Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session R4: Invited Session: Gravitational Lensing Applications of CMB Surveys |
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Sponsoring Units: DAP Chair: Lloyd Knox, University of California, Davis Room: Chatham Ballroom C |
Monday, April 7, 2014 10:45AM - 11:21AM |
R4.00001: CMB Lensing and the Hunt for Primordial B Modes Invited Speaker: Gilbert Holder The polarization of the cosmic microwave background carries essential information about both the earliest moments of the universe (inflation) and the recent universe (gravitational lensing). Measurements of CMB polarization sourced by gravitational radiation from the inflationary epoch will provide a direct measurement of the energy scale of inflation, while measurements of the gravitational lensing signature provide direct measurements of the amplitude of large scale clustering in the universe, a sensitive probe of neutrino masses with a precision of $\sim$0.1 eV. Both of these probes particularly use the spatial variations of polarization that are classified as ``B-modes,'' which have a characteristic curl pattern. Ongoing CMB experiments are now measuring the B-mode polarization signatures of gravitational lensing and searching for the B-mode signal from inflation. As a specific example, I'll talk about recent results from the South Pole Telescope, the first detection of B-mode CMB polarization from gravitational lensing. [Preview Abstract] |
Monday, April 7, 2014 11:21AM - 11:57AM |
R4.00002: CMB Lensing Cross Correlations Invited Speaker: Lindsey Bleem A new generation of experiments designed to conduct high-resolution, low-noise observations of the Cosmic Microwave Background (CMB) ---including ACTpol, \textit{Planck}, POLARBEAR and SPTpol--- are producing exquisite measurements of the gravitational lensing of the CMB. Such measurements, covering large fractions of the sky, provide detailed maps of the projected mass distribution extending to the surface of the CMB's last scattering. Concurrently, a large number of deep, wide-area imaging and spectroscopic surveys (e.g., the Dark Energy Survey (DES),\textit{WISE} all-sky survey, Subaru HyperSuprimeCam Survey, LSST, MS-DESI, BigBoss, etc.) are, or will soon be, providing maps of the distribution of galaxies in the Universe. Correlations of such tracer populations with lensing data allows new probes of where and how galaxies form in the dark matter skeleton of the Universe. Recent correlations of maps of galaxy and quasar densities with lensing convergence maps have produced significant measurements of galaxy bias. The near-term prospect for improvements in such measurements is notable as more precise lensing data from CMB polarization experiments will help to break cosmological and astrophysical parameter degeneracies. Work by the \textit{Planck}, SPT, and POLARBEAR collaborations has also focused on the correlation of the Cosmic Infrared Background (CIB) with CMB lensing convergence maps. This correlation is particularly strong as the redshifts of the CIB and CMB lensing kernel are well matched. Such correlations probe high-redshift structure, constraining models of star-formation and the characteristic mass scale for halos hosting CIB galaxies and have also been used to demonstrate the first detection of CMB B-mode polarization --- an important milestone in CMB observations. Finally, combining galaxy number density, cosmic shear and CMB lensing maps has the potential to provide valuable systematic tests for upcoming cosmological results from large optical surveys such as LSST. [Preview Abstract] |
Monday, April 7, 2014 11:57AM - 12:33PM |
R4.00003: CMB-discovered high-z lenses and ALMA as probes of dark matter substructure Invited Speaker: Neal Dalal |
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