#  ITC Pizza Lunch - John Kovac (Harvard)  

 



####  calendar\_today Date and Time 

 **April 26, 2017** 

 11:00AM - 12:00PM EDT 

####  pin\_drop Location 

 **Phillips**  



 

 



 

"The search for primordial gravitational waves, part 2 -- experimental perspective"

Abstract: The BICEP/Keck Array cosmic microwave background (CMB) polarization experiments located at the South Pole are a series of small-aperture refracting telescopes designed to probe the degree-scale B-mode signature of primordial gravitational waves. These highly-targeted experiments have produced the world's deepest maps of CMB polarization, leading to the most stringent constraints on the tensor-to-scalar ratio to date: r < 0.09 from B-modes alone, and r < 0.07 in combination with other datasets. These limits are rapidly improving with ongoing measurements at the multiple frequencies needed to separate Galactic foregrounds from the CMB, and in combination with higher-resolution experiments to remove B-modes induced by gravitational lensing. I will discuss the challenges that will be confronted as these measurements and planned "Stage 4" CMB efforts strive for sensitivity to primordial gravitational waves at levels r ~ 0.01 down to r < 0.001 in coming years.



 

 



 

 See also:- [ 2016-17 ](/academic-year/2016-17)
- [ Pizza Lunch ](/event-type/pizza-lunch)
 
 

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