Brief review of recent advances in understanding dark matter and dark energy

Oks, Eugene

doi:10.1016/j.newar.2021.101632

Cited by 57 publications

(46 citation statements)

References 82 publications

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“…The possible production of dark matter particles by accelerators (see, e.g., [22,23] for reviews) is also actively considered. Theoretical ideas are countless (see, e.g., [24][25][26] for reviews) and new ones appear continuously. At this stage, it fair to conclude that no consensus has emerged.…”

Section: Introductionmentioning

confidence: 99%

The holographic space-time and black hole remnants as dark matter

Barrau

2022

Preprint

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The holographic space-time approach to inflation provides a well defined and self-contained framework to study the early universe. Based on a quasi-local quantum gravity theory generalizing string theory beyond AdS backgrounds, it addresses fundamental questions like the arrow of time and the entropy of the initial cosmological state. It was recently argued that it also provides a naturel explanation for dark matter in the form of primordial black holes. The orignal idea however suffers from troubles that can be cured by considering instead Planck relics. This possibility is investigated and paths for observational confirmation are pointed out.

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Section: Introductionmentioning

confidence: 99%

The holographic space-time and black hole remnants as dark matter

Barrau

2022

Preprint

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“…On the other hand, it also brought to cosmology some of the most challenging problems of modern science. In particular, the knowledge of the nature of dark energy and dark matter is far from being settled [2,3].…”

Section: Introductionmentioning

confidence: 99%

Fermionic wave functions and Grassmann fields as possible sources of dark energy

Brito¹,

Pereira²,

Barboza³

et al. 2022

Preprint

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We study a cosmological model with a fermionic field which can be interpreted as a source of dark energy in the universe. Two different approaches were considered, the first one with the fermion field represented by a standard wave-function and the second one where the field is a Grassmann variable. For this last case, in the massless limit, the intrinsic grassmannian property of the field leads always to a negative pressure contribution, irrespective the specific form of the potential.Both cases leads to a dark energy contribution of the fermionic sector. The models are totally compatible with recent cosmological data from Supernovae and Hubble parameter measurements.A brief study of linear evolution of density perturbations shows that some of the small scale problems related to standard model can be at least alleviated.

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“…In the last few decades many efforts were made to confirm the existence of DM and DE in the sky or in the laboratory experiments, but they were undiscovered, and their existence still remains hypothetical. A brief review of the recent investigations of DM and DE is presented in [3].…”

Section: Introductionmentioning

confidence: 99%

New Cosmological Solutions of a Nonlocal Gravity Model

et al. 2021

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A nonlocal gravity model (2) was introduced and considered recently, and two exact cosmological solutions in flat space were presented. The first solution is related to some radiation effects generated by nonlocal dynamics on dark energy background, while the second one is a nonsingular time symmetric bounce. In the present paper, we investigate other possible exact cosmological solutions and find some the new ones in nonflat space. Used nonlocal gravity dynamics can change the background topology. To solve the corresponding equations of motion, we first look for a solution of the eigenvalue problem □(R−4Λ)=q(R−4Λ). We also discuss possible extension of this model with a nonlocal operator, symmetric under □⟷□−1, and its connection with another interesting nonlocal gravity model.

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Brief review of recent advances in understanding dark matter and dark energy

Cited by 57 publications

References 82 publications

The holographic space-time and black hole remnants as dark matter

The holographic space-time and black hole remnants as dark matter

Fermionic wave functions and Grassmann fields as possible sources of dark energy

New Cosmological Solutions of a Nonlocal Gravity Model

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