论文标题
PULSAR时正时阵列限制在Spin-2 ULDM上
Pulsar timing array constraints on spin-2 ULDM
论文作者
论文摘要
超轻色暗物质（ULDM）模型是宇宙学暗物质的合适候选者，这些候选物可能会在许多可观察的物品中留下特征性的烙印。在其他探针中，可以在PULSAR计时数据中搜索ULDM的签名。在这项工作中，我们描述了Spin-2 ULDM对Pulsar定时阵列的影响，从而扩展了较低自旋的先前结果。 Spin-2 ULDM普遍耦合到标准物质，无量纲强度$α$。我们估计，当前数据可能会将此耦合限制在质量范围$ M \ Lessim4 \ times10^{ - 22} $ eV处，$ 10^{ - 5} $至$ 10^{ - 6} $级别，这是该质量范围内最竞争的约束。 Spin-2 ULDM对Pulsar时机效应的关键特征是其各向异性四极形状。此功能可以在区分Spin-2 ULDM与标量ULDM和PTA实验的系统学的效果方面发挥作用。
Ultra-light Dark Matter (ULDM) models are suitable candidates for the cosmological Dark Matter that may leave characteristic imprints in many observables. Among other probes, signatures of ULDM can be searched for in pulsar timing data. In this work we describe the effects of spin-2 ULDM on pulsar timing arrays, extending previous results on lower spins. Spin-2 ULDM is universally coupled to standard matter with dimensionless strength $α$. We estimate that current data could constrain this coupling in the mass range $m\lesssim4\times10^{-22}$ eV at the $10^{-5}$ to $10^{-6}$ level, which is the most competitive constraint in this mass range. A crucial feature of the spin-2 ULDM effect on pulsar timing is its anisotropic, quadrupolar shape. This feature can be instrumental in differentiating the effects sourced by spin-2 ULDM from, for instance, scalar ULDM, and the systematics of a PTA experiment.
