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，这还远远不能确定。这打开了一个迷人的发现窗口，让我们更多地了解引力和与宇宙加速膨胀有关的黑暗成分。在探索这些窗口的过程中，该项目将跨越广泛的物理系统和方法，从当前和即将到来的大量观测大尺度结构数据（重点是DES和LSST调查）中得出观测界限，到探索引力行为的理论高能物理约束。因此，作为这个项目的一部分，我们将在非常大的尺度上探索宇宙对暗能量和修正引力的限制，在那里物理是足够线性的，可以分析处理。例如，这将涉及理解、计算和结合来自宇宙微波背景的透镜和星系群集的新约束。我们将使用来自DES（暗能量调查）和许多互补的星系外宿主目录的当前数据来推导引力物理的最新边界，并预测下一代调查的类似约束，特别是LSST（时空遗产调查）。此外，我们将补充这些数据驱动的约束与理论见解和约束，这些约束使用传统的国内粒子物理技术，例如，考虑基本粒子（如引力子）散射的引力物理的新边界。将它们与直接从宇宙学中获得的边界结合起来，我们将能够获得定性的新见解，从而将注意力集中在宇宙引力的本质上。