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Axion-like Particles from String Compactifications

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arxiv 1309.6988 v1 pith:QTXS7WUB submitted 2013-09-26 hep-th hep-ph

Michele Cicoli This is my paper
classification hep-thhep-ph
keywords alpsstringaxion-likecompactificationsdarkparticlesastrophysicalaxion-photon
verification ladder T0 review T1 audit T2 compute T3 formal
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We review how axion-like particles (ALPs) naturally emerge in the low-energy effective field theory of string compactifications. We focus on the study of their mass spectrum and couplings, stressing that they depend on the mechanism used to fix the moduli. We present concrete examples where either open or closed string modes behave as QCD axions which do not overproduce cold dark matter. Relativistic ALPs can also be produced by the decay of the lightest modulus which drives reheating. These ALPs contribute to dark radiation and could be detected via axion-photon conversion in astrophysical magnetic fields.

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Forward citations

Cited by 6 Pith papers

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

  1. Darkly Charged ALPs

    hep-ph 2026-07 accept novelty 7.0 of 10

    Darkly charged ALPs (DALPs) forbid all d=5 ALP-SM operators and admit only two leading d=6 operators (Higgs portal and hypercharge portal), with distinct collider, cooling, and dark-matter phenomenology.

  2. Testing F-theory GUTs with the Axiverse

    hep-th 2026-06 unverdicted novelty 6.0 of 10

    In F-theory GUTs, non-universal ALPs induced by hypercharge flux satisfy g_aγ/m_a well below the QCD axion prediction when gauge couplings unify near the string scale.

  3. Counting axions with IAXO

    hep-ph 2026-06 unverdicted novelty 5.0 of 10

    Projections for IAXO in two-axion parameter space plus spectral analysis of flavor oscillations show where the experiment can discriminate multi-axion signals from single-axion ones, extending to N-axion cases.

  4. Long-lived sterile neutrinos from axionlike particles at the Super Tau-Charm Facility

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    STCF can reach |V_eN|^2 values one to two orders of magnitude below current bounds for heavy neutral leptons via displaced-vertex searches from ALP decays in D-meson production.

  5. Flavor phenomenology of light dark particles

    hep-ph 2026-06 unverdicted novelty 2.0 of 10

    Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.

  6. Axions and Axion-like particles: collider searches

    hep-ph 2025-08 accept

    A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.

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