Haruki Nishino

Status of the upcoming project for CMB observations from Chile: the
Simons Array experiment

The observations of Cosmic Microwave Background (CMB) have been
playing a key role for us to understand the beginning of our universe.
In recent years, at least for experimental cosmologists, the
polarization component of CMB is considered to be the next frontier
because the signature by the primordial gravitational waves from the
cosmic inflation is predicted to be imprinted as a curl-like pattern
called B-mode in the polarization pattern of CMB. The POLARBEAR
experiment is one of the experiments that have made significant
contributions to the understanding of the B-mode polarization of the
CMB. Some experiments including POLARBEAR has been confirming the
existence of the B-mode signal from the weak lensing effects of
large-scale structures. On the other hand side, the B-mode signal from
the primordial gravitational waves has not yet been detected. Several
experimental projects have been making efforts to achieve higher
sensitivities, and the upgrade of POLARBEAR, the Simons Array
experiment, is one of the world-leading upcoming CMB experiments in
the Atacama desert in Chile. Its first receiver system was developed
in KEK in Japan and deployed to Chile last year. The first telescope
achieved the "first-light" in the last austral summer. In this talk,
the results from the POLARBEAR experiment and the recent developments
from the Simons Array experiment are presented. 

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