The CMB in HD: the low-noise high-resolution frontier


The aim of this workshop is to explore the science gain of and instrumental paths forward for such an ultra-deep, high-resolution CMB survey.

162 5th Ave., Auditorium, 2nd floor

Please click the link below to join the webinar:

Or Telephone:

    Dial(for higher quality, dial a number based on your current location): 

        US: +1 646 558 8656  or +1 669 900 6833 

    Webinar ID: 721 292 894

    International numbers available:

    • 8:30 AM
    • Neelima Sehgal - Overview and motivation of workshop
    • Session 1: CMB Lensing and Dark Matter

      Moderator: Simone Ferraro

      Presentation materials (upload). 

      9:15am-9:25am - Francis-Yan Cyr-Racine - Probing the collective effect of the Universe's small-scale structure with gravitational lensing

      9:30am-9:40am - Alex Lague‚ - Non-Linear Fuzzy Dark Matter Modelling with Extended Lagrangian Perturbation Theory

      9:45am-9:55am - Emmanuel Schaan - Reducing foregrounds in lensing with shear-only reconstruction and lensing bias from lensed foregrounds

      10:00am-10:30am - Lensing and dark matter discussion panel: Francis-Yan Cyr-Racine, Alex Lague‚, Emmanuel Schaan, Neelima Sehgal

      Guiding discussion questions:

      • Does astrophysics impact our ability to extract cosmology from small scale lensing regime?

      • What more numerical work needs to be done to distinguish between the effect of baryonic physics and alternatives to cold dark matter on the small-scale matter power spectrum?

      • To what degree do we need to worry about higher order lensing effects in the CMB in HD regime?

      • What typical assumptions about lensing break down on the scales being discussed? (Gaussian, curl-free, weak, etc.)

      • Can this be done with optical lensing?

    • 10:30 AM
      Coffee Break
    • Session 2: Existing and Proposed telescopes

      Moderator: Brad Johnson

      Presentation materials (upload). 

      11:00am-11:10am- Charles Romero - GBT+MUSTANG-2 capabilities and outlook

      11:15am-11:25am - David Frayer - GBT Capabilities and Performance at High Frequency

      11:30am-11:40am - Tony Mroczkowski - Instrumentation for AtLAST

      11:45am-11:55am - Asantha Cooray - Origins Space Telescope survey science program

      12:00pm-12:30pm - Instrument discussion panel: Charles Romero, David Frayer, Tony Mroczkowski, Asantha Cooray, Simon Dicker

      Guiding discussion questions:

      • What is the maximum field of view and number of detectors that we can achieve with modest repurposing of the GBT?

      • What are the CMB specs of AtLAST and can it realistically achieve CMB in HD science?

      • How many years does it take for AtLAST to achieve 0.1uk-arcmin over 4000 sq deg, assuming 20% observing efficiency?  What NET and number of detectors does that assume?

      • What wavelengths are the highest priority for the 1st generation AtLAST instrumentation?

      • Would fewer spatial elements but better spectral resolution have any advantages? (e.g. mm-wave BAO and RSD, kSZ, & rSZ at the expense of CMB sensitivity)

      • What is the main science from the Origins Space Telescope, and how can it complement CMB in HD?  

    • 12:30 PM
    • Session 3: CMB Lensing - 1

      Moderator: Alexander van Engelen

      Presentation materials (upload). 

      2:00pm-2:10pm - Simone Ferraro - Analytical approach to lensing on small scales

      2:15pm-2:25pm - Victor Chan - A map-based estimator for CMB lensing at small angular scales (l>3000) using local statistics

      2:30pm-2:40pm - Blake Sherwin - New methods for small-scale CMB lensing reconstruction

      2:45pm-2:55pm - Srinivasan Raghunathan - Cluster lensing of the CMB

      3:00pm-3:10pm - Dominic Beck - Post-Born effects in CMB lensing

      3:15pm-3:25pm - Pavel Motloch - On lensing-induced covariances

      3:30pm-4:00pm - CMB Lensing-1 discussion panel: Simone Ferraro, Victor Chan, Blake Sherwin, Srinivasan Raghunathan, Dominic Beck, Pavel Motloch  

      Guiding discussion questions:

      • What is the main challenge to high-res CMB lensing measurements? Foreground cleaning?

