Difference between revisions of "LBNL-2016: Simulations & Data Analysis"

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* Simulated/forecast data requirements timeline
* Data interfaces & formats
* Data interfaces & formats
* Computing resources & requirements
* Computing resources & requirements
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* Systematics representation/inclusion
* Forecasting requirements timeline
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* Computational efficiency (especially with next-generation HPC architectures)
* Computational efficiency (especially with next-generation HPC architectures)
* Usability
* Prioritization of systematic effects for simulation
* Prioritization of systematics simulation

Revision as of 13:57, 6 March 2016

Simulations & Data Analysis Parallel Session: Monday, March 7, 10:45 AM - 11:45 AM

Session Organizers: Tom Crawford & Julian Borrill

Chapter Section Coordinators:

  • Forecasting: Jo Dunkley & John Kovac
  • Sky Modeling: Nick Battaglia & Jacques Delabrouille
  • Time-Ordered Data Processing: Julian Borrill
  • Component Separation: Josquin Errard
  • Statistics & Parameters: Tom Crawford & Cora Dvorkin

Charge For This Session

What we are charged with achieving in this session is, according to the workshop wiki page (https://cosmo.uchicago.edu/CMB-S4workshops/index.php/LBNL-2016:_Cosmology_with_CMB-S4): "The goal for each of these sessions it to determine missing content and outstanding questions for their chapter. It is particularly important to address what they need from the larger community. During the Plenary session in the afternoon, the drafters will present their findings with emphasis on the issues for which community input is sought."

With that in mind, we ask that each section coordinator be prepared to discuss (briefly! we only have 10 minutes per section) the 1 or 2 questions that define the scope of your section, in particular questions that are still open after the writing of this draft of the chapter (and questions that require input from the larger meeting, so that we can bring those up in the plenary).

Please gather those questions---and any supporting figures or other material (but no big slide presentations, please)---in the sections below.

Rapid-fire Sessions (1 per chapter section)


  • Data interfaces & formats
  • Computing resources & requirements


  • Forecasting requirements timeline

Sky Modeling:

Galactic foregrounds

Secondaries and extragalactic foregrounds

  • The key challenges for the extragalactic sky models of CMB-S4 are to provide fast and self-consistent simulations of CMB secondary anisotropies and extragalactic sources.
  • Modular approach with many groups contributing.



  • What format? HEALPIX?
  • Reasonably well in hand exactly, but when do we need this by? Deadlines are always good...

Time-Ordered Data Processing:

  • Computational efficiency (especially with next-generation HPC architectures)
  • Prioritization of systematic effects for simulation

Component Separation:

  • Are our algorithms - validated against our model skies - sufficient for the real sky?

Statistics & Parameters:

Outstanding questions / What do we need from the community:

  • For Science Book writing:
  1. How to coordinate with the discussions of parameter-constraint-related issues in other sections (like de-lensing)?
  • For general planning (in no particular order)
  1. Covariance approximation sufficiency (Are there more covariance issues we haven't thought about? What about combining with optical?)
  2. At what stage do we combine data sets? (This may be treated in other sections too.)
  3. Do we have a plan for E/B separation? Will this be done the same way in every data set?
  4. What is the path toward more realistic de-lensing estimates?

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