The European Physical Journal C

, Volume 50, Issue 3, pp 635–646

A Planck-scale axion and SU(2) Yang–Mills dynamics: present acceleration and the fate of the photon

Regular Article - Theoretical Physics

DOI: 10.1140/epjc/s10052-007-0214-x

Cite this article as:
Giacosa, F. & Hofmann, R. Eur. Phys. J. C (2007) 50: 635. doi:10.1140/epjc/s10052-007-0214-x


From the time of CMB decoupling onwards we investigate cosmological evolution subject to a strongly interacting SU(2) gauge theory of Yang–Mills scale, Λ ∼ 10-4 eV (masquerading as the U(1)Y factor of the SM at present). The viability of this postulate is discussed in view of cosmological and (astro-) particle physics bounds. The gauge theory is coupled to a spatially homogeneous and ultralight (Planck-scale) axion field. As first pointed out by Frieman et al., such an axion is a viable candidate for quintessence, i.e. dynamical dark energy, being associated with today’s cosmological acceleration. A prediction of an upper limit for Δtmγ=0, the duration of the epoch stretching from the present to the point where the photon starts to be Meissner massive, is obtained: Δtmγ=0∼2.2 billion years.

Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  1. 1.Institut für Theoretische PhysikUniversität Frankfurt, Johann Wolfgang Goethe-UniversitätFrankfurtGermany