MSW effect in a fluctuating matter density

Balantekin, A. B.; Fetter, J. M.; Loreti, F.

doi:10.1103/physrevd.54.3941

Cited by 59 publications

(72 citation statements)

References 22 publications

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“…This topic has been widely investigated in the literature [56,57,58,59,60,61,62,63,64,65], and quantitative upper limits have already been set [61,62,63,64] by combining solar data and first KamLAND results.…”

Section: Recovering the Case Of Density Fluctuations In The Sunmentioning

confidence: 99%

Probing nonstandard decoherence effects with solar and KamLAND neutrinos

et al. 2007

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It has been speculated that quantum gravity might induce a "foamy" space-time structure at small scales, randomly perturbing the propagation phases of free-streaming particles (such as kaons, neutrons, or neutrinos). Particle interferometry might then reveal non-standard decoherence effects, in addition to standard ones (due to, e.g., finite source size and detector resolution.) In this work we discuss the phenomenology of such non-standard effects in the propagation of electron neutrinos in the Sun and in the long-baseline reactor experiment KamLAND, which jointly provide us with the best available probes of decoherence at neutrino energies E ∼ few MeV. In the solar neutrino case, by means of a perturbative approach, decoherence is shown to modify the standard (adiabatic) propagation in matter through a calculable damping factor. By assuming a power-law dependence of decoherence effects in the energy domain (E n with n = 0, ±1, ±2), theoretical predictions for two-family neutrino mixing are compared with the data and discussed. We find that neither solar nor KamLAND data show evidence in favor of non-standard decoherence effects, whose characteristic parameter γ 0 can thus be significantly constrained. In the "Lorentz-invariant" case n = −1, we obtain the upper limit γ 0 < 0.78 × 10 −26 GeV at 95% C.L. In the specific case n = −2, the constraints can also be interpreted as bounds on possible matter density fluctuations in the Sun, which we improve by a factor of ∼ 2 with respect to previous analyses.

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Section: Recovering the Case Of Density Fluctuations In The Sunmentioning

confidence: 99%

Probing nonstandard decoherence effects with solar and KamLAND neutrinos

et al. 2007

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“…7 Be flux found in the former. Here the different regions in dashed and dot-dashed are associated with a non-zero level of random fluctuations fluctuations in the solar matter density [69]. The existence of such noise-type fluctuations is not excluded by the SSM nor by present helioseismology studies.…”

Section: Solar Neutrinosmentioning

confidence: 99%

Neutrinos and physics beyond the standard model

Valle¹

1997

Nuclear Physics B - Proceedings Supplements

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A brief sketch is made of the present observational status of neutrino physics, with emphasis on the hints that follow from solar and atmospheric neutrino observations, as well as cosmological data on the amplitude of primordial density fluctuations. I also briefly review the ways to account for the observed anomalies and some of their implications. A brief sketch is made of the present observational status of neutrino physics, with emphasis on the hints that follow from solar and atmospheric neutrino observations, as well as cosmological data on the amplitude of primordial density fluctuations. I also briefly review the ways to account for the observed anomalies and some of their implications.

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“…One should also point out that in stochastic media (i.e. media with large density fluctuations) neutrino flavors would depolarize [33,34]. Although recent solar neutrino experiments rule out such effects for the Sun [35], they may be important in supernovae.…”

Section: Implications Of Neutrino Mixing In Supernovaementioning

confidence: 99%