Domain Wall Dominated Universes

We consider a cosmogony with a dark matter component consisting of a network of frustrated domain walls. Such a network provides a solid dark matter component with $p=-(2\mathrm{/}3)\rho$ that remains unclustered on small scales and with ${\mathrm{\Omega }}_{\mathrm{d}\mathrm{w}}\approx 0.7$ can reconcile a spatially flat universe with the many observations indicating ${\mathrm{\Omega }}_{\mathrm{m}}\approx \mathrm{0.3.}$ Because of its large negative pressure, this component can explain the recent observations indicating an accelerating universe without recourse to a non-vanishing cosmological constant. We explore the viability of this proposal and prospects for distinguishing it from other kinds of proposed dark matter with significant negative pressure.