Neutrino Oscillations in Gravitational Fields

Neutrino oscillations arise from the quantum-mechanical mixing of neutrino mass eigenstates and manifest as periodic transitions among different interaction flavours as particles propagate through space. In regions of strong gravity, such as near black holes, neutron stars or in the expanding universe, spacetime curvature modifies the phases accumulated by mass eigenstates and can induce novel effects beyond the conventional oscillation formula. The interplay of general relativity and quantum field theory in curved spacetime predicts shifts in oscillation wavelengths, alterations to coherence lengths and potential spin–flavour transitions driven by tidal gravitational gradients. These phenomena bear directly on the interpretation of neutrino signals from astrophysical sources, offering probes of compact-object environments and early-universe conditions. Theoretical models employ both perturbative and non-perturbative techniques to capture corrections arising from horizon effects, gravitational redshift and wave-packet separation. Empirical efforts focus on detecting imprints of gravitationally induced phase shifts in solar, atmospheric and supernova neutrino spectra. Understanding neutrino oscillations in gravitational fields thus not only refines fundamental physics at the intersection of gravity and quantum mechanics but also enhances the diagnostic power of neutrino astronomy and cosmology in mapping the structure and evolution of the universe.

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Neutrino Oscillations in Gravitational Fields publication trend

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Technical terms

Flavour Eigenstate: A neutrino state defined by its weak-interaction type (electron, muon or tau).

Mass Eigenstate: A neutrino state with a definite mass that propagates through spacetime.

Oscillation Probability: The likelihood of a neutrino changing from one flavour to another over a given distance.

Curved Spacetime: The geometric description of gravity in which mass and energy distort the metric, altering particle trajectories and phase accumulation.

Decoherence: The loss of quantum coherence among neutrino states due to interactions, gravitational gradients or wave-packet separation.

Coherence Length: The characteristic distance over which neutrino wave packets remain coherent and capable of producing observable interference.

Spin Oscillation: Transitions involving changes in the neutrino’s spin state, which may be induced by magnetic or gravitational fields.

References

1. Neutrinos in curved spacetime: Particle mixing and flavor oscillations. Physical Review D (2020).
2. Neutrino spin oscillations in external fields in curved spacetime. Physical Review D (2019).
3. Spin effects in neutrino gravitational scattering. Physical Review D (2020).
4. Neutrino decoherence in presence of strong gravitational fields. Physics Letters B (2020).
5. Black hole interference patterns in flavor oscillations. Physical Review D (2018).