Constraints on Inflationary Gravitational Waves with Two Years of SPT-3G Data
Constraints on Inflationary Gravitational Waves with Two Years of SPT-3G Data
We present a measurement of the $B$-mode polarization power spectrum of the cosmic microwave background anisotropies at 32 $\le$ $\ell$ $<$ 502 for three bands centered at 95, 150, and 220 GHz using data from the SPT-3G receiver on the South Pole Telescope. This work uses SPT-3G observations from the 2019 and 2020 winter observing seasons of a $\sim$1500 deg$^2$ patch of sky that directly overlaps with fields observed with the BICEP/Keck family of telescopes, and covers part of the proposed Simons Observatory and CMB-S4 deep fields. Employing new techniques for mitigating polarized atmospheric noise, the SPT-3G data demonstrates a white noise level of 9.3 (6.7) $\mu$K-arcmin at $\ell \sim 500$ for the 95 GHz (150 GHz) data, with a $1/\ell$ noise knee at $\ell$=128 (182). We fit the observed six auto- and cross-frequency $B$-mode power spectra to a model including lensed $\Lambda$CDM $B$-modes and a combination of Galactic and extragalactic foregrounds. This work characterizes foregrounds in the vicinity of the BICEP/Keck survey area, finding foreground power consistent with that reported by the BICEP/Keck collaboration within the same region, and a factor of $\sim$ 3 higher power over the full SPT-3G survey area. Using SPT-3G data over the BICEP/Keck survey area, we place a 95% upper limit on the tensor-to-scalar ratio of $r < 0.25$ and find the statistical uncertainty on $r$ to be $\sigma(r) = 0.067$.
A. Chokshi、K. R. Dibert、L. E. Bleem、A. Coerver、C. Feng、K. R. Ferguson、K. Fichman、A. Foster、A. Maniyar、E. S. Martsen、F. Menanteau、M. Millea、E. Camphuis、T. -L. Chou、M. A. Dobbs、C. L. Chang、J. A. Zebrowski、C. L. Reichardt、A. J. Anderson、B. Ansarinejad、M. Archipley、L. Balkenhol、P. Barry、K. Benabed、A. N. Bender、B. A. Benson、F. Bianchini、J. Montgomery、S. Galli、T. M. Crawford、C. Daley、T. de Haan、P. Chaubal、P. M. Chichura、K. Prabhu、W. Quan、A. E. Gambrel、R. W. Gardner、F. Ge、Y. Wan、N. Whitehorn、W. L. K. Wu、Y. Nakato、T. Natoli、G. I. Noble、Y. Omori、A. Ouellette、M. Doohan、A. Doussot、D. Dutcher、K. Kornoelje、M. R. Young、N. Goeckner-Wald、S. Raghunathan、Z. Pan、W. Everett、C. -L. Kuo、M. Rahimi、A. Rahlin、M. Rouble、J. E. Ruhl、A. Simpson、F. R. Bouchet、L. Bryant、J. E. Carlstrom、E. Schiappucci、J. A. Sobrin、A. A. Stark、K. Levy、Y. Li、J. Stephen、C. Tandoi、B. Thorne、A. E. Lowitz、C. Trendafilova、C. Umilta、J. D. Vieira、A. G. Vieregg、A. Vitrier、C. Lu、G. P. Lynch、R. Gualtieri、F. Guidi、S. Guns、N. W. Halverson、E. Hivon、G. P. Holder、P. Paschos、K. A. Phadke、A. W. Pollak、W. L. Holzapfel、J. C. Hood、A. Hryciuk、N. Huang、F. Kéruzoré、A. R. Khalife、L. Knox、M. Korman
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A. Chokshi,K. R. Dibert,L. E. Bleem,A. Coerver,C. Feng,K. R. Ferguson,K. Fichman,A. Foster,A. Maniyar,E. S. Martsen,F. Menanteau,M. Millea,E. Camphuis,T. -L. Chou,M. A. Dobbs,C. L. Chang,J. A. Zebrowski,C. L. Reichardt,A. J. Anderson,B. Ansarinejad,M. Archipley,L. Balkenhol,P. Barry,K. Benabed,A. N. Bender,B. A. Benson,F. Bianchini,J. Montgomery,S. Galli,T. M. Crawford,C. Daley,T. de Haan,P. Chaubal,P. M. Chichura,K. Prabhu,W. Quan,A. E. Gambrel,R. W. Gardner,F. Ge,Y. Wan,N. Whitehorn,W. L. K. Wu,Y. Nakato,T. Natoli,G. I. Noble,Y. Omori,A. Ouellette,M. Doohan,A. Doussot,D. Dutcher,K. Kornoelje,M. R. Young,N. Goeckner-Wald,S. Raghunathan,Z. Pan,W. Everett,C. -L. Kuo,M. Rahimi,A. Rahlin,M. Rouble,J. E. Ruhl,A. Simpson,F. R. Bouchet,L. Bryant,J. E. Carlstrom,E. Schiappucci,J. A. Sobrin,A. A. Stark,K. Levy,Y. Li,J. Stephen,C. Tandoi,B. Thorne,A. E. Lowitz,C. Trendafilova,C. Umilta,J. D. Vieira,A. G. Vieregg,A. Vitrier,C. Lu,G. P. Lynch,R. Gualtieri,F. Guidi,S. Guns,N. W. Halverson,E. Hivon,G. P. Holder,P. Paschos,K. A. Phadke,A. W. Pollak,W. L. Holzapfel,J. C. Hood,A. Hryciuk,N. Huang,F. Kéruzoré,A. R. Khalife,L. Knox,M. Korman.Constraints on Inflationary Gravitational Waves with Two Years of SPT-3G Data[EB/OL].(2025-05-05)[2025-05-29].https://arxiv.org/abs/2505.02827.点此复制
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