晚期转变相互作用减速暗能量：模型定义与基准一致性测试
Late-Transition Interacting Thawer Dark Energy: Model Definition and Benchmark Consistency Tests
AI总结：
提出晚期转变相互作用减速暗能量（LTIT）模型，通过标量场与冷暗物质共形耦合实现暗区相互作用，在保持早期校准的同时产生可观测的扰动特征。
摘要：
我们将晚期转变相互作用减速暗能量（LTIT）公式化为一种晚期激活、变耦合的耦合精质实现，其中正则标量场仅与冷暗物质共形耦合。该构造是一种非普适的暗区相互作用：重子和辐射保持最小耦合，而冷暗物质遵循共形相关的度规。这种结构将三个观测扇区联系到一个微观机制——复合前校准尺度、低红移膨胀历史和耦合增长响应。我们推导了精确的背景方程、精确的冷暗物质标度恒等式 $\rhoc(a)=\rho_{c0}a^{-3}C[\phi(a)]/C(\phi_0)$，以及适用于爱因斯坦-玻尔兹曼求解器的同步规范下的耦合冷暗物质-标量扰动方程。在代表性基准中，$\Omega_\phi(z_*)\sim10^{-9}$，$|\Delta r_d/r_d|\le3.82\times10^{-3}$，$\max_{0<z<3}|E/E_{\Lambda\mathrm{CDM}}-1|\le0.380\\%$，而准静态增长指标范围为 $0.725\\%$ 到 $5.94\\%$。因此，LTIT 展示了晚期激活如何能够保留早期校准扇区，同时产生扰动敏感特征，为相互作用的暗能量的玻尔兹曼级测试提供了具体目标。
英文摘要：
We formulate the late-transition interacting thawer (LTIT) as a late-activating, variable-coupling realization of coupled quintessence in which a canonical scalar field couples conformally only to cold dark matter. The construction is a non-universal dark-sector interaction: baryons and radiation remain minimally coupled, while CDM follows a conformally related metric. This structure ties three observational sectors to one microscopic mechanism--the pre-recombination calibration scale, the low-redshift expansion history, and the coupled growth response. We derive the exact background equations, the exact CDM scaling identity $\rhoc(a)=ρ_{c0}a^{-3}C[ϕ(a)]/C(ϕ_0)$, and the coupled CDM--scalar perturbation equations in synchronous gauge in a form suitable for Einstein--Boltzmann solvers. In the representative benchmarks, $Ω_ϕ(z_*)\sim10^{-9}$, $|Δr_d/r_d|\le3.82\times10^{-3}$, and $\max_{0<z<3}|E/E_{Λ\mathrm{CDM}}-1|\le0.380\%$, while the quasi-static growth indicator ranges from $0.725\%$ to $5.94\%$. LTIT therefore demonstrates how late activation can preserve the early calibration sector while producing a perturbation-sensitive signature, providing a concrete target for Boltzmann-level tests of interacting dark energy.
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。
