Fredagskollokvium: Measurements of the Degree-Scale B-mode Polarization of the Cosmic Microwave Background, Current Status and Future Prospects

Benjamin Racine, Harvard-Smithsonian Center for Astrophysics.

portrettbildet av en ung man med en rød skjorte

Dr. Benjamin Racine, Harvard-Smithsonian Center for Astrophysics. Photo: private.

Measurements of the Cosmic Microwave Background (CMB) have improved greatly our understanding of the Universe, and are one of the pillars of our modern cosmological model. While CMB intensity and polarization have been measured with high precision, the curl component of the polarization (B-mode) induced by primordial gravitational waves has eluded detection.

Many experiments have been designed to detect these degree-scale B-modes, and upper limits are improving year by year.

In this talk, I will review recent results, focusing mainly on the BICEP and Keck experiments, located at the South Pole, which have the deepest CMB polarization maps to date at 95, 150 and 220GHz. I will then briefly introduce upcoming experiments, focusing mainly on CMB-S4.

 

Himmel, stjerner, aurora, radioantenne, snø
Auroras and the Dark Sector Laboratory at South Pole where BICEP3 and the South Pole Telescope are located. Photo: Geoff Chen, SPT winter-over (2020).
Emneord: institute seminar, fredagskollokvium, Kosmologi, Kosmisk bakgrunnsstråling (CMB)
Publisert 30. mars 2021 14:08 - Sist endret 16. apr. 2021 10:51