弦和密索型结对畴壁动力学的影响：对暗能量的启示
Impact of string and monopole-type junctions on domain wall dynamics: implications for dark energy
摘要：
我们调查的潜在作用的字符串和dielectole-type路口的挫折畴壁网络的特征速度，$v$，和网络的特征长度，$L$，使用速度依赖的一个尺度模型。我们发现，除了非常特殊的网络配置，$v^2 \lsim (HL)^2 \lsim (ρ_σ+ ρ_μ)/ρ_m$其中$H$是哈勃参数和$ρ_σ$，$ρ_μ$和$ρ_m$的平均密度的域壁，字符串和胆固醇型结。我们进一步表明，如果畴壁是提供一个显着的贡献的暗能量，而不产生非常大的CMB温度波动，那么，在目前的时间，网络必须有一个特征长度$ L_0 \lsim 10 Ω_{σ0}^{-2/3} {\rm kpc}$和特征速度$v_0 \lsim 10^{-5} Ω_{σ0}^{-2/3}$，其中$Ω_{σ0}=ρ_{σ0}/ρ_{c 0}$和$ρ_c$是临界密度。为了满足$Ω_{σ0} \sim 1$的这些约束，$ρ_{m 0}$必须比$ρ_{σ0}$大至少10个数量级，这与观测结果完全不一致。这一结果提供了非常强有力的额外支持的猜想，没有自然的挫折机制，这可能会导致一个显着的贡献域壁的暗能量预算，存在。
英文摘要：
We investigate the potential role of string and monopole-type junctions in the frustration of domain wall networks using a velocity-dependent one-scale model for the characteristic velocity, $v$, and the characteristic length, $L$, of the network. We show that, except for very special network configurations, $v^2 \lsim (HL)^2 \lsim (ρ_σ+ ρ_μ)/ρ_m$ where $H$ is the Hubble parameter and $ρ_σ$, $ρ_μ$ and $ρ_m$ are the average density of domain walls, strings and monopole-type junctions. We further show that if domain walls are to provide a significant contribution to the dark energy without generating exceedingly large CMB temperature fluctuations then, at the present time, the network must have a characteristic length $ L_0 \lsim 10 Ω_{σ0}^{-2/3} {\rm kpc}$ and a characteristic velocity $v_0 \lsim 10^{-5} Ω_{σ0}^{-2/3}$ where $Ω_{σ0}=ρ_{σ0}/ρ_{c 0}$ and $ρ_c$ is the critical density. In order to satisfy these constraints with $Ω_{σ0} \sim 1$, $ρ_{m 0}$ would have to be at least 10 orders of magnitude larger than $ρ_{σ0}$, which would be in complete disagreement with observations. This result provides very strong additional support for the conjecture that no natural frustration mechanism, which could lead to a significant contribution of domain walls to the dark energy budget, exists.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
