  In Little Higgs models, the Higgs mass is stabilized at the one-loop level by
the mechanism of collective symmetry breaking. Typically, the basic ingredient
of these models is a large(r) global symmetry group spontaneously broken at a
scale of several TeV. The (light) Higgs appears as a Goldstone boson
corresponding to a non-diagonal broken generator of this global symmetry. There
could also be physical pseudoscalar particles present which belong to diagonal
generators, having the properties of axions with masses in the range from
several GeV up to the electroweak scale. We investigate the interesting
phenomenology of these pseudo-axions at the linear collider as well as the
photon collider.
