UMICH-2015: Dark Energy / Gravity / Dark Matter break-out session 3

From CMB-S4 wiki
Revision as of 13:55, 17 September 2015 by Cora (talk | contribs)
Jump to navigationJump to search

Wiki navigation

Return to main workshop page

Return to Dark Energy / Gravity / Dark Matter sessions page

Diffuse SZ effects / Mapping momentum

Key questions:

  • Which of those measurements is realistic? How to implement proper forecasts?
  • What parameters space should be explored?
  • How these probes compare to others (e.g. future galaxy surveys) in terms of constraints?

Some possible promising/interesting SZ topics:

  • kSZ pairwise statistics: promising with current data. It should be very powerful with CMB-S4.
  • kSZ via cross correlation with reconstructed velocity fields (see several papers from Shirley Ho, David Spergel and others). As above, it's already promising with current data, compelling in the future.
  • SZ polarization: offers another way to constrain clusters optical depths. Plus several other nice things: CMB quadrupole vs redshift for example. The signal is small (~0.1 uK at the center of very massive clusters) but stacking approaches might work.
  • SZ polarization from transverse motion of clusters: sensitive to the transverse component of the velocity field (hence, complementary to kSZ). Potentially very interesting but even smaller than the previous effect: suppressed by (v_t/c)^2. It should have a different frequency dependence though.

Dark Matter (lead by Cora Dvorkin):


  • How do forecasts on Dark Matter annihilation change when including foregrounds?
  • Can we do better on constraints on <sigmav>/m by adding prior information on As?
  • What other dark matter scenarios can we learn about from the CMB? (baryon/dark matter interactions, a complex dark sector, dark matter scattering with neutrinos, other models?)