  We investigate whether early and late time attractors for non-conformal
kinetic theories exist by computing the time-evolution of a large set of
moments of the one-particle distribution function. For this purpose we make use
of a previously obtained exact solution of the 0+1D boost-invariant massive
Boltzmann equation in relaxation time approximation. We extend prior attractor
studies of non-conformal systems by using a realistic mass- and
temperature-dependent relaxation time and explicitly computing the effect of
varying both the initial momentum-space anisotropy and initialization time on
the time evolution of a large set of integral moments. Our findings are
consistent with prior studies, which found that there is an attractor for the
scaled longitudinal pressure, but not for the shear and bulk viscous
corrections separately. We further present evidence that both late- and
early-time attractors exist for all moments of the one-particle distribution
function that contain greater than one power of the longitudinal momentum
squared.
