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

Dec 12, 2018, 8:00 AM → Dec 14, 2018, 6:00 PM America/New_York

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: 

https://simonsfoundation.zoom.us/j/721292894

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: https://zoom.us/u/adSz0YmmEY

Wednesday, December 12

8:30 AM Breakfast

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 Lunch

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?

 

 

MINUTES

1 cont min

Thursday, December 13

8:30 AM Breakfast

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 Lunch

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:

https://www.overleaf.com/3845593215fkxfvkjgkjxh

 

Friday, December 14

8:30 AM Breakfast

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 Lunch

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