Review of Solutions to the Cusp-Core Problem of the ΛCDM Model

Popolo, A. Del; Delliou, Morgan Le

doi:10.3390/galaxies9040123

Cited by 15 publications

(3 citation statements)

References 290 publications

(511 reference statements)

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“…The 1/r divergence is called a cusp. However, dark matter cores are often observed to be flat, and the issue is called the "cusp-core problem"; for recent reviews, see (Boldrini, 2021;Del Popolo and Le Delliou, 2021). Dark matter halos seem to have stopped growing: those of nearby quasars are not heavies than those at z ∼ 6 (Arita et al, 2023).…”

Section: Evidence For Constant-density Non-cusped Coresmentioning

confidence: 99%

Solution of the dark matter riddle within standard model physics: from black holes, galaxies and clusters to cosmology

Nieuwenhuizen

2024

Front. Astron. Space Sci.

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It is postulated that the energy density of the (quantum) vacuum acts firstly as dark energy and secondly as a part of dark matter. Assisted by electric fields arising from a small charge mismatch in the cosmic plasma, it can condense on mass concentrations. No longer participating in the cosmic expansion, this constitutes “electro-aether-energy” (EAE), “electro-zero-point-energy” or “electro-vacuum-energy”, which solves the dark matter riddle without new physics. A radial electric field of 1 kV/m is predicted in the Galaxy. For proper electric fields, EAE can cover the results deduced with MOND. An instability allows a speedy filling of dark matter cores. Hydrostatic equilibrium in galaxy clusters is obeyed. Flowing in aether energy of explains why black holes become supermassive, do not have mass gaps and overcome the final parsec problem. Rupture of charged clouds reduces, e.g., the primordial baryon cloud to the cosmic web. The large coherence scale of the electric field acts as a scaffold for gentle galaxy formation and their vast polar structures. In galaxy merging and bars, there occurs no dynamical friction. At cosmological scales, EAE acts as pressureless dark matter. Its amount increases in time, which likely solves the Hubble tension by its late time physics. A big crunch can occur. Of the large cosmological constant injected at the Big Bang, a small part kept that form, without fine-tuning.

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Section: Evidence For Constant-density Non-cusped Coresmentioning

confidence: 99%

Solution of the dark matter riddle within standard model physics: from black holes, galaxies and clusters to cosmology

Nieuwenhuizen

2024

Front. Astron. Space Sci.

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“…The 1/r divergence is called a cusp. However, dark matter cores are often observed to be flat, and the issue is called the "cusp-core problem"; for recent reviews, see [67,68]. For EZPE we recall that eq.…”

Section: Evidence For Constant-density Non-cusped Coresmentioning

confidence: 99%

Solution of the dark matter riddle within standard model physics: From galaxies and clusters to cosmology

Nieuwenhuizen¹

2023

Preprint

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It is postulated that the zero point energy density of the quantum vacuum acts firstly as dark energy and secondly as a fluid that builds the dark matter. Assisted by a small fraction of net charges in a cosmic plasma, zero point energy can condense on mass concentrations. No longer participating in the cosmic expansion, they constitute "electro-zero-point energy" (EZPE), which offers a solution to the dark matter riddle without new physics. An electric field of 1 kV/m pointing from the center of the Galaxy is predicted. EZPE can cover the results deduced with MOND. Instability of linear perturbations motivates a speedy filling of a constant-density dark matter core. EZPE solves the hydrostatic equilibrium puzzle in galaxy clusters. Cool cluster cores may result from expanding cores. Flowing in of EZPE explains why early black holes can become supermassive, why they can have any mass and overcome the final parsec problem when merging. EZPE implies rupture of clouds, e.g., reducing the primordial baryon cloud to the cosmic web. The large coherence scale of the electric field acts as a scaffold for gentle galaxy formation and their vast polar structures. In galaxy merging and galactic bars, EZPE does not cause dynamical friction. At cosmological scales, it acts as pressureless dark matter. Its energy density increases in time, which softens the Hubble tension by late time physics. Of the large cosmological constant injected at the big bang, a small part remains. At early times, inflation occurs automatically. Contents 9.1.4 Feeding of (supermassive) black holes 29 9.1.5 Absence of mass gaps for black holes 30 9.2 Galaxies 30 9.2.1 The EZPE scaffold 30 9.2.2 Seeding of magnetic fields 30 9.2.3 No dynamical friction in merging and bars 30 9.2.4 Gentle structure formation 30 9.2.5 First black holes, then galaxies 31 9.2.6 Vast polar structure of satellites 31 9.2.7 Tidal stripping of dark matter 31 9.3 Clusters 31 9.3.1 Cool cluster cores 31 9.3.2 Intracluster light 31 9.4 The cosmos 32 9.4.1 Cosmic web 32 9.4.2 Rupture of baryon clouds 32 9.4.3 The Cold Spot 32 9.4.4 The axis of evil 32 9.4.5 The Bullet Cluster 33 9.4.6 Primordial black holes 33 9.4.7 Nucleosynthesis and cosmic rays 33 10 Conclusion 34

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“…Among the current small-scale issues of the ΛCDM model, the most persistent ones are the so-called missing satellite and the cusp-core problems [4,67]. Both these observational-theoretical conflicts could be solved by questioning the cold dark matter paradigm and assuming an alternative ("warm") dark matter particle [68].…”

Section: Dark Matter Distribution At High-zmentioning

confidence: 99%

Cosmological studies with VLBI

Spingola¹

2023

Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022)

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Current cosmological controversies can be solved if a sufficient level of precision is achieved by observations. Future surveys with the next generation of telescopes will offer significantly improved depth and angular resolution with respect to existing observations, opening the socalled "era of precision cosmology". But, that era can be considered already started at the radio wavelengths with Very Long Baseline Interferometry (VLBI). In this paper, we give an overview on how VLBI is contributing to some open questions in contemporary cosmology by reaching simultaneously the largest distances and the smallest scales.

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Review of Solutions to the Cusp-Core Problem of the ΛCDM Model

Cited by 15 publications

References 290 publications

Solution of the dark matter riddle within standard model physics: from black holes, galaxies and clusters to cosmology

Solution of the dark matter riddle within standard model physics: from black holes, galaxies and clusters to cosmology

Solution of the dark matter riddle within standard model physics: From galaxies and clusters to cosmology

Cosmological studies with VLBI

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