Inverse Seesaw, dark matter and the Hubble tension

Fernandez-Martinez, Enrique; Pierre, Mathias; Pinsard, Emanuelle; Rosauro-Alcaraz, Salvador

doi:10.48550/arxiv.2106.05298

Cited by 5 publications

(5 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The idea to tie the physics of early dark energy to neutrino physics has been discussed in a different context in[32,36],where a conformal coupling to the neutrino sector (similar to[63]) kicks off the early dark energy epoch when neutrinos become non-relativistic. In[45,51,64,65], on the other hand, the neutrino mass generation has been discussed in the context of the Hubble tension yet without relating it to an EDE/NEDE phase transition.…”

mentioning

confidence: 99%

New early dark energy

2021

View full text Add to dashboard Cite

New measurements of the expansion rate of the Universe have plunged the standard model of cosmology into a severe crisis. In this paper, we propose a simple resolution to the problem that relies on a first order phase transition in a dark sector in the early Universe, before recombination. This will lead to a short phase of a new early dark energy (NEDE) component and can explain the observations. We model the false vacuum decay of the NEDE scalar field as a sudden transition from a cosmological constant source to a decaying fluid with constant equation of state. The corresponding fluid perturbations are covariantly matched to the adiabatic fluctuations of a subdominant scalar field that triggers the phase transition. Fitting our model to measurements of the cosmic microwave background (CMB), baryonic acoustic oscillations (BAO, and supernovae (SNe) yields a significant improvement of the best fit compared with the standard cosmological model without NEDE. We find the mean value of the present Hubble parameter in the NEDE model to be H 0 ¼ 71.4 AE 1.0 km s −1 Mpc −1 (68% C.L.).

show abstract

mentioning

confidence: 99%

New early dark energy

2021

View full text Add to dashboard Cite

show abstract

“…Our scenario is a variation of the one proposed in [27,28] (see also [29]); in particular, it implies the same type of majoron coupling to neutrinos, λ ν ≈ m ν /v X . However, our proposal can also accommodate tiny couplings to the charged leptons that induce the dimension-5 operator φ F µν F µν : this is an axion-like majoron (ALM).…”

Section: Introductionmentioning

confidence: 83%

Cosmology of an Axion-Like Majoron

Cuesta,

Gómez,

Illana

et al. 2021

Preprint

View full text Add to dashboard Cite

We propose a singlet majoron model that defines an inverse seesaw mechanism in the ν sector. The majoron φ has a mass m φ ≈ 0.5 eV and a coupling to the τ lepton similar to the one to neutrinos. In the early universe it is initially in thermal equilibrium, then it decouples at T ≈ 500 GeV and contributes with just ∆N eff = 0.026 during BBN. At T = 26 keV (final stages of BBN) a primordial magnetic field induces resonant γ ↔ φ oscillations that transfer 6% of the photon energy into majorons, implying ∆N eff = 0.55 and a 4.7% increase in the baryon to photon ratio. At T ≈ m φ the majoron enters in thermal contact with the heaviest neutrino and it finally decays into ν ν pairs near recombination, setting ∆N eff = 0.85. This boost in the expansion rate at later times solves the Hubble tension, while the neutrino-majoron interactions suppress the ν free streaming and make the model consistent with large scale structure observations. Its lifetime and the fact that it decays into neutrinos instead of photons lets this axion-like majoron avoid the strong bounds that affect other axion-like particles of similar mass and coupling to photons.

show abstract

“…Although the idea of a dynamical origin for these small parameters is not new, see for example Refs. [48][49][50][51][52], it is the first time that it is linked to the flavour problem. In particular, we argue that, in order to explain the smallness of µ ( ) and , instead of the usual choice of lepton number, a larger symmetry can be considered, providing further links to the quark sector.…”

Section: Introductionmentioning

confidence: 99%

Dynamical Minimal Flavour Violating Inverse Seesaw

Arias-Aragón¹,

Fernández‐Martínez²,

González-López³

et al. 2022

Preprint

View full text Add to dashboard Cite

The Inverse Seesaw mechanism is dynamically realised within the Minimal Lepton Flavour Violation context. Lepton number, whose breaking is spontaneously realised, is generalised to a global Abelian factor of the whole flavour symmetry, that also plays the role of the Peccei-Quinn symmetry. The associated Goldstone boson is a Majoraxion that solves the Strong CP problem and represents a Dark Matter candidate.Three distinct scenarios are identified in terms of flavour symmetry and transformation properties of the exotic neutral leptons that enrich the Standard Model spectrum. The associated phenomenology is studied, focusing on the deviations from unitarity of the PMNS mixing matrix. The strongest constraints arise from the determination of the number of active neutrinos through the invisible width of the Z, the comparison of the measured W boson mass with its prediction in terms of the Fermi constant from muon decay, and the null searches for the radiative rare muon decay and µ → e conversion in nuclei. The heavy neutral leptons may have masses of a few TeV, leaving open the possibility for a direct detection at future colliders.The impact of the recent measurement of the W mass at the CDF II detector has also been considered, which, in one of the scenarios, points to a sharp prediction for the masses of the heavy neutral leptons at about 2 − 3 TeV.

show abstract

Inverse Seesaw, dark matter and the Hubble tension

Cited by 5 publications

References 71 publications

New early dark energy

New early dark energy

Cosmology of an Axion-Like Majoron

Dynamical Minimal Flavour Violating Inverse Seesaw

Contact Info

Product

Resources

About