Time dependent 
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-even and 
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-odd signatures of scalar ultralight dark matter in neutrino oscillations

Losada, Marta; Nir, Yosef; Perez, Gilad; Savoray, Inbar; Shpilman, Yogev

doi:10.1103/physrevd.108.055004

Phys. Rev. D

2023

DOI: 10.1103/physrevd.108.055004

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Time dependent CP -even and CP -odd signatures of scalar ultralight dark matter in neutrino oscillations

Marta Losada,

Yosef Nir,

Gilad Perez

et al.

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2024

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Cited by 3 publications

References 24 publications

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Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy

ChoeJo,

Enomoto,

Kim

et al. 2024

J. High Energ. Phys.

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We propose a novel scenario to explain the matter-antimatter asymmetry by twofold leptogenesis, wherein heavy Majorana neutrinos exhibit temperature-dependent masses and engage in CP-violating decays. This scenario envisages two distinct phases of leptogenesis: one occurring above the electroweak scale and the other below it. The sphaleron process converts the first lepton asymmetry to baryon asymmetry, but not the second one due to its decoupling. This mechanism potentially explains the significant discrepancy between baryon and lepton asymmetries, as suggested by recent observations of Helium-4. Furthermore, our model implies that the present masses of Majorana neutrinos are lighter than the electroweak scale, offering a tangible avenue for experimental verification in various terrestrial settings.

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Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy

ChoeJo,

Enomoto,

Kim

et al. 2024

J. High Energ. Phys.

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Refractive neutrino masses, ultralight dark matter and cosmology

Sen,

Smirnov

2024

J. Cosmol. Astropart. Phys.

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We consider in detail a possibility that the observed neutrino oscillations are due to refraction on ultralight scalar boson dark matter. We introduce the refractive mass squared, m̃2, and study its properties: dependence on neutrino energy, state of the background, etc. If the background is in a state of cold gas of particles, m̃2 shows a resonance dependence on energy. Above the resonance (E ≫ ER ), we find that m̃2 has the same properties as usual vacuum mass squared. Below the resonance, m̃2 decreases with energy, which (if realised) allows to avoid the cosmological bound on the sum of neutrino masses. Also, m̃2 may depend on time. We consider the validity of the results: effects of multiple interactions with scalars, and modification of the dispersion relation. We show that for values of parameters of the system required to reproduce the observed neutrino masses, perturbativity is broken at low energies, which border above the resonance. If the background is in the state of coherent classical field, the refractive mass does not depend on energy explicitly but may show time dependence. It coincides with the refractive mass in a cold gas at high energies. Refractive nature of neutrino mass can be tested by searches of its dependence on energy and time.

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Effects of neutrino-ultralight dark matter interaction on the cosmic neutrino background

Martínez-Miravé,

Perez-Gonzalez,

Sen

2024

Phys. Rev. D

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Ultralight dark matter interacting with sterile neutrinos would modify the evolution and properties of the cosmic neutrino background through active-sterile neutrino mixing. We investigate how such an interaction would induce a redshift dependence in neutrino masses. We highlight that cosmological constraints on the sum of neutrino masses would require reinterpretation due to the effective mass generated by neutrino-dark matter interactions. Furthermore, we present an example where such interactions can alter the mass ordering of neutrinos in the early Universe, compared to what we expect today. We also address the expected changes in the event rates in a PTOLEMY-like experiment, which aims to detect the cosmic neutrino background via neutrino capture and discuss projected constraints. Published by the American Physical Society 2024

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Time dependent CP -even and CP -odd signatures of scalar ultralight dark matter in neutrino oscillations

Cited by 3 publications

References 24 publications

Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy

Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy

Refractive neutrino masses, ultralight dark matter and cosmology

Effects of neutrino-ultralight dark matter interaction on the cosmic neutrino background

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