Carousel透镜II：利用GIGA-Lens进行宇宙学约束
The Carousel Lens II: Cosmological Constraints with GIGA-Lens
AI总结：
利用Carousel透镜和GIGA-Lens流水线，研究通过多源平面集群透镜提供宇宙学约束，获得暗能量方程状态w和物质密度Ωm的约束，并探讨更高红移源对约束精度的提升潜力。
摘要：
暗物质和暗能量的性质是宇宙学中的核心问题。具有多个源平面的强引力透镜提供了对宇宙学的几何探测：不同红移处的偏折角比率仅取决于角直径距离，从而限制了物质密度Ωm和暗能量方程状态w。然而，这一技术的约束历来落后于CMB、Ia型超新星和BAO的约束。在本工作中，我们通过Carousel透镜，一个具有40多个扩展图像的集群级透镜，提供了新的宇宙学约束。其放松的核心和丰富的主暗物质后的扩展图像使其特别适合于宇宙学推断。使用GIGA-Lens流水线，我们构建了一个像素级的透镜模型，包括六个哈勃空间望远镜检测到的源和四个质量组件。从该模型中，我们获得了Carousel透镜单独的wCDM约束：Ωm=0.34±0.16（-0.13）和w=-1.31±0.35（-0.32），考虑了统计和系统误差。我们进一步预测，包括四个额外的已知高红移源（假设相似的分数误差），可将约束能力提高约80%，使精度接近CMB和Ia型超新星的精度。对于一个演化的暗能量模型（w0waCDM），Carousel透镜单独的约束与CMB相当，提供了与Ia型超新星和BAO相辅相成的独立探测。虽然目前系统误差主导，我们通过模拟量化了这些误差，我们的结果表明，放松的多源平面集群透镜可以提供具有竞争力的宇宙学约束。进一步的改进预计来自系统误差的减少以及纳入高红移源（已知和新）的高分辨率成像。
英文摘要：
The nature of dark matter and dark energy are among the central questions in cosmology. Strong gravitational lenses with multiple source planes provide a geometric probe of cosmology: the ratio of deflection angles at different redshifts depends only on angular-diameter distances, constraining the matter density $Ω_m$ and the dark energy equation of state $w$. However, constraints from this technique have historically lagged behind those from the CMB, SNe Ia, and BAO. In this work, we present new cosmological constraints from the Carousel Lens, a cluster-scale lens with more than 40 extended images from 11 spectroscopically confirmed sources. Its relaxed core and rich set of extended images behind the main halo make it particularly suitable for cosmological inference. Using the GIGA-Lens pipeline, we construct a pixel-level lens model including six HST-detected sources and four mass components. From this model, we obtain $w$CDM constraints of $Ω_m = 0.34^{+0.16}_{-0.13}$ and $w = -1.31^{+0.35}_{-0.32}$ from the Carousel Lens alone, accounting for both statistical and systematic uncertainties. We further project that including four additional known higher-redshift sources, assuming similar fractional uncertainties, could improve the constraining power by ~80%, bringing the precision close to that of the CMB and SNe Ia. For an evolving dark energy model ($w_0w_a$CDM), the Carousel Lens alone yields constraints comparable to the CMB, providing an independent and complementary probe alongside SN Ia and BAO. While currently systematic uncertainties dominate, which we quantify through simulations, our results demonstrate that relaxed multi-source-plane cluster lenses can deliver competitive cosmological constraints. Further improvements are expected from reductions in systematics and from incorporating higher-redshift sources (known and new) with high-resolution imaging.
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