论文标题
使用星系跨力谱和双光谱的奇数多物测试宇宙学尺度上的等效原理
Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum
论文作者
论文摘要
一般相对论的基石之一是等效原理。但是，等效原理的有效性仅在标准物质字段的太阳系量表上建立。不能假定该结果对于主导宇宙学量表重力动态的非标准物质字段。在这里，我们展示了如何使用Galaxy Cross Power Spectrum和Bispectrum的奇数多物在宇宙学量表上测试等效原理。该测试利用了过去圆锥体的均衡一般相对论变形，利用了星系跨功率光谱和双光谱，并假设可以将星系视为由巴里子和冷暗物质制成的测试粒子。如果对等原理在重子和暗物质之间不存在，则该假设会导致非零星系 - 巴里子相对速度。我们表明，使用HI强度映射的跨功率/H $α$ Galaxy调查和H $α$ Galaxy调查的Bispectrum，相对速度可以限制为小于星系速度的28％。
One of the cornerstones of general relativity is the equivalence principle. However, the validity of the equivalence principle has only been established on solar system scales for standard matter fields; this result cannot be assumed to hold for the non-standard matter fields that dominate the gravitational dynamics on cosmological scales. Here we show how the equivalence principle may be tested on cosmological scales for non-standard matter fields using the odd multipoles of the galaxy cross-power spectrum and bispectrum. This test makes use of the imprint on the galaxy cross-power spectrum and bispectrum by the parity-violating general relativistic deformations of the past-light cone, and assumes that galaxies can be treated as test particles that are made of baryons and cold dark matter. This assumption leads to a non-zero galaxy-baryon relative velocity if the equivalence principle does not hold between baryons and dark matter. We show that the relative velocity can be constrained to be less than 28% of the galaxy velocity using the cross-power spectrum of the HI intensity mapping/H$α$ galaxy survey and the bispectrum of the H$α$ galaxy survey.