      • What are the computational requirements, influence of biases / foregrounds, and optimality of various small scale lensing reconstruction techniques?

      • Could machine learning/deep learning play a useful role in small-scale lensing reconstruction?

    • 4:00 PM
      Coffee Break
    • Session 4: New technology

      Moderator: Charles Romero

      Presentation materials (upload). 

      4:30pm-4:40pm - Simon Dicker - Optics possibilities of a new CMB telescope

      4:45pm-4:55pm - Johannes Hubmayr - Cryogenic focal-planes for CMB observations

      5:00pm-5:10pm - Brad Johnson - MKIDs for ultra-deep high-resolution surveys

      5:15pm-6:00pm - New technology discussion panel: Simon Dicker, Johannes Hubmayr, Brad Johnson

      Guiding discussion questions:

      • Will MKIDS be ready to use as mainstream detector technology in the near future?

      • What are the main instrumental challenges to achieving CMB in HD observations?



    • 1
      cont min
    • 8:30 AM
    • Session 5: Planetary studies

      Moderator: Daan Meerburg  

      Presentation materials (upload). 

      9:00am-9:10am - Gil Holder - Overview of using the CMB for planets and asteroids

      9:15am-9:25am - Eric Baxter - Exo-Oort clouds

      9:30am-9:40am - Bhuvnesh Jain - Planetary studies with CMB and optical surveys

      9:45am-10:30am - Planetary studies discussion panel: Eric Baxter, Bhuvnesh Jain, Gil Holder

      Guiding discussion questions:

      • How are CMB planetary studies complementary with observations at other wavelengths?

      • What considerations should be given to survey design, scan strategy, and data storage to ensure that planetary science is possible with a CMB survey?

      • What experimental parameter(s) would need to be adjusted to maximize return for planetary science?

    • 10:30 AM
      Coffee Break
    • Session 6: Realistic instrumentation paths towards CMB in HD observations

      Moderator: Tom Crawford

      Presentation materials (upload). 

      11:00am-12:30am - Discussion panel: David Frayer, Tony Mroczkowski, Simon Dicker, Johannes Hubmayr, Sara Simon, Pete Barry

      Discussion questions:

      • Is there a viable instrumental path to achieving CMB in HD observations?

      • If so, can it involve repurposing existing telescopes or is a new instrument required?


    • 12:30 PM
    • Session 7: Science from SZ - 1

      Moderator: Colin Hill

      Presentation materials (upload).  

      2:00pm-2:10pm - Kendrick Smith - Cosmology from KSZ

      2:15pm-2:25pm - Kaustuv Basu -  High Resolution and High Frequency Frontiers in kSZ+rSZ Science

      2:30pm-2:40pm - Mathew Madhavacheril - High resolution kSZ

      2:45pm-2:55pm - Nicholas Battaglia - SZ

      3:00pm-3:10pm - James G. Bartlett - Probing the CGM and halo masses with high-definition CMB

      3:15pm-4:00pm - SZ-1 discussion panel: Kendrick Smith, Kaustuv Basu, Mathew Madhavacheril, Nicholas Battaglia, James G. Bartlett

      Guiding discussion questions:

      • What are the key design factors to optimize SZ science with a CMB survey?

      • What are the theoretical or observational hurdles to using SZ for precision cosmology?

      • How can X-ray observations, galaxy surveys, etc. help CMB SZ science and vice-versa?


    • 4:00 PM
      Coffee Break
    • Session 8: Astro2020 Decadal

      Moderator: Joel Meyers

      Presentation materials (upload). 

      4:30pm-6:00pm - Discussion panel: Tony Mroczkowski, Kaustuv Basu, James Bartlett, David Spergel, Bhuvnesh Jain, Kev Abazajian

      Discussion questions:

      • What additional CMB science white papers should be written for the Astro2020 Decadal?

      • Is AtLAST ready for the Astro2020 Decadal?

