# ICHEP 2016 Chicago

3-10 August 2016
Chicago IL USA
US/Central timezone
There is a live webcast for this event.

## Cosmology and particle physics with POLARBEAR and Simons Array (15' + 5')

5 Aug 2016, 15:30
20m
Chicago 10 ()

### Chicago 10

Oral Presentation Astro-particle Physics and Cosmology

### Speaker

MASAYA HASEGAWA (KEK)

### Description

POLARBEAR is a ground-based CMB polarization experiment that is designed to characterize the B-mode (curl component) signal both at degree and sub-degree angular-scales. The degree-scale polarization data can be used for quantitative studies on inflation, such as the reconstruction of the energy scale of inflation. The sub-degree polarization data are an excellent tracer of large-scale structure in the universe, and can be used to constrain the sum of the neutrino masses. POLARBEAR-1 started observing in the early 2012 at 150 GHz with an array of 1274 polarization-sensitive antenna-coupled tansition-edge sensor (TES) bolometers, and achieved the first detection of the sub-degree B-mode signal with CMB data alone. The upgraded receiver (POLARBEAR-2) is being developed, and will be deployed in 2016/2017 austral summer season in Atacama desert in Chile. The observation with three POLARBEAR-2 type receivers (Simons Array project) will be started in 2018. The Simons Array will create a detailed survey of B-mode polarization using three arrays each of 7588 TES bolometer arrays, and will cover three frequency bands at 95, 150, 220 GHz for foreground control. The projected constraints on a tensor-to-scalar ratio (amplitude of inflationary B-mode signal) is σ(r=0.1) = $6.0 \times 10^{-3}$ after foreground removal ($4.0 \times 10^{-3}$ (stat.)), and the sensitivity to the sum of the neutrino masses when combined with DESI spectroscopic galaxy survey data is 40 meV at 1-sigma after foreground removal (19 meV(stat.)). In this presentation we will describe the current status and the prospects of the POLARBEAR-2 receiver system and the Simons Array project.

### Primary author

MASAYA HASEGAWA (KEK)