Cosmological Effects of Quantum Vacuum Condensates

Capolupo, Antonio

doi:10.3390/galaxies5040098

Cited by 9 publications

(9 citation statements)

References 68 publications

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“…This large discrepancy leads to a fine-tuning problem [84]. To reconcile the values of the vacuum energy density at cosmological and quantum scales, different solutions have been proposed, such as the anthropic principle or a cyclic model of the Universe [85][86][87][88][89][90]. Comprehensive reviews on the cosmological constant and dark energy are given in [91][92][93].…”

Section: Overview Of the Cold-dark-matter Modelmentioning

confidence: 99%

Dark Matters on the Scale of Galaxies

et al. 2020

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The cold dark-matter model successfully explains both the emergence and evolution of cosmic structures on large scales and, when we include a cosmological constant, the properties of the homogeneous and isotropic Universe. However, the cold dark-matter model faces persistent challenges on the scales of galaxies. Indeed, N-body simulations predict some galaxy properties that are at odds with the observations. These discrepancies are primarily related to the dark-matter distribution in the innermost regions of the halos of galaxies and to the dynamical properties of dwarf galaxies. They may have three different origins: (1) the baryonic physics affecting galaxy formation is still poorly understood and it is thus not properly included in the model; (2) the actual properties of dark matter differs from those of the conventional cold dark matter; (3) the theory of gravity departs from General Relativity. Solving these discrepancies is a rapidly evolving research field. We illustrate some of the solutions proposed within the cold dark-matter model, and solutions when including warm dark matter, self-interacting dark matter, axion-like particles, or fuzzy dark matter. We also illustrate some modifications of the theory of gravity: Modified Newtonian Dynamics (MOND), MOdified Gravity (MOG), and f(R) gravity.

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Section: Overview Of the Cold-dark-matter Modelmentioning

confidence: 99%

Dark Matters on the Scale of Galaxies

et al. 2020

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“…Third, there are some modified gravity models capable of reproducing the observations of galaxy clusters and they are also consistent with data at the galactic level [4][5][6][7][8][9]. Finally, alternative candidates to the CDM paradigm, such as scalar field dark matter and others, have been proposed [10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 71%

Ultra Light Axionic Dark Matter: Galactic Halos and Implications for Observations with Pulsar Timing Arrays

et al. 2018

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The cold dark matter (CDM) paradigm successfully explains the cosmic structure over an enormous span of redshifts. However, it fails when probing the innermost regions of dark matter halos and the properties of the Milky Way’s dwarf galaxy satellites. Moreover, the lack of experimental detection of Weakly Interacting Massive Particle (WIMP) favors alternative candidates such as light axionic dark matter that naturally arise in string theory. Cosmological N-body simulations have shown that axionic dark matter forms a solitonic core of size of ≃150 pc in the innermost region of the galactic halos. The oscillating scalar field associated to the axionic dark matter halo produces an oscillating gravitational potential that induces a time dilation of the pulse arrival time of ≃400 ns/(m B /10 − 22 eV) for pulsar within such a solitonic core. Over the whole galaxy, the averaged predicted signal may be detectable with current and forthcoming pulsar timing array telescopes.

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“…Dark matter, or more precisely cold dark matter, behaves as a pressureless perfect fluid [4]. Accordingly with these constraints, it has been recently shown that vacuum condensates owing to the phenomenon of fermion mixing, like the flavor vacuum energy for neutrinos, satisfy the dark matter equation of state [11][12][13]. This is associated with the fact that the particle mixa e-mail: capolupo@sa.infn.it (corresponding author) b e-mail: sgiampa@irb.hr c e-mail: lambiase@sa.infn.it d e-mail: anquaranta@unisa.it ing phenomenon, together with the Hawking or the Casimir effect etc., have a non-zero vacuum energy which cannot be removed by use of the normal ordering procedure [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Probing quantum field theory particle mixing and dark-matter-like effects with Rydberg atoms

et al. 2020

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We analyze the oscillations of Rydberg atoms in the framework of quantum field theory and analyze the analogy with flavor mixing and oscillations. We reveal a non trivial vacuum energy which has the equation of state analogous to that of cold dark matter. This energy is formally similar to that expected for mixed neutrinos and affects the thermal capacity of the gas. Therefore, deflection of the thermal capacity of Rydberg atoms could prove the condensate structure of vacuum for mixing fermions and open new scenarios in the study of the dark components of the universe. We also derive new Rabi oscillation formulae which are, in principle, testable experimentally.

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Cosmological Effects of Quantum Vacuum Condensates

Cited by 9 publications

References 68 publications

Dark Matters on the Scale of Galaxies

Dark Matters on the Scale of Galaxies

Ultra Light Axionic Dark Matter: Galactic Halos and Implications for Observations with Pulsar Timing Arrays

Probing quantum field theory particle mixing and dark-matter-like effects with Rydberg atoms

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