Galaxy Formation With Ultralight Bosonic Dark Matter

Veltmaat, Jan

doi:10.53846/goediss-7975

Cited by 1 publication

(1 citation statement)

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“…where t i is the time set by the spontaneous symmetry breaking of the global symmetry, f φ represents the energy scale of the symmetry breaking, θ φ is the initial phase, and φ ≡ dφ/dt. At the quantum field level, the ultralight DM produced by the misalignment mechanism (from the dynamical symmetry breaking) should be descried by a coherent state of the form [8,14,[41][42][43][44][45][46][47]…”

Section: Cosmological Evolutionmentioning

confidence: 99%

Neutrino meets ultralight dark matter: 0νββ decay and cosmology

Huang

Nath

2022

J. Cosmol. Astropart. Phys.

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We explore the neutrinoless double beta (0νββ) decay induced by an ultralight dark matter field coupled to neutrinos. The effect on 0νββ decay is significant if the coupling violates the lepton number, for which the ΔL = 2 transition is directly driven by the dark matter field without further suppression of small neutrino masses. As the ultralight dark matter can be well described by a classical field, the effect features a periodic modulation pattern in decay events. However, we find that in the early Universe such coupling will be very likely to alter the standard cosmological results. In particular, the requirement of neutrino free-streaming before the matter-radiation equality severely constrains the parameter space, such that the future 0νββ decay experiments can hardly see any signal even with a meV sensitivity to the effective neutrino mass.

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