Neutrino Mass WG Telecon
Call 2 - August 23
Agenda for call:
0) general charge
1) discussion of plan
3) volunteers for forecasting
Input for forecasts (will later have a link from Tom Crawford that will be maintained with up-to-date info):
As a starting point for forecasts, for the large aperture wide-field survey let's go with the numbers from the CDT (Table 1 from https://www.nsf.gov/mps/ast/aaac/cmb_s4/report/CMBS4_final_report_NL.pdf). For the small-area (r-focused) survey, things are not quite settled.
That means (via Tom Crawford and Matt Hasselfield): area of sky: 40% of the full sky frequencies: 40 90 150 220 270 map depths (T, in units of uK-arcmin): 5.6 1.35 1.81 9.1 17.1 [assumed detector effort in physical det-yrs]: 24268 349455 349455 124251 124251
For beams, baseline would be to assume a diffraction-limited 6m telescope. To be concrete, let's say a 1.4' beam at 150 GHz that then scales as (1/freq).
To include the effects of atmosphere and 1/f, the recommendation is to use the ell scaling at https://cmb-s4.org/CMB-S4workshops/index.php/Update_on_Neff_Forecasts. That means putting in a knee at ell=3400 in TT and at 340 in EE (and presumably BB):
NlTT= N0TT(1+ (l /3400)-4.7)
NlEE= N0EE(1+ (l /340)-4.7)
Neutrino Mass Analysis Working Group Plan Through December 2018
Outline of Science Chapter
To be modeled off of the Science Book chapter, with updates and some new ingredients
- Brief Intro
- CMB Lensing / forecasting
-Add updates with new noise levels
-What can we say about CMB lensing vs RSD, weak lensing, Lyman-alpha, cluster abundance?
-Add discussion of systematics and why the measurement should be robust
-Expand on tau limitation. What you actually need to know about foregrounds and noise given the tau limits. Options for improving tau?
-Discuss model independence with cross-correlations
-Discuss influence of priors on conclusions about hierarchy, mass scale
- Additional CMB - S4 probes
- Add cluster based forecasts, add cross-correlation based forecasts
- S4 constraints in context with lab experiments and neutrino model-building
-Include input from neutrino phenomenologists and experimentalists
-Potentially add: updates regarding Miniboone results? Updates regarding stronger hints of Normal Hierarchy or delta?
-Detection scenarios: expand on Section 3.5 and Table 3-2 in Science Book
-Discussion of how Mnu constraints inform model building
To-do before September Meeting:
-Preliminary forecasts on neutrino mass for each key observable
-Have conclusions in hand OR identify specific outstanding issues for what we can say about CMB lensing vs other methods
-Tau limitation and prospects for improvement
-Impact of priors
-Summary of content for context with lab experiments / model-building for comments
To-do by November:
-Draft of chapter available for circulation