Possible effects of quantum mechanics violation induced by certain quantum-gravity effects on neutrino oscillations

Chang, Chao-Hsi; Dai, Wu-Sheng; Li, Xue–Qian; Liu, Yong; Ma, F.C.; Tao, Zhijian

doi:10.1103/physrevd.60.033006

Cited by 19 publications

(13 citation statements)

References 29 publications

(28 reference statements)

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“…Quantum gravity effects in neutrino systems have been investigated with increasing attention in the last decade, as a result of the evidence for neutrino flavor oscillations. Early attempts tried to interpret the solar neutrino puzzle [8,9,10] or the atmospheric ν anomaly [10] in terms of decoherence. After the first convincing evidence for atmospheric neutrino oscillations [15], a quantitative analysis was performed in [11], considering possible decoherence effects in the ν µ → ν µ channel (see also [12]).…”

Section: Introductionmentioning

confidence: 99%

“…However, lacking an "ab initio" theory of quantum gravity decoherence, its effects can only be parameterized in a model-dependent (and somewhat arbitrary) way. Searches with neutral kaon oscillations [3,4,5,6], neutron interferometry [3,7] and, more recently, neutrino oscillations [8,9,10,11,12,13,14], have found no evidence for such effects so far, and have placed bounds on model parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Early attempts tried to interpret the solar neutrino puzzle [8,9,10] or the atmospheric ν anomaly [10] in terms of decoherence. After the first convincing evidence for atmospheric neutrino oscillations [15], a quantitative analysis was performed in [11], considering possible decoherence effects in the ν µ → ν µ channel (see also [12]).…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probing nonstandard decoherence effects with solar and KamLAND neutrinos

et al. 2007

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“…Neutrinos travelling over very long baselines, such as from supernovae would be expected to experience this phenomenon. New physics beyond the Standard Model is required for this effect to be observable over small distances, such as quantum gravity in the context of black hole thermodynamics [14].…”

Section: Neutrino Decoherencementioning

confidence: 99%

Measuring $\nu_\mu$ Disappearance with the MINOS Experiment

Mitchell

2011

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The MINOS Experiment consists of two steel-scintillator calorimeters, sampling the long baseline NuMI muon neutrino beam. It was designed to make a precise measurement of the 'atmospheric' neutrino mixing parameters, ∆m 2 atm. and sin 2 (2θ atm.). The Near Detector measures the initial spectrum of the neutrino beam 1 km from the production target, and the Far Detector, at a distance of 735 km, measures the impact of oscillations in the neutrino energy spectrum. Work performed to validate the quality of the data collected by the Near Detector is presented as part of this thesis. Declaration This dissertation is the result of my own work, except where explicit reference is made to the work of others, and has not been submitted for another qualification to this or any other university. This dissertation does not exceed the word limit for the respective Degree Committee.

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“…Gravitational induced neutrino-antineutrino oscillations have also been investigated [25,26]. Quantum gravity effects and the possible violation of the equivalence principle are studied in [27][28][29][30][31]. In previous work [32], neutrino lensing in the Schwarzschild geometry under the weak gravity limit has been studied where it was shown that, unlike in the flat spacetime neutrino, neutrino flavor transition probability in the weak gravity neutrino lensing contains the information about the absolute neutrino mass and their hierarchy.…”

Section: Introductionmentioning

confidence: 99%

Neutrino flavor oscillations in a rotating spacetime

Swami¹

2022

Preprint

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We study neutrino oscillations in a rotating spacetime under the weak gravity limit for the neutrino trajectories constrained in the equatorial plane. Using the asymptotic form of the Kerr metric, we show that the gravitational source's rotation non-trivially modifies the neutrino phase. Further, we find that the flavor transition probability deviates more prominently from the Schwarzschild spacetime results when neutrinos are produced and detected on the same side of the gravitational source, i.e., neutrino propagates only towards or away from the gravitational source. For the neutrino weak gravity lensing in the equatorial plane, we find that the effects of gravitational object spin on the neutrino phase are subdominant compared with the Schwarzschild spacetime neutrino phase. However, the rotational effect can be comparable with the gravitational mass effect in the neutrino lensing if the naked singularity condition that bounds the Kerr rotation is violated. Furthermore, we find that the neutrino phase for the non-radial neutrino emission depends on the relative angular momentum direction of the neutrino and the gravitational source. For an asymptotic observer, we find that the neutrino phase, in the leading orders of gravitational spin corrections, differs from the Schwarzschild spacetime due to the difference in the proper spatial distance of the neutrino trajectory that connects the neutrino source and the detector. In contrast, the higher-order terms, other than those arriving from the proper spatial distance, which lead to the deviation from the Schwarzschild spacetime neutrino phase, are significantly suppressed. Further, we discuss neutrino gravitational decoherence. We find that decoherence length is also sensitive to the relative direction of the neutrino angular momentum and the gravitational source rotation. Finally, we demonstrate results using numerical examples.

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Possible effects of quantum mechanics violation induced by certain quantum-gravity effects on neutrino oscillations

Cited by 19 publications

References 29 publications

Probing nonstandard decoherence effects with solar and KamLAND neutrinos

Probing nonstandard decoherence effects with solar and KamLAND neutrinos

Measuring $\nu_\mu$ Disappearance with the MINOS Experiment

Neutrino flavor oscillations in a rotating spacetime

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