Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session S15: Correlating Optical and CMB SurveysInvited
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Sponsoring Units: DAP Chair: Scott Dodelson, Fermi National Accelerator Laboratory Room: Washington 2 |
Monday, January 30, 2017 1:30PM - 2:06PM |
S15.00001: Understanding the large-scale structure from the cosmic microwave background: shear calibration with CMB lensing; gas physics from the kinematic Sunyaev-Zel'dovich effect. Invited Speaker: Emmanuel Schaan I will present two promising ways in which the cosmic microwave background (CMB) sheds light on critical uncertain physics and systematics of the large-scale structure. \textbf{Shear calibration with CMB lensing (arXiv:1607.01761): } Realizing the full potential of upcoming weak lensing surveys requires an exquisite understanding of the errors in galaxy shape estimation. In particular, such errors lead to a multiplicative bias in the shear, degenerate with the matter density parameter and the amplitude of fluctuations. Its redshift-evolution can hide the true evolution of the growth of structure, which probes dark energy and possible modifications to general relativity. I will show that CMB lensing from a stage 4 experiment (CMB S4) can self-calibrate the shear for an LSST-like optical lensing survey. This holds in the presence of photo-z errors and intrinsic alignment. \textbf{Evidence for the kinematic Sunyaev-Zel'dovich (kSZ) effect~(arXiv:1510.06442); cluster energetics:} Through the kSZ effect, the baryon momentum field is imprinted on the CMB. I will report significant evidence for the kSZ effect from ACTPol and peculiar velocities reconstructed from BOSS. I will present the prospects for constraining cluster gas profiles and energetics from the kSZ effect with SPT-3G, AdvACT and CMB S4. This will provide constraints on galaxy formation and feedback models. [Preview Abstract] |
Monday, January 30, 2017 2:06PM - 2:42PM |
S15.00002: Cross-Correlating DES and SPT Invited Speaker: Eric Baxter The Dark Energy Survey (DES) and the South Pole Telescope (SPT) provide a uniquely powerful combination of overlapping optical imaging and cosmic microwave background (CMB) data. Cross-correlations between DES and SPT are expected to arise from several physical effects, including gravitational lensing, the Sunyaev-Zel'dovich (SZ) effect, and the Integrated Sachs-Wolfe effect. The resultant correlations contain information not accessible to either experiment on its own. Measurement of these correlations offers several exciting possibilities, such as improved cosmological parameter constraints, improved understanding of systematics affecting the two experiments, and calibration of the masses of galaxy clusters at high redshift. In this talk I will summarize recent results obtained by cross-correlating early DES data with data from the SPT-SZ survey and will discuss prospects for future cross-correlation measurements with these two surveys. [Preview Abstract] |
Monday, January 30, 2017 2:42PM - 3:18PM |
S15.00003: The Kinetic Sunyaev-Zeldovich Effect Invited Speaker: Simone Ferraro The kinetic Sunyaev-Zel'dovich effect is a direct probe of the distribution and velocity of electrons on cosmological scales. Recent progress in Cosmic Microwave Background observations allow statistical detections of this subtle effect originating from a number of different tracers populations as well as from the epoch of reionization. In my talk, I will review the observational status, highlight the consequences for astrophysics and cosmology and discuss future directions. [Preview Abstract] |
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