Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session B4: Cosmic Microwave BackgroundInvited
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Sponsoring Units: DAP DPF Chair: Paul Shapiro, University of Texas Room: Ballroom C |
Saturday, April 16, 2016 10:45AM - 11:21AM |
B4.00001: Planck and the reionization of the universe Invited Speaker: Brendan Crill Planck is the third-generation satellite aimed at measuring the cosmic microwave background, a relic of the hot big bang. Planck's temperature and polarization maps of the millimeter-wave sky have constrained parameters of the standard lambda-CDM model of cosmology to incredible precision, and have provided constraints on inflation in the very early universe. Planck's all-sky survey of polarization in seven frequency bands can remove contamination from nearby Galactic emission and constrain the optical depth of the reionized Universe, giving insight into the properties of the earliest star formation. The final 2016 data release from Planck will include a refined optical depth measurement using the full sensitivity of both the High Frequency and Low Frequency instruments. I present the status of the reionization measurement and discuss future prospects for further measurements of the early Universe with the CMB from Planck and future space and suborbital platforms. [Preview Abstract] |
Saturday, April 16, 2016 11:21AM - 11:57AM |
B4.00002: CMB constraints on dark matter Invited Speaker: Celine Boehm Measurements of the CMB angular spectrum have been critical in establishing the validity of the LCDM model on large scales but these observations give very little information about the particle nature of the dark matter. In my talk, I'll show that one can actually constrain the DM microphysics using the measured CMB spectra and the next generation of large-scales surveys (e.g. DESI, LSST). [Preview Abstract] |
Saturday, April 16, 2016 11:57AM - 12:33PM |
B4.00003: Stage 4 Cosmic Microwave Background Experiment Invited Speaker: John Carlstrom Measurements of the CMB have driven our understanding of the universe and the physics that govern its evolution from quantum fluctuations to its present state. They provide the foundation for the remarkable 6-parameter cosmological model, $\Lambda$CDM, which fits all cosmological data, although there are some tensions which may hint at new physics, or simply unaccounted systematics. 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? There is still a lot to learn from the CMB measurements. We are searching for the unique B-mode polarization that would be induced on the CMB by inflationary gravitational waves. We are able to detect the impact of the neutrino background on the CMB, which can be used to provide precise constraints on the number and masses of the neutrinos. We are untangling the correlations in the CMB induced by gravitational lensing to make maps of all the mass in the universe. We are measuring the scattering of the CMB by ionized structures, the Sunyaev-Zel’dovich effects, to detect clusters of galaxies and soon to map the momentum of the universe in addition to its density. To realize the enormous potential of these CMB tools we need to greatly increase the sensitivity of CMB measurements. We can expect significant advances in the next few years as the ongoing experiments deploy of order 10,000 detectors (Stage III), but to achieve critical threshold crossing goals we need to go further. The CMB community is therefore planning CMB-S4, an ambitious next generation (Stage IV) ground-based program with order of 500,000 detectors with science goals that include detecting or ruling out large field inflationary models, determining the number and masses of the neutrinos, providing precision constraints on dark energy through its impact on structure formation, as well as searching for cracks in the $\Lambda$CDM model. [Preview Abstract] |
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