Collaborative Research: Ground-based Investigations Relevant to the Joint Dark Energy Mission

联合暗能量任务（JDEM）最近通过美国国家航空航天局（NASA）和能源部（DOE）之间的合作协议创建，以探测和表征暗能量及其对宇宙膨胀历史的影响。由于地面工作将在未来十年影响我们对暗能量的理解，在JDEM启动之前，这些研究可以预期的约束应该在JDEM的需求定义阶段发挥明确的作用。本项目将探讨地面观测活动是否以及如何以任何方式影响JDEM的设计，或预测JDEM的任何部分结果。它将评估交叉校准是否足够精确，以避免在JDEM上需要光学探测器，地面设施可能需要哪些新仪器，以及来自太空的弱透镜调查是否会增加价值。美国宇航局、美国能源部和美国国家科学基金会都投入了大量资源来探测和表征暗能量，这些调查为机构间合作提供了绝佳的机会。尽管美国国家科学基金会不会，也不能直接参与JDEM本身，但科学问题影响着美国国家科学基金会支持的社区，而这个项目将有助于确定他们的角色。

AST-0413793SpergelThe Joint Dark Energy Mission (JDEM) has recently been created through a cooperative agreement between the National Aeronautics and Space Administration (NASA) and the Department of Energy (DOE) to detect and characterize dark energy and its influence on the cosmic expansion history. Since ground-based work will impact our understanding of dark energy during the next decade, prior to the launch of JDEM, the constraints which can be expected from such studies should play an explicit role in the requirements definition phase of JDEM. The present project will explore whether and how a ground-based observing campaign could in any way influence the design of, or anticipate any part of the results from, the JDEM. It will assess whether cross-calibration can be precise enough to obviate the need for optical detectors on JDEM, what new instrumentation might be necessary at ground-based facilities, and whether a weak lensing survey from space adds value.NASA, DOE, and NSF are all devoting significant resources toward detecting and characterizing dark energy, and these investigations provide an excellent opportunity for inter-agency cooperation. Although the NSF will not, and cannot, be involved directly in JDEM itself, the science questions affect the NSF-supported community, and this project will help to define their role.