We review some theoretical aspects of neutrino oscillations in the case where more than two neutrino flavors are involved. These include: approximate analytic solutions for 3-flavor (3f) oscillations in matter; matter effects in ν_μ \leftrightarrow ν_τ oscillations; 3f effects in oscillations of solar, atmospheric, reactor, and supernova neutrinos and in accelerator long-baseline experiments; CP and T violation in neutrino oscillations in the vacuum and in matter; the problem of U_e3; and 4f oscillations.

PACS: 11.30.Fs, 14.60.Pq, 26.65.+t (all) DOI: 10.1070/PU2004v047n02ABEH001692 URL: https://ufn.ru/en/articles/2004/2/b/ 000222400000002 2004PhyU...47..117A Citation: Akhmedov E Kh "Neutrino oscillations in three- and four-flavor schemes" Phys. Usp. 47 117–124 (2004) BibTexBibNote ® (generic)BibNote ® (RIS) MedlineRefWorks PT Journal Article TI Neutrino oscillations in three- and four-flavor schemes AU Akhmedov E Kh FAU Akhmedov EK DP 10 Feb, 2004 TA Phys. Usp. VI 47 IP 2 PG 117-124 RX 10.1070/PU2004v047n02ABEH001692 URL https://ufn.ru/en/articles/2004/2/b/ SO Phys. Usp. 2004 Feb 10;47(2):117-124 Оригинал: Ахмедов Е Х «Осцилляции в схемах с тремя и более типами нейтрино» УФН 174 121–130 (2004); DOI: 10.3367/UFNr.0174.200402b.0121