The Atacama Cosmology Telescope: delensed power spectra and parameters
Abstract
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 inmore »
- Authors:
- more »
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Stony Brook Univ., NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
- Contributing Org.:
- ACT Collaboration
- OSTI Identifier:
- 1831102
- Alternate Identifier(s):
- OSTI ID: 2205300
- Grant/Contract Number:
- AC02-05CH11231; AST-0408698; AST-0965625; AFB-170002; AST-1440226; PHY-0355328; PHY-0855887; PHY-1214379; AST-1513618; AST-1907657; AST-1615657; AST-1814971; NNX13AE56G; NNX14AB58G; SC0020441
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2021; Journal Issue: 01; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
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, Hložek, 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, and Wollack, Edward J. The Atacama Cosmology Telescope: delensed power spectra and parameters. United States: N. p., 2021.
Web. doi:10.1088/1475-7516/2021/01/031.
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, Hložek, 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. The Atacama Cosmology Telescope: delensed power spectra and parameters. United States. https://doi.org/10.1088/1475-7516/2021/01/031
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, Hložek, 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, and Wollack, Edward J. Mon .
"The Atacama Cosmology Telescope: delensed power spectra and parameters". United States. https://doi.org/10.1088/1475-7516/2021/01/031. https://www.osti.gov/servlets/purl/1831102.
@article{osti_1831102,
title = {The Atacama Cosmology Telescope: delensed power spectra and parameters},
author = {Han, Dongwon and Sehgal, Neelima and MacInnis, Amanda and Engelen, Alexander van and Sherwin, Blake D. and Madhavacheril, Mathew S. and Aiola, Simone and Battaglia, Nicholas and Beall, James A. and Becker, Daniel T. and Calabrese, Erminia and Choi, Steve K. and Darwish, Omar and Denison, Edward V. and Devlin, Mark J. and Dunkley, Jo and Ferraro, Simone and Fox, Anna E. and Hasselfield, Matthew and Hill, J. Colin and Hilton, Gene C. and Hilton, Matt and Hložek, Renée and Hubmayr, Johannes and Hughes, John P. and Kosowsky, Arthur and Lanen, Jeff Van and Louis, Thibaut and Moodley, Kavilan and Naess, Sigurd and Namikawa, Toshiya and Nati, Federico and Nibarger, John P. and Niemack, Michael D. and Page, Lyman A. and Partridge, Bruce and Qu, Frank J. and Schillaci, Alessandro and Spergel, David N. and Staggs, Suzanne and Storer, Emilie and Wollack, Edward J.},
abstractNote = {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.},
doi = {10.1088/1475-7516/2021/01/031},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 01,
volume = 2021,
place = {United States},
year = {Mon Jan 18 00:00:00 EST 2021},
month = {Mon Jan 18 00:00:00 EST 2021}
}
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