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Gago, A. M.; Santos, Edivaldo Moura; Teves, W.J.C.; Funchal, R. Zukanovich

doi:10.1103/physrevd.63.113013

Cited by 49 publications

(99 citation statements)

References 24 publications

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“…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]). The phenomenology of terrestrial neutrino experiments has also been investigated in [13,14]. More recently, prospective studies have focused on decoherence effects in high energy neutrinos [16,17,18,19,20], observable in next generation neutrino telescopes.…”

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%

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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%

Probing nonstandard decoherence effects with solar and KamLAND neutrinos

et al. 2007

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“…A linear decoherence simplified model, of Lindblad type [10] has been used for the fit, following earlier work in [30]. The model of [30] involved a diagonal decoherence matrix, and in the fit of [21] decoherence was assumed to be dominant only in the antineutrino sector, in order to fit the LSND results [31] pointing towards significant e !…”

Section: Introductionmentioning

confidence: 99%

“…The model of [30] involved a diagonal decoherence matrix, and in the fit of [21] decoherence was assumed to be dominant only in the antineutrino sector, in order to fit the LSND results [31] pointing towards significant e ! oscillations, but suppressed oscillations in the particle sector.…”

Section: Introductionmentioning

confidence: 99%

“…The first point concerns the complete positivity of the model. In [30] the diagonal form of the decoherence matrix, used in [21], was taken ad hoc, without explicit mention of the necessary conditions to guarantee complete positivity, as required by the Lindblad approach. Furthermore, the particular choice of the best fit of [21] did not lead to positive-definite probabilities for the entire regime of the parameter space of the model, although the probabilities were positive definite for the portion of the parameter space appropriate for the various neutrino experiments used for the fit.…”

Section: Introductionmentioning

confidence: 99%

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Quantum-gravity decoherence effects in neutrino oscillations: Expected constraints from CNGS and J-PARC

et al. 2008

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Quantum decoherence, the evolution of pure states into mixed states, may be a feature of quantumgravity models. In most cases, such models lead to fewer neutrinos of all active flavors being detected in a long-baseline experiment as compared to three-flavor standard neutrino oscillations. We discuss the potential of the CNGS and J-PARC beams in constraining models of quantum-gravity induced decoherence using neutrino oscillations as a probe. We use as much as possible model-independent parametrizations, even though they are motivated by specific microscopic models, for fits to the expected experimental data which yield bounds on quantum-gravity decoherence parameters.

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CPT Violation and Decoherence in Quantum Gravity

Mavromatos¹

Lecture Notes in Physics

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In these lectures I review, in as much pedagogical way as possible, various theoretical ideas and motivation for violation of CPT invariance in some models of Quantum Gravity, and discuss the relevant phenomenology. Since the subject is vast, I pay particular emphasis on the CPT Violating decoherence scenario for quantum gravity, due to space-time foam. In my opinion this seems to be the most likely scenario to be realised in Nature, should quantum gravity be responsible for the violation of this symmetry. In this context, I also discuss how the CPT Violating decoherence scenario can explain experimental "anomalies" in neutrino data, such as LSND results, in agreement with the rest of the presently available data, without enlarging the neutrino sector.

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Quest for the dynamics ofνμ→ντconversion

Cited by 49 publications

References 24 publications

Probing nonstandard decoherence effects with solar and KamLAND neutrinos

Probing nonstandard decoherence effects with solar and KamLAND neutrinos

Quantum-gravity decoherence effects in neutrino oscillations: Expected constraints from CNGS and J-PARC

CPT Violation and Decoherence in Quantum Gravity

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