Kavli Affiliate: Chao-Lin Kuo
| First 5 Authors: The BICEP/Keck Collaboration, :, P. A. R. Ade, Z. Ahmed, M. Amiri
| Summary:
The BICEP/$textit{Keck}$ (BK) series of cosmic microwave background (CMB)
polarization experiments has, over the past decade and a half, produced a
series of field-leading constraints on cosmic inflation via measurements of the
"B-mode" polarization of the CMB. Primordial B modes are directly tied to the
amplitude of primordial gravitational waves (PGW), their strength parameterized
by the tensor-to-scalar ratio, $r$, and thus the energy scale of inflation.
Having set the most sensitive constraints to-date on $r$, $sigma(r)=0.009$
($r_{0.05}<0.036, 95%$ C.L.) using data through the 2018 observing season
("BK18"), the BICEP/$textit{Keck}$ program has continued to improve its
dataset in the years since. We give a brief overview of the BK program and the
"BK18" result before discussing the program’s ongoing efforts, including the
deployment and performance of the $textit{Keck Array}$’s successor instrument,
BICEP Array, improvements to data processing and internal consistency testing,
new techniques such as delensing, and how those will ultimately serve to allow
BK reach $sigma(r) lesssim 0.003$ using data through the 2027 observing
season.
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