      • How will international partners (ESO, Japan) view the Astro2020 Decadal results?

      • What other things should we know or be paying attention to regarding the Astro2020 Decadal?


      Link to CMB in HD Science White Paper:


    • 8:30 AM
    • Session 9: Additional New Science Opportunities

      Moderator: Tristan Smith

      Presentation materials (upload). 

      9:00am-9:10am - Simon Foreman - Cosmic variance mitigation in measurements of the integrated Sachs-Wolfe effect

      9:15am-9:25am - Selim Hotinli - The moving lens effect

      9:30am-9:40am - Daan Meerburg - Non-Gaussianity

      9:45am-9:55am - David Spergel - Multiwavelength science

      10:00am-10:30am - New opportunities discussion panel: Simon Foreman, Selim Hotinli, Daan Meerburg, David Spergel, Francis-Yan Cyr-Racine

      Guiding discussion questions:

      • Are we just seeing the tip of the iceberg in terms of new science possibilities with CMB in HD?

      • What are additional avenues to consider exploring?

    • 10:30 AM
      Coffee Break
    • Session 10: CMB in the next decades

      Moderator: Neelima Sehgal

      Presentation materials (upload). 

      11:00am-12:30pm - Discussion panel:  Tom Crawford, Tony Mroczkowski, David Spergel, Gil Holder

      Discussion questions:

      • Are there compelling science targets that a proposed CMB-S4 LAT-type experiment (40% sky, 1uk-arcmin noise, 1 arcmin beam) can achieve that an AtLAST-type experiment (10% sky, 0.1uK-arcmin noise, 10 arcsec beam) cannot, given SO will exist?

      • Are the price tags of AtLAST (~250 million) and CMB-S4 (~500 million) comparing apples to apples?

      • Is there room for another major ground-based CMB experiment over the next 20 years?

    • 12:30 PM
    • Session 11: Science from SZ - 2

      Moderator: Kendrick Smith

      Presentation materials (upload). 

      2:00pm-2:10pm - Daisuke Nagai - Toward Cluster Outskirts and High-z

      2:15pm-2:25pm - Alexander van Engelen - Reconstructing polarized SZ

      2:30pm-2:40pm - Matthew Johnson - Fundamental physics with the Sunyaev Zel'dovich effect

      2:45pm-2:55pm - Moritz Munchmeyer - Sample variance cancellation with kSZ and lensing

      3:00pm-3:10pm - Theodore Macioce - Realistic Forecasts for Constraining Cosmology and Structure Formation with Kinetic Sunyaev-Zeldovich Effect Observations

      3:15pm-3:25pm - Luca Di Mascolo - Joint image-visibility studies of the SZ effect

      3:25pm - 3:30pm - Colin Hill - Constraining Galaxy Formation with Next-Generation CMB Experiments

      3:30pm-4:00pm - SZ-2 discussion panel: Daisuke Nagai, Alexander van Engelen, Matthew Johnson, Moritz Munchmeyer, Theodore Macioce, Luca Di Mascolo, Colin Hill

      Guiding discussion questions:

      • What work remains (theoretical, simulation, numerical, etc.) to realize these measurements with real data?

    • 4:00 PM
      Coffee Break
    • Session 12: Neutrino Physics

      Moderator: Simon Foreman

      Presentation materials (upload). 

      4:30pm-4:40pm - George M. Fuller - High precision neutrino decoupling calculations

      4:45pm-4:55pm - Evan Grohs - Neutrinos in BBN

      5:00pm-5:45pm - Neutrino physics discussion panel: Kev Abazajian, George M. Fuller, Evan Grohs, Joel Meyers

      Guiding discussion questions:

      • What are the new opportunities for neutrino physics presented by CMB in HD, as compared to say Simons Observatory?

      • Would CMB in HD observations be expected to help to break or circumvent optical depth degeneracy with neutrino mass?

      • Are m_nu, N_eff, and Y_p the most relevant neutrino physics related observables as we push to a new regime of observation?

      • How will constraints from Super-CHIME on Neff compare to CMB constraints?

      5:50pm-6:00pm - Joel Meyers - Summary of Workshop