The Atacama Cosmology Telescope: delensed power spectra and parameters

Han, Dongwon; Sehgal, Neelima; MacInnis, Amanda; Engelen, Alexander van; Sherwin, Blake D.; Madhavacheril, Mathew S.; Aiola, Simone; Battaglia, Nicholas; Beall, James A.; Becker, Daniel T.; Calabrese, Erminia; Choi, Steve K.; Darwish, Omar; Denison, Edward V.; Devlin, Mark J.; Dunkley, Jo; Ferraro, Simone; Fox, Anna E.; Hasselfield, Matthew; Hill, J. Colin; Hilton, Gene C.; Hilton, Matt; HloÅ¾ek, Renée; Hubmayr, Johannes; Hughes, John P.; Kosowsky, Arthur; Lanen, Jeff Van; Louis, Thibaut; Moodley, Kavilan; Naess, Sigurd; Namikawa, Toshiya; Nati, Federico; Nibarger, John P.; Niemack, Michael D.; Page, Lyman A.; Partridge, Bruce; Qu, Frank J.; Schillaci, Alessandro; Spergel, David N.; Staggs, Suzanne; Storer, Emilie; Wollack, Edward J.

doi:10.1088/1475-7516/2021/01/031

The Atacama Cosmology Telescope: delensed power spectra and parameters

Journal Article · Mon Jan 18 00:00:00 EST 2021 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2021/01/031· OSTI ID:1831102

Han, Dongwon; Sehgal, Neelima; MacInnis, Amanda; Engelen, Alexander van; Sherwin, Blake D.; Madhavacheril, Mathew S.; Aiola, Simone; Battaglia, Nicholas; Beall, James A.; Becker, Daniel T.; Calabrese, Erminia; Choi, Steve K.; Darwish, Omar; Denison, Edward V.; Devlin, Mark J.; Dunkley, Jo; Ferraro, Simone; Fox, Anna E.; Hasselfield, Matthew; Hill, J. Colin more »

We present ΛCDM cosmological parameter constraints obtained from delensed microwave background power spectra. Lensing maps from a subset of DR4 data from the Atacama Cosmology Telescope (ACT) are used to undo the lensing effect in ACT spectra observed at 150 and 98 GHz. At 150 GHz, we remove the lensing distortion with an effective efficiency of 30% (TT), 30% (EE), 26% (TE) and 20% (BB); this results in detections of the delensing effect at 8.7σ (TT), 5.1σ (EE), 2.6σ (TE), and 2.4σ (BB) significance. The combination of 150 and 98 GHz TT, EE, and TE delensed spectra is well fit by a standard ΛCDM model. We also measure the shift in best-fit parameters when fitting delensed versus lensed spectra; while this shift does not inform our ability to measure cosmological parameters, it does provide a three-way consistency check among the lensing inferred from the best-fit parameters, the lensing in the CMB power spectrum, and the reconstructed lensing map. This shift is predicted to be zero when fitting with the correct model since both lensed and delensed spectra originate from the same region of sky. Furthermore, fitting with a ΛCDM model and marginalizing over foregrounds, we find that the shift in cosmological parameters is consistent with zero. Our results show that gravitational lensing of the microwave background is internally consistent within the framework of the standard cosmological model.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Stony Brook University, NY (United States)

Sponsoring Organization:: National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: ACT Collaboration

Grant/Contract Number:: AC02-05CH11231; SC0020441

OSTI ID:: 1831102

Alternate ID(s):: OSTI ID: 2205300

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2021; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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