2000/02/11 by Cédric Deffayet, Cedric Deffayet, Jean-Philippe Uzan +1
Physics and Astronomy · #Axion #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Extra dimensions #Gravitation #Graviton #Massless particle #Mixing (physics) #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Quantum electrodynamics #Quantum mechanics #Theoretical physics #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevd.62.063507
published as Phys.Rev.D62:063507,2000 · 41 pages, LaTex, 6 figures
arxiv created 2000/02/11 · openalex publication_date 2000/08/04 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In the presence of a magnetic field, photons can mix with any particle having a two-photon vertex. In theories with large compact extra dimensions, there exists a hierachy of massive Kaluza--Klein gravitons that couple to any photon entering a magnetic field. We study this mixing and show that, in comparison with the four-dimensional situation where the photon couples only to the massless graviton, the oscillation effect may be enhanced due to the existence of a large number of Kaluza--Klein modes. We give the conditions for such an enhancement and then investigate the cosmological and astrophysical consequences of this phenomenon; we also discuss some laboratory experiments. Axions also couple to photons in the same way; we discuss the effect of the existence of bulk axions in universes with large extra dimensions. The results can also be applied to neutrino physics with extra dimensions.