Neutrino masses from large extra dimensions

Nima Arkani-Hamed, Savas Dimopoulos, Gia Dvali, John March-Russell

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    Abstract

    Recently it was proposed that the standard model (SM) degrees of freedom reside on a (3 + 1)-dimensional wall or "3-brane" embedded in a higher-dimensional spacetime. Furthermore, in this picture it is possible for the fundamental Planck mass M * to be as small as the weak scale M *≃ O (TeV) and the observed weakness of gravity at long distances is due the existence of new submillimter spatial dimensions. We show that in this picture it is natural to expect neutrino masses to occur in the 10 -1-10 -4 eV range, despite the lack of any fundamental scale higher than M*. Such suppressed neutrino masses are not the result of a seesaw, but have intrinsically higher-dimensional explanations. We explore two possibilities. The first mechanism identifies any massless bulk fermions as right-handed neutrinos. These give naturally small Dirac masses for the same reason that gravity is weak at long distances in this framework. The second mechanism takes advantage of the large infrared desert: the space in the extra dimensions. Here, small Majorana neutrino masses are generated by a breaking lepton number on distant branes.

    Original languageEnglish (US)
    Article number024032
    JournalPhysical Review D
    Volume65
    Issue number2
    DOIs
    StatePublished - Dec 1 2002

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    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)

    Cite this

    Arkani-Hamed, N., Dimopoulos, S., Dvali, G., & March-Russell, J. (2002). Neutrino masses from large extra dimensions. Physical Review D, 65(2), [024032]. https://doi.org/10.1103/PhysRevD.65.024032