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SUMMARY:Do we understand cosmic structure growth? Insights from new CMB le
 nsing measurements with the Atacama Cosmology Telescope - Blake Sherwin (D
 AMTP)
DTSTART:20240625T103000Z
DTEND:20240625T113000Z
UID:TALK216427@talks.cam.ac.uk
CONTACT:Steven Brereton
DESCRIPTION:One of the most powerful tests of our cosmological model is to
  verify the predicted growth of large-scale structure with time. Intriguin
 gly\, many recent measurements have reported small discrepancies in such t
 ests of structure growth ("the S8 tension")\, which could hint at systemat
 ic errors or even new physics. Motivated by this puzzling situation\, I wi
 ll present new determinations of cosmic structure growth using CMB gravita
 tional lensing measurements from the Atacama Cosmology Telescope (ACT). Th
 ese ACT DR6 CMB lensing measurements allow us to directly map the dark mat
 ter distribution in projection out to high redshifts\; new cross-correlati
 ons of CMB lensing with unWISE galaxies also allow us to probe the matter 
 tomographically. I will discuss the implications of our lensing results fo
 r the validity of our standard cosmological model as well as for key cosmo
 logical parameters such as the neutrino mass and Hubble constant.
LOCATION:Hoyle Lecture Theatre and online (details to be sent by e-mail)
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