Constraining dynamical neutrino mass generation with cosmological data

Koksbang, S. M.; Hannestad, Steen

doi:10.1088/1475-7516/2017/09/014

Cited by 16 publications

(19 citation statements)

References 46 publications

(67 reference statements)

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“…the inclusion of the false vacuum energy, is the main reason why our constraints are broader than those reported in Ref. [56]. The preference for a late transition captures the trend that has emerged fitting for neutrino masses with early-and late-time cosmological probes: we confirm that the data require lighter neutrinos at CMB decoupling and more significant masses can be generated only in the late Universe.…”

Section: A Cosmological Mass Limitssupporting

confidence: 77%

“…This parameter was very unconstrained in the analysis of Ref. [56], so we do not expect its exact value to affect our results.…”

Section: Analysis Methodologymentioning

confidence: 96%

“…As described in Ref. [56], the turnover-scale of the matter power spectrum is also affected, depending on the exact time at which the neutrinos gain their mass. As the time of the phase transition moves towards smaller redshifts, the enhancement of the matter power spectrum for large values of k translates into an overall enhancement of the lensing convergence power spectrum (top right panel of Fig.…”

Section: B Cosmological Observablesmentioning

confidence: 96%

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Time-varying neutrino mass from a supercooled phase transition: Current cosmological constraints and impact on the Ωm−σ8 plane

et al. 2019

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In this paper we investigate a time-varying neutrino mass model, motivated by the mild tension between cosmic microwave background (CMB) measurements of the matter fluctuations and those obtained from low-redshift data. We modify the minimal case of the model proposed in Ref.[1] that predicts late neutrino mass generation in a post-recombination cosmic phase transition, by assuming that neutrino asymmetries allow for the presence of relic neutrinos in the late-time Universe. We show that, if the transition is supercooled, current cosmological data (including CMB temperature, polarization and lensing, baryon acoustic oscillations, and Type Ia supernovae) prefer the scale factor as of the phase transition to be very large, peaking at as ∼ 1, and therefore supporting a cosmological scenario in which neutrinos are almost massless until very recent times. We find that in this scenario the cosmological bound on the total sum of the neutrino masses today is significantly weakened compared to the standard case of constant-mass neutrinos, with mν < 4.8 eV at 95% confidence, and in agreement with the model predictions. The main reason for this weaker bound is a large correlation arising between the dark energy and neutrino components in the presence of false vacuum energy that converts into the non-zero neutrino masses after the transition. This result provides new targets for the coming KATRIN and PTOLEMY experiments. We also show that the time-varying neutrino mass model considered here does not provide a clear explanation to the existing cosmological Ωm-σ8 discrepancies.

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Section: A Cosmological Mass Limitssupporting

confidence: 77%

“…This parameter was very unconstrained in the analysis of Ref. [56], so we do not expect its exact value to affect our results.…”

Section: Analysis Methodologymentioning

confidence: 96%

Section: B Cosmological Observablesmentioning

confidence: 96%

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Time-varying neutrino mass from a supercooled phase transition: Current cosmological constraints and impact on the Ωm−σ8 plane

et al. 2019

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“…Thus, if Σ is found to satisfy Σ > 0.10 eV, that would imply that | m | exceeds 5 × 10 −3 eV, unless there exist additional contributions to the (ββ) 0ν -decay amplitude which cancel at least par- tially the contribution due to the 3 light neutrinos. If instead m min < 1.4 × 10 −2 eV, for all (3σ allowed) values of oscillation parameters there is a choice of α 21 and α 31 such that | m | NO < | m | 0 = 5 × 10 −3 eV. These results are shown graphically in Figure 3.…”

Section: The Case Of Normal Orderingmentioning

confidence: 95%

The 10−3 eV frontier in neutrinoless double beta decay

Penedo

Petcov

2018

Physics Letters B

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The observation of neutrinoless double beta decay would allow to establish lepton number violation and the Majorana nature of neutrinos. The rate of this process in the case of 3-neutrino mixing is controlled by the neutrinoless double beta decay effective Majorana mass | m |. For a neutrino mass spectrum with normal ordering, which is favoured over the spectrum with inverted ordering by recent global fits, | m | can be significantly suppressed. Taking into account updated data on the neutrino oscillation parameters, we investigate the conditions under which | m | in the case of spectrum with normal ordering exceeds 10 −3 (5 × 10 −3 ) eV: | m |NO > 10 −3 (5 × 10 −3 ) eV. We analyse first the generic case with unconstrained leptonic CP violation Majorana phases. We show, in particular, that if the sum of neutrino masses is found to satisfy Σ > 0.10 eV, then | m |NO > 5 × 10 −3 eV for any values of the Majorana phases. We consider also cases where the values for these phases are either CP conserving or are in line with predictive schemes combining flavour and generalised CP symmetries.

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“…If the scenario 1+3ν mixing with Inverted Ordering of mass spectrum exist and |m ββ | goes below .01 eV or .05 eV and observed in the near future then sterile parameter must lies within the region shown in Figure 4. For completeness left and right panel of Figure 3 shows the correlation between |m ββ | and the measurable quan-tities m β and for all the possible combination of phases, that will be observed in beta decay experiment [33][34][35], cosmological and astrophysical data [36,37] respectively. Figure 4: Regions in the (m low , φ21) plane where two different conditions on |m ββ |IO apply.…”

Section: Inverted Ordering Configurationmentioning

confidence: 99%

Constraining the Effective Mass of Majorana Neutrino with Sterile Neutrino Mass for Inverted Ordering Spectrum

Singh

2019

Advances in High Energy Physics

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Inspired by the experimental anomalies in neutrino physics and recent oscillation data from short baseline and another neutrino experiment, the realization of one extra neutrino flavor seem to be favoring. This extra flavor may change the observable, |m ββ | of currently data taking and next-generation (ββ)0ν -decay experiments aim to probe and possibly look the Inverted Ordering region(|m ββ | 10 −2 eV) of parameter space. This observation would allow establishing physics beyond the standard model and phenomena like lepton number violation and Majorana nature of neutrino. The range of this observable (|m ββ |) is not very well defined for both the ordering of mass spectrum(Normal Ordering and Inverted Ordering). Several attempts have been made for defining exactly the range for three active neutrino states. For contrasting this range, I have worked with an extra mass states, ν4 and its effect on the observable with various combination of CP violation Majorana phases by taking into account the updated data on the neutrino oscillation parameters for IO case. Based on the monte carlo technique, a parameter region is obtained using the fourth Majorana-Dirac phase of sterile parameters that lead to an effective mass below 0.01 eV or .05 eV for inverted mass ordering case which is planned to be observed in the near future experiment. *

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Constraining dynamical neutrino mass generation with cosmological data

Cited by 16 publications

References 46 publications

Time-varying neutrino mass from a supercooled phase transition: Current cosmological constraints and impact on the Ωm−σ8 plane

Time-varying neutrino mass from a supercooled phase transition: Current cosmological constraints and impact on the Ωm−σ8 plane

The 10−3 eV frontier in neutrinoless double beta decay

Constraining the Effective Mass of Majorana Neutrino with Sterile Neutrino Mass for Inverted Ordering Spectrum

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