Extending the toolset for cosmological tests of gravity

扩展引力宇宙学测试的工具集

• 批准号: 578478-2022
• 负责人: Pogosian, LevonL
• 金额: $ 1.82万
• 依托单位: Simon Fraser University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762339
• 关键词: Extending; toolset; cosmological; tests; gravity

Gravity presents some of the hardest challenges to physicists. We do not know how to reconcile gravity with quantum physics, nor do we understand dark energy and dark matter. These puzzles motivate extensive studies of new theories of gravity, as well as ways of testing them using astronomical observations. Testing gravity is one of the main science drivers for the large-scale internationally funded cosmological surveys in which Canada plays a leading role. MGCAMB is a numerical code developed and maintained by the cosmology group at SFU that has become one of the standard tools for cosmological tests of gravity. The proposed collaboration will take advantage of the unique expertise of Profs Kazuya Koyama (Portsmouth) and Claudia de Rham (Imperial) to extend the capabilities of MGCAMB and help keep it as the go-to tool for the cosmological community, keeping Canada at the forefront of discovery in the field of testing gravity.Prof. Koyama is a global leader in nonlinear effects of modified gravity. Members of the SFU group will work with his group to add to MGCAMB the option of making predictions for cosmic structures on small distances, where most of the information resides. Prof. de Rham is the world leading expert on massive gravity, which is an important class of modified gravity theories that could explain the origin of cosmic acceleration. Working jointly with Profs de Rham and Koyama's groups, the SFU group will identify cosmological signatures of massive gravity and add the corresponding capabilities to MGCAMB.

引力给物理学家带来了一些最艰巨的挑战。我们不知道如何协调引力与量子物理学，也不了解暗能量和暗物质。这些谜题激发了对新引力理论的广泛研究，以及利用天文观测来测试它们的方法。测试重力是国际资助的大规模宇宙学调查的主要科学驱动力之一，加拿大在其中发挥了主导作用。 MGCAMB 是由 SFU 宇宙学小组开发和维护的数字代码，已成为引力宇宙学测试的标准工具之一。拟议的合作将利用 Kazuya Koyama 教授（朴茨茅斯）和 Claudia de Rham 教授（帝国理工学院）的独特专业知识来扩展 MGCAMB 的功能，并帮助其保持其作为宇宙学界首选工具的地位，使加拿大在重力测试领域处于发现的前沿。小山是修正重力非线性效应领域的全球领导者。 SFU 小组的成员将与他的小组合作，为 MGCAMB 添加对短距离宇宙结构进行预测的选项，大部分信息都存在于此。德拉姆教授是世界领先的大质量引力专家，大质量引力是一类重要的修正引力理论，可以解释宇宙加速的起源。 SFU 小组将与 de Rham 教授和 Koyama 的小组合作，识别大引力的宇宙学特征，并为 MGCAMB 添加相应的功能。