Cosmological probes of gravity

宇宙引力探测器

• 批准号: 2903935
• 金额: --
• 依托单位: University of Portsmouth
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2903935
• 关键词: Cosmological; probes; gravity

While we know that General Relativity is an excellent description of gravitational interactions on solar system scales, at much larger (high energy physics) and much smaller (cosmology) energy scales this is far from certain. This opens up fascinating discovery windows to learn more about gravity and the dark components of the universe linked to its accelerated expansion. In exploring several of these windows, this project will span a wide range of physical systems and methods, from deriving observational bounds from the current and upcoming wealth of observational large scale structure data (with a focus on the DES and LSST surveys) to exploring theoretical high energy physicsconstraints on the behaviour of gravity. As part of this project, we will therefore explore cosmological constraints on dark energy and modified gravity on very large scales, where the physics is sufficiently linear to be analytically tractable. This will e.g. involve understanding, computing and combining novel constraints from the lensing and clustering of galaxies with those from the cosmic microwave background. We will use current data from DES (Dark Energy Survey) and a host of complementary extragalactic host catalogues to derive state-of-the-art bounds on gravitational physics and to forecast analogous constraints for the next generation of surveys, especially for LSST (Legacy Survey of Space and Time). Furthermore, we will complement these data-driven constraints with theoretical insights and constraints derived using techniques traditionally at home in particle physics, e.g. novel bounds on gravitational physics from considering the scattering of fundamental particles (such as gravitons). In combining them with bounds obtained directly from cosmology, we will be able to gain qualitatively new insights and thereby zero in on the nature of cosmological gravity.

虽然我们知道广义相对论很好地描述了太阳系尺度上的引力相互作用，但在更大的（高能物理）和更小的（宇宙学）能量尺度上，这还远非确定。这打开了令人着迷的发现窗口，让我们更多地了解重力以及宇宙中与其加速膨胀相关的黑暗成分。在探索其中的几个窗口时，该项目将跨越广泛的物理系统和方法，从从当前和即将到来的大量观测大规模结构数据（重点关注 DES 和 LSST 调查）中得出观测界限，到探索理论高能物理对重力行为的约束。因此，作为该项目的一部分，我们将在非常大的尺度上探索暗能量和修正引力的宇宙学约束，其中物理足够线性，可以进行分析处理。这将例如涉及理解、计算以及将来自星系透镜和聚类的新约束与来自宇宙微波背景的约束相结合。我们将使用来自 DES（暗能量勘测）的当前数据和大量补充的河外宿主目录来推导出引力物理的最先进界限，并预测下一代勘测的类似约束，特别是 LSST（传统）空间和时间的调查）。此外，我们将用理论见解和约束来补充这些数据驱动的约束，这些理论见解和约束是使用粒子物理学中传统的技术得出的，例如通过考虑基本粒子（例如引力子）的散射，引力物理学的新界限。将它们与直接从宇宙学获得的界限相结合，我们将能够获得定性的新见解，从而对宇宙引力的本质进行归零。