The Latest Constraints on Inflationary B-modes from the BICEP/Keck Telescopes
The Latest Constraints on Inflationary B-modes from the BICEP/Keck Telescopes
For the past decade, the BICEP/Keck collaboration has been operating a series of telescopes at the Amundsen-Scott South Pole Station measuring degree-scale $B$-mode polarization imprinted in the Cosmic Microwave Background (CMB) by primordial gravitational waves (PGWs). These telescopes are compact refracting polarimeters mapping about 2% of the sky, observing at a broad range of frequencies to account for the polarized foreground from Galactic synchrotron and thermal dust emission. Our latest publication "BK18" utilizes the data collected up to the 2018 observing season, in conjunction with the publicly available WMAP and Planck data, to constrain the tensor-to-scalar ratio $r$. It particularly includes (1) the 3-year BICEP3 data which is the current deepest CMB polarization map at the foreground-minimum 95 GHz; and (2) the Keck 220 GHz map with a higher signal-to-noise ratio on the dust foreground than the Planck 353 GHz map. We fit the auto- and cross-spectra of these maps to a multicomponent likelihood model ($\Lambda$CDM+dust+synchrotron+noise+$r$) and find it to be an adequate description of the data at the current noise level. The likelihood analysis yields $\sigma(r)=0.009$. The inference of $r$ from our baseline model is tightened to $r_{0.05}=0.014^{+0.010}_{-0.011}$ and $r_{0.05}<0.036$ at 95% confidence, meaning that the BICEP/Keck $B$-mode data is the most powerful existing dataset for the constraint of PGWs. The up-coming BICEP Array telescope is projected to reach $\sigma(r) \lesssim 0.003$ using data up to 2027.
S. Henderson、B. Racine、G. Halal、W. L. K. Wu、A. Turner、S. Zhang、E. Hand、R. Basu Thakur、R. W. Ogburn IV、S. Harrison、E. M. Leitch、C. Bischoff、H. Boenish、M. Petroff、S. A. Kernasovskiy、G. P. Teply、H. Hui、K. D. Irwin、J. E. Tolan、C. Umilta、M. Halpern、G. C. Hilton、D. C. Goldfinger、S. Kefeli、C. Pryke、R. V. Sudiwala、L. Zeng、M. Crumrine、C. L. Kuo、D. V. Wiebe、Z. Ahmed、K. W. Yoon、M. Dierickx、C. D. Sheehy、J. R. Cheshire IV、L. Moncelsi、Y. Nakato、H. Yang、C. Verges、J. Kang、K. S. Karkare、S. Palladino、K. G. Megerian、C. D. Reintsema、E. V. Denison、J. M. Kovac、S. Fatigoni、E. Karpel、A. Wandui、L. Duband、J. Hubmayr、S. Fliescher、K. L. Thompson、M. Amiri、J. Connors、A. Lennox、P. A. R. Ade、R. Schwarz、C. Yu、C. Zhang、T. St Germaine、J. Grayson、B. Steinbach、B. Singari、A. Schillaci、J. Cornelison、G. Hall、T. Prouve、V. Buza、S. Richter、D. Barkats、C. Tucker、A. G. Vieregg、P. Grimes、J. J. Bock、S. R. Hildebrandt、A. C. Weber、T. Namikawa、C. L. Wong、K. Lau、M. Eiben、E. Young、J. P. Filippini、R. O'Brient、J. Willmert、H. T. Nguyen、N. Goeckner-Wald、D. Beck、:、BICEP/Keck Collaboration、A. Cukierman、E. Bullock、L. Minutolo、C. Giannakopoulos、B. L. Schmitt、A. Soliman
KIPAC/SLACHarvard/CfAStanford UniversityKIPAC/SLACNASA JPLCaltechUniversity of CincinnatiCaltechStanford UniversityHarvard/CfAUniversity of ChicagoUniversity of CincinnatiHarvard/CfAHarvard/CfAStanford UniversityCaltechCaltechStanford UniversityStanford UniversityUniversity of CincinnatiUniversity of British ColumbiaNISTHarvard/CfACaltechUniversity of MinnesotaCardiff UniversityHarvard/CfAUniversity of MinnesotaStanford UniversityUniversity of British ColumbiaKIPAC/SLACStanford UniversityHarvard/CfABrookhaven National LaboratoryMinnesota Institute for AstrophysicsCaltechStanford UniversityStanford UniversityHarvard/CfAStanford UniversityHarvard/CfAUniversity of CincinnatiNASA JPLNISTNISTHarvard/CfAUniversity of British ColumbiaStanford UniversityCaltechSBT GrenobleNISTUniversity of MinnesotaStanford UniversityUniversity of British ColumbiaHarvard/CfAUniversity of Illinois at Urbana-ChampaignCardiff UniversityUniversity of MinnesotaStanford UniversityCaltechHarvard/CfAStanford UniversityCaltechMinnesota Institute for AstrophysicsCaltechHarvard/CfAUniversity of MinnesotaSBT GrenobleUniversity of ChicagoHarvard/CfAHarvard/CfACardiff UniversityUniversity of ChicagoHarvard/CfACaltechCaltechNASA JPLThe University of TokyoHarvard/CfAUniversity of MinnesotaHarvard/CfAStanford UniversityUniversity of Illinois at Urbana-ChampaignCaltechUniversity of MinnesotaNASA JPLStanford UniversityKIPAC/SLACCardiff UniversityCardiff UniversityStanford UniversityMinnesota Institute for AstrophysicsCaltechUniversity of CincinnatiHarvard/CfACaltech
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S. Henderson,B. Racine,G. Halal,W. L. K. Wu,A. Turner,S. Zhang,E. Hand,R. Basu Thakur,R. W. Ogburn IV,S. Harrison,E. M. Leitch,C. Bischoff,H. Boenish,M. Petroff,S. A. Kernasovskiy,G. P. Teply,H. Hui,K. D. Irwin,J. E. Tolan,C. Umilta,M. Halpern,G. C. Hilton,D. C. Goldfinger,S. Kefeli,C. Pryke,R. V. Sudiwala,L. Zeng,M. Crumrine,C. L. Kuo,D. V. Wiebe,Z. Ahmed,K. W. Yoon,M. Dierickx,C. D. Sheehy,J. R. Cheshire IV,L. Moncelsi,Y. Nakato,H. Yang,C. Verges,J. Kang,K. S. Karkare,S. Palladino,K. G. Megerian,C. D. Reintsema,E. V. Denison,J. M. Kovac,S. Fatigoni,E. Karpel,A. Wandui,L. Duband,J. Hubmayr,S. Fliescher,K. L. Thompson,M. Amiri,J. Connors,A. Lennox,P. A. R. Ade,R. Schwarz,C. Yu,C. Zhang,T. St Germaine,J. Grayson,B. Steinbach,B. Singari,A. Schillaci,J. Cornelison,G. Hall,T. Prouve,V. Buza,S. Richter,D. Barkats,C. Tucker,A. G. Vieregg,P. Grimes,J. J. Bock,S. R. Hildebrandt,A. C. Weber,T. Namikawa,C. L. Wong,K. Lau,M. Eiben,E. Young,J. P. Filippini,R. O'Brient,J. Willmert,H. T. Nguyen,N. Goeckner-Wald,D. Beck,:,BICEP/Keck Collaboration,A. Cukierman,E. Bullock,L. Minutolo,C. Giannakopoulos,B. L. Schmitt,A. Soliman.The Latest Constraints on Inflationary B-modes from the BICEP/Keck Telescopes[EB/OL].(2022-03-30)[2025-08-04].https://arxiv.org/abs/2203.16556.点此复制
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