- Dec. 5, 2022, 2:00 pm US/Central
- DIR/ Curia II-WH2SW - Wilson Hall 2nd fl South West
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Speaker: Hongwan Liu
Institution/University: Princeton University
Title/Abstract: A Large New Physics Signal in the 21-cm Power Spectrum
The claimed detection of a strong 21-cm absorption by the EDGES collaboration in 2018 ignited the interest of particle physicists in 21-cm cosmology, and in dark matter (DM) models that allowed for the cooling of baryons through elastic scatterings with DM. Most of the attention thus far has been on the 21-cm global signal. In this work, we revisit a model where cooling is achieved through a small fraction of millicharged particles interacting with a cold DM bath.We show that this model can predict a 21-cm power spectrum that is almost 3 orders of magnitude larger than the most optimistic standard cosmology predictions. This smoking gun signature of new physics will be tested in the near future by experiments such as LOFAR and HERA.
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