Determining the neutrino lifetime from cosmology

Chacko, Zackaria; Dev, Abhish; Du, Peizhi; Poulin, Vivian; Tsai, Yuhsin

doi:10.1103/physrevd.103.043519

Cited by 36 publications

(39 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, as discussed in Refs. [19,57], a combination of CMB data with future tomographic measurements of the power spectrum by DESI [58] or Euclid [59], and an improved determination of the optical depth to reionization by 21-cm observations with SKA [60,61], could greatly increase the sensitivity of cosmological probes to neutrino masses and lifetimes.…”

Section: Comparison With Former Results and The Impact Of Planck 2018...mentioning

confidence: 99%

“…Finally, let us mention that even though current exclusion bounds in Fig. 6 do not set independent constraints on the neutrino mass and lifetime, next generation measurements of the matter power spectrum at different redshifts can help break that degeneracy [19]. It will be interesting to revisit the forecast on the sensitivity of future cosmological data to the sum of neutrino masses and their lifetime in light of our improved formalism.…”

Section: Discussionmentioning

confidence: 99%

“…[18], Planck 2015 and LSS data were used to place constraints on the neutrino mass as a function of the lifetime, and found that values of m ν as large as 0.9 eV were still allowed by the data. Future LSS measurements at higher redshifts may be able to break the degeneracy between the neutrino mass and lifetime and measure these parameters independently [19]. It is worth noting that there are also bounds on the neutrino lifetime from Supernova 1987A [20], solar neutrinos [21][22][23][24], astrophysical neutrinos measured at IceCube [25][26][27][28][29][30], atmospheric neutrinos and long baseline experiments [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improved cosmological constraints on the neutrino mass and lifetime

Abellán,

Chacko,

Dev

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

We present cosmological constraints on the sum of neutrino masses as a function of the neutrino lifetime, in a framework in which neutrinos decay into dark radiation after becoming nonrelativistic. We find that in this regime the cosmic microwave background (CMB), baryonic acoustic oscillations (BAO) and (uncalibrated) luminosity distance to supernovae from the Pantheon catalog constrain the sum of neutrino masses m ν to obey m ν < 0.42 eV at (95% C.L.). While the the bound has improved significantly as compared to the limits on the same scenario from Planck 2015, it still represents a significant relaxation of the constraints as compared to the stable neutrino case. We show that most of the improvement can be traced to the more precise measurements of low-polarization data in Planck 2018, which leads to tighter constraints on τ reio (and thereby on A s ), breaking the degeneracy arising from the effect of (large) neutrino masses on the amplitude of the CMB power spectrum.

show abstract

Section: Comparison With Former Results and The Impact Of Planck 2018...mentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved cosmological constraints on the neutrino mass and lifetime

Abellán,

Chacko,

Dev

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…It corresponds to the minimal mass for which the majoron can decay into the most massive neutrino m φ ≥ 2 | m 2 atm | = 0.1 eV. For smaller masses the majoron could potentially participate in the process of neutrino decay leading to a very different phenomenology [121,[132][133][134][135][136]. This, however, will in fact not occur within the framework of the singlet majoron model considered here, see [59].…”

Section: Planck Analysismentioning

confidence: 97%

The hubble tension as a hint of leptogenesis and neutrino mass generation

Escudero

Witte

2021

Eur. Phys. J. C

View full text Add to dashboard Cite

The majoron, a neutrinophilic pseudo-Goldstone boson conventionally arising in the context of neutrino mass models, can damp neutrino free-streaming and inject additional energy density into neutrinos prior to recombination. The combination of these effects for an eV-scale mass majoron has been shown to ameliorate the outstanding $$H_0$$ H 0 tension, however only if one introduces additional dark radiation at the level of $$\Delta N_{\mathrm{eff}} \sim 0.5$$ Δ N eff ∼ 0.5 . We show here that models of low-scale leptogenesis can naturally source this dark radiation by generating a primordial population of majorons from the decays of GeV-scale sterile neutrinos in the early Universe. Using a posterior predictive distribution conditioned on Planck2018+BAO data, we show that the value of $$H_0$$ H 0 observed by the SH$$_0$$ 0 ES collaboration is expected to occur at the level of $$\sim 10\%$$ ∼ 10 % in the primordial majoron cosmology (to be compared with $$\sim 0.1\%$$ ∼ 0.1 % in the case of $$\Lambda $$ Λ CDM). This insight provides an intriguing connection between the neutrino mass mechanism, the baryon asymmetry of the Universe, and the discrepant measurements of $$H_0$$ H 0 .

show abstract

“…A variety of future surveys will be sensitive enough to measure a minimum sum of neutrino masses m ν = 58 meV, at 2-5σ [43]. Given the long timescales relevant to cosmology, these observations also place stringent constraints on the neutrino lifetime [44,45].…”

Section: Introductionmentioning

confidence: 99%

Neutrino interactions in the late universe

Green

Kaplan

Rajendran

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

The cosmic neutrino background is both a dramatic prediction of the hot Big Bang and a compelling target for current and future observations. The impact of relativistic neutrinos in the early universe has been observed at high significance in a number of cosmological probes. In addition, the non-zero mass of neutrinos alters the growth of structure at late times, and this signature is a target for a number of upcoming surveys. These measurements are sensitive to the physics of the neutrino and could be used to probe physics beyond the standard model in the neutrino sector. We explore an intriguing possibility where light right-handed neutrinos are coupled to all, or a fraction of, the dark matter through a mediator. In a wide range of parameter space, this interaction only becomes important at late times and is uniquely probed by late-time cosmological observables. Due to this coupling, the dark matter and neutrinos behave as a single fluid with a non-trivial sound speed, leading to a suppression of power on small scales. In current and near-term cosmological surveys, this signature is equivalent to an increase in the sum of the neutrino masses. Given current limits, we show that at most 0.5% of the dark matter could be coupled to neutrinos in this way.

show abstract

Determining the neutrino lifetime from cosmology

Cited by 36 publications

References 63 publications

Improved cosmological constraints on the neutrino mass and lifetime

Improved cosmological constraints on the neutrino mass and lifetime

The hubble tension as a hint of leptogenesis and neutrino mass generation

Neutrino interactions in the late universe

Contact Info

Product

Resources

About