Speakers bureau talks list

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Proposed talks

Announced Date Venue Speaker Title/Topic Abstract Slides

Approved talks

Announced Date Venue Speaker Title/Topic Abstract Slides

Past talks

Announced Date Venue Speaker Title/Topic Abstract Slides
7 December 2019 AAS 223, Seattle Colin Bischoff The search for primordial gravitational waves with CMB polarization Observations of Cosmic Microwave Background B-mode polarization at large angular scales are a uniquely powerful method to search for primordial gravitational waves, such as those predicted by theories of inflation. A major milestone would be to either detect this signature of gravitational waves or else to set an upper limit on the tensor-to-scalar ratio, r < 0.001, which would rule out the most compelling models of large-field inflation. This goal will be met by Stage-3 experiments currently coming online, the CMB Stage-4 project planned for next decade, as well as new balloon-borne and satellite telescopes. Galactic foregrounds and gravitational lensing of E-mode polarization pose major challenges for these measurements, but are already being addressed by current projects. I will discuss the goals and common design features of experiments targeting the primordial gravitational wave signal, as well as forecasts developed for CMB Stage-4. Media:20190107_bischoff_aas.pdf
29 November - 1 December 2018 Novel Instrumentation for Fundamental Physics Workshop, Puerto Rico


Clarence Chang Update on the ongoing activities [[Media:]]

22-24 September 2018 International Symposium on Cosmology and Ali CMB Polarization Telescope, Shanghai


Peter Timbie CMB-S4 overview and a general discussion of detector development [[Media:]]

15-18 October 2018 CMB Foregrounds, Tenerife


Julian Borrill CMB-S4 overview [[Media:]]
4-9 November 2018 8th KIAS Workshop on Cosmology and Structure Formation


Francois Bouchet CMB-S4 overview [[Media:]]

Recontres Du Vietnam Raphael Flauger Plenary talk, including CMB-S4 [[Media:]]
14-21 July, 2018 COSPAR, Pasadena John Carlstrom The Next Generation Ground-Based Cosmic Microwave Background Experiment, CMB-S4

Measurements of the CMB have driven our understanding of the universe and the physics that govern its evolution from primordial quantum fluctuations to its present state. They provide the foundation for the remarkable 6-parameter cosmological model, ΛCDM, which fits all cosmological data, although there are some tensions that may possibly hint at new physics. Far from being the last word in cosmology, the model raises deep questions: Is Inflation correct? What is its energy scale? What is the dark matter? What is the nature of dark energy? Are there light sterile neutrinos, or other light relics? This talk will describe progress on the next generation ground-based CMB experiment, CMB-S4, that is being designed to have sufficient sensitivity and control of systematics to make breakthroughs in many of these areas, i.e., to cross critical thresholds in parameter values or show that ΛCDM is incomplete.


4-11 July 2018 ICHEP 2018, Seoul Masashi Hazumi Plenary talk on CMB cosmology Media:myslides.pdf

1 Jun 2018 1-7 July 2018 Marcel Grossman Meeting Carlo Baccigalupi The Status of the CMB Stage IV Experiment Abstract: The 'Stage-4' ground-based cosmic microwave background (CMB) experiment, CMB-S4, consists of dedicated telescopes equipped with highly sensitive superconducting cameras operating at the South Pole, the high Chilean Atacama plateau, and possibly northern hemisphere sites. CMB-S4 will be designed to cross critical thresholds in testing inflation, determining the number and masses of the neutrinos, constraining possible new light relic particles, providing precise constraints on the nature of dark energy, and testing general relativity on large scales. In this contribution, we review the status of the project. Media:Carlo_Baccigalupi_S4_MGM15.pdf


19 Jun 2018 POLAR2018 John Carlstrom Status and Future of Cosmic Microwave Background Measurements from Antarctica Media:E1-2-0023-18-Carlstrom-Posted.pdf

17-22 June 2018 Workshop: WHIM and Cluster Outskirts: Lost and Found Baryons in the Local Universe, UA-Huntsville Jim Bartlett Gas Feedback Media:myslides.pdf

25 May 2018 04-08 Jun 2018 PASCO, Case Western John Ruhl Plenary talk on CMB-S4 Media:ruhl_pascos_final.pdf


15 April 2018 AAS Brad Benson CMB-S4 excerpt from "The Hubble Constant from the Cosmic Microwave Background" media:2018_04_15_Benson_CMB_Hubble_CMBS4_slides.pdf

17-24 March 2018 Rencontres de Moriond: Cosmology Victor Buza CMB-S4 Performance-Based Constraints On Primordial Gravitational Waves

The next-generation ground-based cosmic microwave background experiment, CMB-S4, will achieve new thresholds in the search for the B-mode polarization signature of primordial gravitational waves. To quantify these thresholds, as well as to propose an informed experimental configuration that will reach them, the CMB-S4 forecasting working group has developed a Fisher forecasting machinery targeted towards optimizing tensor-to-scalar parameter constraints in the presence of galactic foregrounds and gravitational lensing of the CMB. In this talk I will describe this framework and explain the uniqueness of this particular approach in basing the forecasts on scalings from actual analyses and multi-year achieved performances of the currently deployed BICEP/Keck series of experiments. In addition, I will detail our work on developing map-level noise simulations, and using various sky models, models of instrumental systematics, and analysis methods to explore the robustness of our findings, which most recently appeared in the CMB-S4 CDT report. Finally, I will talk about employing the Fisher framework in tandem with the simulations work to arrive at the currently proposed CMB-S4 strawman configuration.


22 Jan 2018 18-23 March 2018 Snowcluster Nick Battaglia On Cluster Profiles with CMB-S4

The next generation cosmic microwave background (CMB) experiment, CMB-S4, will make unprecedented measurements of secondary anisotropies in the CMB. I will focus on observations of the thermal and kinetic Sunyaev-Zel’dovich (SZ) effects, which will provide new windows into the thermodynamic properties of galaxy groups and clusters. I will show how we can constrain important baryonic processes, like feedback, that govern group and cluster formation through the high fidelity SZ profile measurements from CMB-S4. Additionally, I will describe the prospects to constrain fundamental physics from SZ observations and how to mitigate the modeling uncertainties associated with the baryonic processes that currently limit these constraints.


31 Jan 2018 CMB in Germany John Carlstrom CMB-S4 update [[Media:]]
2 Aug 2017 NRAO Futures 2017 Zeesh Ahmed File:AhmedFutures2017CMB-S4.pdf
6 Jan 2017 B modes from space workshop Lloyd Knox CMB-S4 update [[Media:]]

2 Mar 2017 SLAC Colloquium Suzanne Staggs Update following Feb 2017 CMB-S4 meeting File:CMB-and-S4-Staggs-SLAC-20170302-final.pptx
5 Aug 2016 NRAO Futures 2016 Zeesh Ahmed File:AhmedFuturesCMBsummary.pdf
July 2016 ICHEP 2016 Jeff McMahon media:McMahon_ICHEP2016.pdf

28 Jan 2016 Astronomy and Astrophysics Advisory Committee (AAAC) John Carlstrom CMB-S4 update File:CarlstromCMB-S4 AAAC 160128.pdf