English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a measurement of the $B$-mode polarization power spectrum of thecosmic microwave background (CMB) using taken from July 2014 to December 2016with the POLARBEAR experiment. The CMB power spectra are measured usingobservations at 150 GHz with an instantaneous array sensitivity of$\mathrm{NET}_\mathrm{array}=23\, \mu \mathrm{K} \sqrt{\mathrm{s}}$ on a 670square degree patch of sky centered at (RA,Dec)=($+0^\mathrm{h}12^\mathrm{m}0^\mathrm{s},-59^\circ18^\prime$). Acontinuously rotating half-wave plate is used to modulate polarization and tosuppress low-frequency noise. We achieve $32\,\mu\mathrm{K}$-$\mathrm{arcmin}$effective polarization map noise with a knee in sensitivity of $\ell = 90$,where the inflationary gravitational wave signal is expected to peak. Themeasured $B$-mode power spectrum is consistent with a $\Lambda$CDM lensing andsingle dust component foreground model over a range of multipoles $50 \leq \ell\leq 600$. The data disfavor zero $C_\ell^{BB}$ at $2.2\sigma$ using this$\ell$ range of POLARBEAR data alone. We cross-correlate our data with Planckhigh frequency maps and find the low-$\ell$ $B$-mode power in the combineddataset to be consistent with thermal dust emission. We place an upper limit onthe tensor-to-scalar ratio $r < 0.90$ at 95% confidence level aftermarginalizing over foregrounds.

A Measurement of the Degree Scale CMB B-mode Angular Power Spectrum with POLARBEAR