Physics and Astronomy Colloquium
Cosmic Microwave Background Lensing: Fundamental Physics from Maps of the Invisible
Presented by Blake Sherwin, NASA Einstein Fellow, Lawrence Berkeley National Laboratory, Berkeley Center for Cosmological Physics / LBL Physics Division
Dark matter not only forms an invisible cosmic scaffolding within which galaxies form, its distribution in the universe also contains a wealth of information about neutrinos, inflation, and dark energy. Measurements of gravitational lensing in the cosmic microwave background (CMB) allow this matter distribution to be directly seen and mapped out to high redshifts. In my talk, I will discuss current and future work in this new but rapidly advancing field. In particular, I will show new measurements of CMB lensing with the ACTPol experiment and discuss the promise of future ultra-high-precision studies of the lensing signal with the CMB Stage-IV experiment. Lensing is not only a signal, however, but also a source of noise that limits how much we can learn about the early universe via B-mode polarization. In my talk, I will explain why delensing - removing the lensing effect to reveal the primordial sky - is crucial for the future of CMB science, showing recent work in this new area.
4:00 pm, Friday, January 20, 2017
Room 125, Dane Smith Hall
Southwest corner of Las Lomas and Yale, Albuquerque, New Mexico
Refreshments will not be available at this event, in the lobby of Dane Smith Hall.
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A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php