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Extra Spacetime Dimensions and Unification

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arxiv hep-ph/9803466 v2 pith:KXN6B7C3 submitted 1998-03-26 hep-ph hep-th

Keith R. Dienes , Emilian Dudas , Tony Gherghetta This is my paper · ORCID
classification hep-phhep-th
keywords dimensionsextraspacetimecouplingsmassproton-decayscalestheories
verification ladder T0 review T1 audit T2 compute T3 formal

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We study the effects of extra spacetime dimensions at intermediate mass scales, as expected in string theories with large-radius compactifications, and focus on the gauge and Yukawa couplings within the Minimal Supersymmetric Standard Model. We find that extra spacetime dimensions naturally lead to the appearance of grand unified theories at scales substantially below the usual GUT scale. Furthermore, we show that extra spacetime dimensions provide a natural mechanism for explaining the fermion mass hierarchy by permitting the Yukawa couplings to receive power-law corrections. We also discuss how proton-decay constraints may be addressed in this scenario, and suggest that proton-decay amplitudes may be exactly cancelled to all orders in perturbation theory as a result of new Kaluza-Klein selection rules corresponding to the extra spacetime dimensions.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Asymptotic grand unification in SO(10) with one extra dimension

    hep-ph 2025-05 conditional novelty 7.0 of 10

    A 5D SO(10) model with a 10, 120, and 16 Higgs can make gauge couplings asymptotically safe and Yukawa couplings asymptotically free, but only with an exact matching condition at the compactification scale.

  2. Calling the Brane Next Door: The Kaluza-Klein Tower as a Gravitational Information Channel

    hep-th 2026-06 unverdicted novelty 6.0 of 10

    The Kaluza-Klein tower functions as a MIMO gravitational communication channel between branes, with modes acting as subchannels for encoding information via occupation, phases, and timing.

  3. String Theory and Grand Unification Suggest a Sub-Microelectronvolt QCD Axion

    hep-ph 2025-05 conditional novelty 6.0 of 10

    String-theoretic axions consistent with grand unification and proton decay are predicted to have masses in the 3e-11 to 1e-8 eV window, with at most 47 axions in the Kreuzer-Skarke ensemble.

  4. Belle II Constraints on the Non-Minimal Universal Extra Dimensional Model

    hep-ph 2025-09 unverdicted novelty 5.0 of 10

    Belle II data on the rare B decay constrains the non-minimal UED model to require the inverse compactification radius to be at least ~900 GeV, while the minimal version yields no bound.

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