Inflation models in the light of self-interacting sterile neutrinos

Mazumdar, Arindam; Mohanty, Sanghamitra; Parashari, Priyank

doi:10.1103/physrevd.101.083521

“…In reference [704] electroweak precision observables are taken into account, while in reference [705] the effective four-neutrino interaction is supposed to be generated by the exchange of a light mediator. In reference [706] a separate analysis with IceCube data is performed, and this concludes that the strong neutrino self-interactions region preferred by cosmology is disfavoured for both flavour specific and universal cases. In reference [707] it is pointed out that neutrino self-interactions induced by a very light or massless mediator cannot resolve the Hubble tension below 3.4σ (H 0 = 68.12 ± 0.69 km s −1 Mpc −1 at 68% CL from Planck 2015), hence in reference [708] self-interacting Dirac neutrinos via a light-dark-photon mediator are explored.…”

Section: Self-interacting Neutrinosmentioning

confidence: 98%

In the realm of the Hubble tension—a review of solutions ^*

Valentino

¹

,

Mena²,

Pan³

et al. 2021

Class. Quantum Grav.

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The simplest ΛCDM model provides a good fit to a large span of cosmological data but harbors large areas of phenomenology and ignorance. With the improvement of the number and the accuracy of observations, discrepancies among key cosmological parameters of the model have emerged. The most statistically significant tension is the 4σ to 6σ disagreement between predictions of the Hubble constant, H 0, made by the early time probes in concert with the ‘vanilla’ ΛCDM cosmological model, and a number of late time, model-independent determinations of H 0 from local measurements of distances and redshifts. The high precision and consistency of the data at both ends present strong challenges to the possible solution space and demands a hypothesis with enough rigor to explain multiple observations—whether these invoke new physics, unexpected large-scale structures or multiple, unrelated errors. A thorough review of the problem including a discussion of recent Hubble constant estimates and a summary of the proposed theoretical solutions is presented here. We include more than 1000 references, indicating that the interest in this area has grown considerably just during the last few years. We classify the many proposals to resolve the tension in these categories: early dark energy, late dark energy, dark energy models with 6 degrees of freedom and their extensions, models with extra relativistic degrees of freedom, models with extra interactions, unified cosmologies, modified gravity, inflationary models, modified recombination history, physics of the critical phenomena, and alternative proposals. Some are formally successful, improving the fit to the data in light of their additional degrees of freedom, restoring agreement within 1–2σ between Planck 2018, using the cosmic microwave background power spectra data, baryon acoustic oscillations, Pantheon SN data, and R20, the latest SH0ES Team Riess, et al (2021 Astrophys. J. 908 L6) measurement of the Hubble constant (H 0 = 73.2 ± 1.3 km s−1 Mpc−1 at 68% confidence level). However, there are many more unsuccessful models which leave the discrepancy well above the 3σ disagreement level. In many cases, reduced tension comes not simply from a change in the value of H 0 but also due to an increase in its uncertainty due to degeneracy with additional physics, complicating the picture and pointing to the need for additional probes. While no specific proposal makes a strong case for being highly likely or far better than all others, solutions involving early or dynamical dark energy, neutrino interactions, interacting cosmologies, primordial magnetic fields, and modified gravity provide the best options until a better alternative comes along.

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“…The VEV of the sterile Higgs (H s ) breaks the U(1) s gauge group and leads to a massive gauge boson. This particle can mediate the so-called secret interactions of the sterile neutrinos proposed in the cosmological context [66][67][68]. The VEV of the sterile Higgs is assumed to be an order of magnitude higher than the VEV of the SM Higgs, i.e.…”

Section: Jhep09(2020)050mentioning

confidence: 99%

“…The broken U(1) s gauge symmetry in our model will lead to a massive gauge boson which can mediate such an interaction. For a detailed discussion about the cosmological implications of sterile neutrinos having secret interactions, please see the references [66][67][68].…”

Section: Jhep09(2020)050mentioning

confidence: 99%

Realization of the minimal extended seesaw mechanism and the TM2 type neutrino mixing

Krishnan

¹

,

Mukherjee

²

,

Goswami

³

2020

J. High Energ. Phys.

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We construct a neutrino mass model based on the flavour symmetry group A4×C4×C6×C2 which accommodates a light sterile neutrino in the minimal extended seesaw (MES) scheme. Besides the flavour symmetry, we introduce a U(1) gauge symmetry in the sterile sector and also impose CP symmetry. The vacuum alignments of the scalar fields in the model spontaneously break these symmetries and lead to the construction of the fermion mass matrices. With the help of the MES formulas, we extract the light neutrino masses and the mixing observables. In the active neutrino sector, we obtain the TM2 mixing pattern with non-zero reactor angle and broken μ-τ reflection symmetry. We express all the active and the sterile oscillation observables in terms of only four real model parameters. Using this highly constrained scenario we predict $$ {\sin}^2{\theta}_{23}={0.545}_{-0.004}^{+0.003},\sin \delta =-{0.911}_{-0.005}^{+0.006},{\left|{U}_{e4}\right|}^2={0.029}_{-0.008}^{+0.009},{\left|{U}_{\mu 4}\right|}^2={0.010}_{-0.003}^{+0.003}\kern0.5em \mathrm{and}\kern0.5em {\left|{U}_{\tau 4}\right|}^2={0.006}_{-0.002}^{+0.002} $$ sin 2 θ 23 = 0.545 − 0.004 + 0.003 , sin δ = − 0.911 − 0.005 + 0.006 , U e 4 2 = 0.029 − 0.008 + 0.009 , U μ 4 2 = 0.010 − 0.003 + 0.003 and U τ 4 2 = 0.006 − 0.002 + 0.002 which are consistent with the current data.

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“…On the other hand, Refs. [121][122][123][124][125] did include a transition from fluid to free streaming, but without a mechanism (such as changing Y P ) to scale up the photon scattering rate.…”

Section: Labelmentioning

confidence: 99%

Symmetry of Cosmological Observables, and a High Hubble Constant as an Indicator of a Mirror World Dark Sector

Cyr-Racine,

Ge,

Knox

2021

Preprint

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We point out a previously unnoticed symmetry of many important cosmological observables and show that a cosmological model with a "mirror world" dark sector can exploit this symmetry to completely eliminate the Hubble tension. Our work motivates searches for both a more detailed particle physics model that satisfies laboratory constraints and a means of increasing the cosmic photon scattering rate that respects observational bounds on the primordial helium abundance.

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Inflation models in the light of self-interacting sterile neutrinos

Cited by 15 publications

References 108 publications

In the realm of the Hubble tension—a review of solutions ^*

In the realm of the Hubble tension—a review of solutions ^*

Realization of the minimal extended seesaw mechanism and the TM2 type neutrino mixing

Symmetry of Cosmological Observables, and a High Hubble Constant as an Indicator of a Mirror World Dark Sector

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Inflation models in the light of self-interacting sterile neutrinos

Cited by 15 publications

References 108 publications

In the realm of the Hubble tension—a review of solutions *

In the realm of the Hubble tension—a review of solutions *

Realization of the minimal extended seesaw mechanism and the TM2 type neutrino mixing

Symmetry of Cosmological Observables, and a High Hubble Constant as an Indicator of a Mirror World Dark Sector

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Product

Resources

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In the realm of the Hubble tension—a review of solutions ^*

In the realm of the Hubble tension—a review of solutions ^*