Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-12-15
Eur.Phys.J.C50:635-646,2007
Physics
High Energy Physics
High Energy Physics - Theory
v3: consequences of an error in evolution equation for coupling rectified, only a minimal change in physics results, two refs.
Scientific paper
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 $\Lambda\sim 10^{-4}$ 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 ultra-light (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 $\Delta t_{m_\gamma=0}$ for the duration of the epoch stretching from the present to the point where the photon starts to be Meissner massive is obtained: $\Delta t_{m_\gamma=0}\sim 2.2$ billion years.
Giacosa Francesco
Hofmann Ralf
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