| Searching for New Physics in the Universes Oldest Light with the Atacama Cosmology Telescope |
| Colin Hill, Columbia University & CCA |
 Event Type: Astro Seminar |
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| Time: 2:00 PM - 3:30 PM |
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| Location: Hybrid: Room 902 or Zoom |
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| Abstract: I will discuss recent and ongoing work focused on attempts to restore concordance amongst cosmological data sets, motivated by discrepancies amongst some measurements of the cosmic expansion rate H_0 and the matter clustering amplitude S_8. Particular attention will be paid to models invoking new physics at or prior to recombination, including quasi-accelerating early dark energy models and small-scale baryon-clumping scenarios e.g., due to primordial magnetic fields. In particular, I will discuss constraints on these models derived using the latest data from the Atacama Cosmology Telescope ACT. I will conclude with a look ahead to forthcoming CMB measurements from ACT, which will provide a powerful test of these models in the low-noise, high-resolution regime. Link to the Event Video |