  A recent theory for the ordered phase of helical or chiral magnets such as
MnSi is used to calculate observable consequences of the helical Goldstone
modes or helimagnons. In systems with no quenched disorder, the helimagnon
contributions to the specific heat coefficient is shown to have a linear
temperature dependence, while the quasi-particle inelastic scattering rate is
anisotropic in momentum space and depends on the electronic dispersion
relation. For cubic lattices the generic temperature dependence is given by a
non-Fermi-liquid T^(3/2) behavior. The contribution to the temperature
dependence of the resistivity is shown to be T^(5/2) in a Boltzmann
approximation. The helimagnon thus leads to nonanalytic corrections to
Fermi-liquid behavior. Implications for experiments, and for transport theories
beyond the Boltzmann level, are discussed.
