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New Insight on Neutrino Dark Matter Interactions from Small-Scale CMB Observations

  报告题目:New Insight on Neutrino Dark Matter Interactions from Small-Scale CMB Observations

  报告人:Sebastian Trojanowski(National Centre for Nuclear Research/波兰国家核研究中心)

  报告摘要:In the talk, I will revisit the possibility of using cosmological observations to constrain models that involve interactions between neutrinos and dark matter. I will show that small-scale measurements of the cosmic microwave background with a few percent accuracy are critical to uncovering unique signatures from models with tiny couplings that would require a much higher sensitivity at lower multipoles, such as those probed by the Planck satellite. In order to test this, the high-multipole data released by the Atacama Cosmology Telescope have been analyzed, both independently and in combination with Planck and Baryon Acoustic Oscillation measurements, finding a preference for a non-vanishing coupling at 68% CL. This aligns with other CMB-independent probes, such as Lyman-α. I will illustrate how this coupling could be accounted for in dark matter interactions with a sterile neutrino.(arXiv: 2303.16895)

  报告时间:2023年12月7日(周四)14:00

  报告地点:仙林园区3-302室

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