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We propose noncanonical domain walls as a new dark energy model inspired bygrand unified theories (GUTs). We investigate the cosmic dynamics and discoverthat the domain walls act as either dark energy or dark matter at differenttimes, depending on the velocity v in the observer's comoving frame. We find asingle stable solution to the dynamics, i.e., only freezing (v = 0)noncanonical domain walls can enter the phantom zone without having toexperience ghost field instability. This means that the solution has anequation of state (EoS) w_dw < -1 without having to possess negative kineticenergy. These domain walls give rise to a late-time cosmic accelerationstarting from z = 0.8, resulting in w_dw = -1.5 and w_eff = -1.03 today. Welearn that the EoS of the noncanonical domain walls is independent of thepotential form. We also investigate the perturbation dynamics following themodel. Our simulations show that compared to LCDM, the amplitude of the darkmatter power spectrum in the noncanonical domain wall model is lower, while theCMB power spectrum is shifted slighly to lower l multipoles. The proposed modelgives a smaller sigma8 compared to that of LCDM.

Noncanonical Domain Wall as a Unified Model of Dark Energy and Dark Matter: I. Cosmic Dynamics