Speaker:
Olivier Dore
Institution:
Jet Prop. Lab, Cal Tech
Speaker Link:
Date:
Thursday, May 7, 2015
Time:
3:30 pm
Location:
RH 101
*Refreshments to follow in Rowland Hall 142
ABSTRACT:
Planck is the third-generation satellite aimed at measuring the cosmic microwave background, the oldest electromagnetic radiation in the Universe, coming to us from just 400,000 years after the hot big bang. Launched in May 2009, Planck has surveyed the full sky at high sensitivity and high angular resolution from 30 to 857 GHz. This broad frequency coverage gives Planck a unique view of the history of the Universe from the epoch of recombination to the present. I will present the Planck latest cosmological results, with an emphasis on Planck's sensitivity to the low redshift Universe through, e.g., the lensing of the cosmic microwave background. I will also review how the multi-frequency observations of the Planck satellite instruments contain multiple probes of the reionization history of the Universe, either through the scattering of CMB photons or from the unresolved emission of star-forming galaxies. Finally, I will show how new cosmological insights will have to rely on ambitious low redshift large scale structure surveys and will use the proposed full-sky spectroscopic survey SPHEREx as an illustration.
Host:
Kevork Abazajian