Calendar
2012
September-December
Wed, Dec 12 - Fri, Dec 14 |
Cosmological Radiative Transfer Comparison Project Workshop IV 3-day Cosmology Workshop: click link, above, for details |
January-May
Mon, May 14 - Tues, May 15 |
TCC NIRB Workshop Near Infrared Background and the Epoch of Reionization [abstract] |
Mon, May 7 - Tues, May 8 |
TCC Gamma-Ray Workshop Dark Matter Signatures in the Gamma-Ray Sky [abstract] hosts: Eiichiro Komatsu & Can Kilic, University of Texas at Austin |
Tue, May 1 |
TCC / Colloquium Constraining Cosmology through the Growth of Structure: New Results from the South Pole Telescope [abstract] |
Mon, Apr 23 |
TCC / Astro Theory Seminar New Probes of Weak Lensing [abstract] |
Wed, Apr 18 |
TCC / Cosmos Seminar Constraining Dark Matter [abstract] |
Wed, Mar 28 |
TCC / Cosmos Seminar Cosmic Infrared Background and New Cosmological Populations [abstract] Alexander "Sasha" Kashlinsky, NASA, Goddard Space Flight Center |
Mon, Mar 26 |
TCC / Cosmos Seminar Measuring the Large-Scale Flow of X-ray Luminous Clusters from WMAP Data [abstract] In standard cosmological paradigm, large-scale peculiar velocities arise from gravitational instability due to mass inhomogeneities seeded during inflationary expansion. On sufficiently large scales, > 100 Mpc, this leads to a robust prediction of the amplitude and coherence length of these velocities independently of cosmological parameters or evolution of the Universe. For clusters of galaxies, their peculiar velocities can be measured from the kinematic component of the Sunyaev-Zel'dovich (SZ) effect produced by Compton scattering of cosmic microwave background (CMB) photons off the hot intracluster gas. I will discuss results from new measurements of the large scale peculiar flows using a large X-ray cluster catalog and all-sky CMB maps from the WMAP satellite. The results cast doubt that the gravitational instability from the observed mass distribution is the sole - or even dominant - cause of the detected motions. Instead it appears that the flow extends across the observable Universe and may be indicative of the primeval preinflationary structure of space-time and its landscape. Alexander "Sasha" Kashlinsky, NASA, Goddard Space Flight Center |