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Physics Event · · ·

Physics Colloquium: Ryan Keisler, University of Chicago

Date and Time: Wednesday, March 20, 2013 at 4:15 PM (CDT)
Location: RLM 4.102

Physics Colloquium

Ryan Keisler, Hubble Fellow, University of Chicago

Visiting Scholar, UT Austin, Texas Cosmology Center

"Cosmology with the South Pole Telescope"

4:15pm, RLM 4.102


I will describe a program of cosmological research centered on using measurements of the cosmic microwave background (CMB) to address questions relevant to physics: What is the absolute mass scale of neutrinos? How many species of neutrino-like particles were present in the early Universe? Did inflation occur, and, if so, at what energy scale?

A new generation of CMB experiments is targeting these questions, and I will focus on recent results from the South Pole Telescope (SPT).

The SPT is a ground-based mm-wave observatory located at the geographic south pole in Antarctica, and in 2011 finished its initial, 2500 square-degree survey.

The data from this survey provided an unprecedented combination of resolution, area, and sensitivity, and has been used to make ground-breaking measurements of the CMB anisotropy and the gravitational lensing of the CMB.

These measurements have, in conjunction with data from the WMAP satellite, led to strong constraints on models of inflation and on the the number of neutrino-like particle species present in the early universe.

In 2012, a new polarization-sensitive camera, SPT-POL, was installed on the SPT, and I will summarize its performance and prospects for detecting the "B-mode" CMB polarization pattern.

Finally, I will touch on what will be possible with a third-generation camera, SPT-3G. The leap in sensitivity provided by this camera will yield, for example, a constraint on the sum of the neutrino masses relevant for exploring the neutrino mass hierarchy.

September 18 11:00 RLM 11.204
Determining X-Ray Spectra of Radiographic Sources with a Compton Spectrometer
September 18 12:30 RLM 9.222
Members of the Theory Group discuss their work
September 18 12:30 RLM 11.204
Imaging and Spectroscopy of Graphene Heterostructures
September 18 14:00 RLM 13.202
Imaging Nanoscale Emergent Properties in Complex Oxides with Microwave Impedance Microscopy
September 19 16:00 RLM 5.104
Complex Nature of a 'Simple' Molecule
September 23 17:00 RLM 7.104
The Alice Experiment at the LHC -- A Little Big Bang!
September 24 16:15 The John A. Wheeler Lecture Hall (RLM 4.102)
The Question of Mass in Newton's Law of Gravity
September 25 12:30 RLM 11.204
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September 29 13:00 RLM 11.204
Rheology of suspensions and emulsions
September 30 09:00 RLM 13.202
Microwave Impedance Microscope Study of Two Dimensional Material Electrical Properties
September 30 17:00 RLM 7.104
Understanding the Higgs Boson with the Large Hadron Collider!
October 1 16:15 The John A. Wheeler Lecture Hall (RLM 4.102)
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October 1 16:15 The John A. Wheeler Lecture Hall (RLM 4.102)
title tbd
October 8 16:15 The John A. Wheeler Lecture Hall (RLM 4.102)
title tba