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SUMMARY:Quantum field-theoretic framework for neutrino decoherence
DTSTART;VALUE=DATE-TIME:20261030T073000Z
DTEND;VALUE=DATE-TIME:20261030T074500Z
DTSTAMP;VALUE=DATE-TIME:20261023T152906Z
UID:indico-contribution-6157@cern.ch
DESCRIPTION:Speakers: Konstantin Stankevich (Moscow State University)\nNeu
 trino oscillations probe quantum coherence over macroscopic distances and 
 are therefore sensitive to possible environmental and beyond-Standard-Mode
 l effects. While neutrino decoherence is often introduced phenomenological
 ly through Lindblad-type equations\, its microscopic origin requires a con
 sistent quantum field-theoretic treatment.\n\nWe present an open-system fr
 amework for neutrino propagation in which generalized master equations for
  the neutrino density matrix are derived from neutrino interactions with e
 xternal degrees of freedom. The formalism incorporates momentum-changing t
 ransitions and reproduces the standard Lindblad equation in suitable limit
 s. We consider three mechanisms of neutrino quantum decoherence: neutrino 
 decay\, elastic scattering in a medium\, and propagation in a fluctuating 
 classical axion-like-particle field. For neutrino decay\, the dissipative 
 terms are related to decay and inverse-decay widths\, allowing phenomenolo
 gical decoherence bounds to be translated into constraints on neutrino lif
 etimes. For elastic scattering\, the framework describes decoherence\, qua
 ntum-Zeno-like suppression of oscillations\, and possible effects of non-s
 tandard interactions or dark-sector particles. \n\nThe talk is based on ou
 r recent results\n\n[1] K.Stankevich\, A.Studenikin\, M.Vyalkov\, Quantum 
 field-theoretic framework for neutrino decoherence from scattering in a me
 dium\, Phys.Rev.D 114 (2026) 4.\n[2] A.Lichkunov\, K.Stankevich\, A.Studen
 ikin\, Neutrino quantum decoherence in a fluctuating ALPs field\, Phys.Rev
 .D 112 (2025) 12.\n[3] K.Stankevich\, A.Studenikin\, M.Vyalkov\, Generaliz
 ed Lindblad master equation for neutrino evolution\, Phys.Rev.D 111 (2025)
  3.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6157/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6157/
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