 2 more Smart Citations

Formation of primordial black holes after inflation in supergravity

Ketov¹,

Ishikawa²

2022

Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021)

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show abstract

“…Dark-matter studies receive considerable attention in fundamental research (see e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]). Various scenarios proposed require new particles in extensions of the Standard Model (SM) (see e.g.…”

Section: Introductionmentioning

confidence: 99%

A generalized Higgs potential with two degenerate minima for a dark QCD matter scenario

2020

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We consider the Higgs potential in generalizations of the Standard Model. The possibility of the potential to develop two almost degenerate minima is explored. This would imply that QCD matter at two distinct sets of quark masses is relevant for astrophysics and cosmology. If in the exotic minimum the QCD matter ground state is electromagnetically neutral, dark matter may consist of QCD matter and antimatter in bubbles of the Higgs field. We predict an abundance of γ rays in the few MeV region as messengers of dark matter regions in space. In addition the ratio of dark matter to normal matter is expected to show a time dependence.

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Rotating dyonic black hole in N=2 , U(1)² gauged supergravity as natural laboratory for high energy particle collisions

Rudra¹,

Nandan²,

Gannouji³

et al. 2020

Class. Quantum Grav.

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In the present work, we explore several gravitational aspects such as energy extraction (via the Penrose process and superradiance), particle collisions around a N = 2 , U(1)2 rotating dyonic black hole (BH) in the gauged supergravity model. The influence of the rotation parameter (a) and the gauge coupling constant (g) on the behavior of the horizon and ergoregion of the BH is investigated. In comparison to the extremal Kerr BH, the gauge coupling constant, under certain constraints, can interestingly enhance the maximum efficiency of energy extraction through the Penrose process by almost twice. Under the same constraints, we can extract approximately 60.75% of the initial mass-energy from the BH which is noticeably higher and far different from that of the Kerr BH. The limit of energy extraction in terms of the local speeds of the fragments is also determined with the help of the Wald inequality. We discover an upper limit on the gauge coupling constant up to which superradiance is likely to occur. Finally, we estimate the center-of-mass energy (E CM) of two particles with the same rest mass moving in the equatorial plane of the BH. Our study also aims to sensitize E CM to the parameters a and g for both extremal and nonextremal spacetime. Especially, for the extremal case, an infinitely large amount of E CM can be achieved closer to the event horizon confirming a basic point of view that an extreme supergravity BH with dyons could serve as ultimate particle accelerators as compared to Kerr and any other generalized BHs in this family and other alternative theories of gravity. However, E CM for the nonextremal spacetime is shown to be finite and has an upper bound.

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Inflation, dark energy, and dark matter in supergravity

Cited by 4 publications

References 31 publications

Formation of primordial black holes after inflation in supergravity

Formation of primordial black holes after inflation in supergravity

A generalized Higgs potential with two degenerate minima for a dark QCD matter scenario

Rotating dyonic black hole in N=2 , U(1)² gauged supergravity as natural laboratory for high energy particle collisions

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Inflation, dark energy, and dark matter in supergravity

Cited by 4 publications

References 31 publications

Formation of primordial black holes after inflation in supergravity

Formation of primordial black holes after inflation in supergravity

A generalized Higgs potential with two degenerate minima for a dark QCD matter scenario

Rotating dyonic black hole in N=2 , U(1)2 gauged supergravity as natural laboratory for high energy particle collisions

Contact Info

Product

Resources

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Rotating dyonic black hole in N=2 , U(1)² gauged supergravity as natural laboratory for high energy particle collisions