论文标题
非规范域壁是暗能和暗物质的统一模型：I。宇宙动力学
Noncanonical Domain Wall as a Unified Model of Dark Energy and Dark Matter: I. Cosmic Dynamics
论文作者
论文摘要
我们提出了一个非规范域墙，作为一个受宏伟统一理论（肠）启发的新的黑暗能源模型。我们研究了宇宙动力学，并发现域壁在不同时间在不同时间充当暗能物质，具体取决于观察者的共同框架中的速度V。我们发现动态的单一稳定解决方案，即只有冻结（v = 0）非规范域壁可以进入幻影区，而无需体验幽灵场的不稳定性。这意味着该解具有状态（EOS）W_DW <-1的方程，而无需具有负动能。这些域壁从z = 0.8开始产生延迟宇宙加速度，导致w_dw = -1.5，而w_eff = -1.03今天。我们了解到，非规范域壁的EO与潜在形式无关。我们还研究了按照模型的扰动动力学。我们的模拟表明，与LCDM相比，非规范结构域壁模型中暗物质功率谱的幅度较低，而CMB功率谱则慢速转移到较低的L多物。与LCDM相比，提出的模型给出了较小的Sigma8。
We propose noncanonical domain walls as a new dark energy model inspired by grand unified theories (GUTs). We investigate the cosmic dynamics and discover that the domain walls act as either dark energy or dark matter at different times, depending on the velocity v in the observer's comoving frame. We find a single stable solution to the dynamics, i.e., only freezing (v = 0) noncanonical domain walls can enter the phantom zone without having to experience ghost field instability. This means that the solution has an equation of state (EoS) w_dw < -1 without having to possess negative kinetic energy. These domain walls give rise to a late-time cosmic acceleration starting from z = 0.8, resulting in w_dw = -1.5 and w_eff = -1.03 today. We learn that the EoS of the noncanonical domain walls is independent of the potential form. We also investigate the perturbation dynamics following the model. Our simulations show that compared to LCDM, the amplitude of the dark matter power spectrum in the noncanonical domain wall model is lower, while the CMB power spectrum is shifted slighly to lower l multipoles. The proposed model gives a smaller sigma8 compared to that of LCDM.
