PIRSA:24120019

CMB-HD as a Probe of Dark Matter on Sub-Galactic Scales

Sehgal, N. (2024). CMB-HD as a Probe of Dark Matter on Sub-Galactic Scales. Perimeter Institute. https://pirsa.org/24120019

Sehgal, Neelima. CMB-HD as a Probe of Dark Matter on Sub-Galactic Scales. Perimeter Institute, Dec. 17, 2024, https://pirsa.org/24120019 

          @misc{ pirsa_PIRSA:24120019,
            doi = {10.48660/24120019},
            url = {https://pirsa.org/24120019},
            author = {Sehgal, Neelima},
            keywords = {Cosmology},
            language = {en},
            title = {CMB-HD as a Probe of Dark Matter on Sub-Galactic Scales},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {dec},
            note = {PIRSA:24120019 see, \url{https://pirsa.org}}
          }

Neelima Sehgal

Stony Brook University

Talk number
PIRSA:24120019
Collection
Talk Type
Subject
Abstract

In this talk I will discuss the potential of future high-resolution CMB observations to probe structure on sub-galactic scales. In particular, I will discuss how a CMB-HD experiment can measure lensing over the range 0.005 h/Mpc < k < 55 h/Mpc, spanning four orders of magnitude, with a total lensing signal-to-noise ratio from the temperature, polarization, and lensing power spectra greater than 1900. These lensing measurements would allow CMB-HD to distinguish between cold dark matter (CDM) and non-CDM models that can resolve apparent small-scale tensions with CDM. In addition, CMB-HD can distinguish between baryonic feedback effects and non-CDM models due to the different way each impacts the lensing signal. The kinetic Sunyaev-Zel’dovich power spectrum measured by CMB-HD further constrains non-CDM models that deviate from CDM. In sum, future CMB experiments will not only measure traditional cosmological parameters with unprecedented precision, but will also simultaneously constrain baryonic physics and dark matter properties that impact sub-galactic scales.