Cosmological elves: small scale tests of the cold dark matter paradigm

宇宙精灵：冷暗物质范式的小规模测试

• 批准号: 203263-2009
• 负责人: Navarro, Julio
• 金额: $ 5.39万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=477037
• 关键词: Cosmological; elves; small; scale; tests

The completion of photometric and redshift surveys of large portions of the sky have revolutionized our understanding of faint galaxies, extending the category of dwarf galaxies to luminosities so faint that they blur the traditional distinction between galaxies and star clusters. At the same time, advances in computational cosmology have led to improved predictions of the properties of the smallest dark matter halos able to harbour luminous galaxies in the current paradigm of structure formation, the LCDM model. The confrontation of data with model predictions on these small objects holds the promise to validate or challenge the established paradigm on scales beyond those used to constrain its main parameters. The time is ripe for a concerted effort designed to assess the cosmological significance of Nature's smallest extragalactic objects. I propose to study this topic using a variety of observational and theoretical tools, from detailed N-body simulation of the formation of dark matter halos, to gasdynamical simulation of the formation of luminous dwarf galaxies, to direct observational efforts designed to survey the faintest galaxies in our Local Universe and to understand their impact on the formation of our Milky Way galaxy.

大部分天空的光度和红移调查的完成已经彻底改变了我们对微弱星系的理解，将矮星系的类别扩展到亮度，以至于它们变得如此微弱，以至于它们模糊了星系和星形簇之间的传统区别。同时，计算宇宙学的进步导致了对最小的暗物质光环的性能的改进，能够在当前结构形成范式（LCDM模型）中藏有发光星系。与这些小对象上的模型预测有关的数据对抗具有验证或质疑超越限制其主要参数的量表上已建立的范式的承诺。旨在评估大自然最小的乳外物体的宇宙学意义的一致努力的时间已经成熟。我建议使用各种观察和理论工具来研究此主题在我们当地的宇宙中，并了解它们对我们银河系的形成的影响。