Emulating Simulations of Cosmic Dawn for 21 cm Power Spectrum Constraints on Cosmology, Reionization, and X-Ray Heating

Kern, Nicholas S.; Liu, Adrian; Parsons, Aaron R.; Mesinger, Andrei; Greig, Bradley

doi:10.3847/1538-4357/AA8BB4

Title: Emulating Simulations of Cosmic Dawn for 21 cm Power Spectrum Constraints on Cosmology, Reionization, and X-Ray Heating

Journal Article · Tue Oct 10 00:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA8BB4· OSTI ID:22875711

Kern, Nicholas S.; Liu, Adrian; Parsons, Aaron R. ^[1]; Mesinger, Andrei; Greig, Bradley ^[2]

Department of Astronomy and Radio Astronomy Laboratory, University of California Berkeley, Berkeley, CA 94720 (United States)
Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa (Italy)

Current and upcoming radio interferometric experiments are aiming to make a statistical characterization of the high-redshift 21 cm fluctuation signal spanning the hydrogen reionization and X-ray heating epochs of the universe. However, connecting 21 cm statistics to the underlying physical parameters is complicated by the theoretical challenge of modeling the relevant physics at computational speeds quick enough to enable exploration of the high-dimensional and weakly constrained parameter space. In this work, we use machine learning algorithms to build a fast emulator that can accurately mimic an expensive simulation of the 21 cm signal across a wide parameter space. We embed our emulator within a Markov Chain Monte Carlo framework in order to perform Bayesian parameter constraints over a large number of model parameters, including those that govern the Epoch of Reionization, the Epoch of X-ray Heating, and cosmology. As a worked example, we use our emulator to present an updated parameter constraint forecast for the Hydrogen Epoch of Reionization Array experiment, showing that its characterization of a fiducial 21 cm power spectrum will considerably narrow the allowed parameter space of reionization and heating parameters, and could help strengthen Planck's constraints on σ{sub 8}. We provide both our generalized emulator code and its implementation specifically for 21 cm parameter constraints as publicly available software.

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OSTI ID:: 22875711

Journal Information:: Astrophysical Journal, Vol. 848, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X

Country of Publication:: United States

Language:: English

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Confirmation of Wide-Field Signatures in Redshifted 21 cm Power Spectra Thyagarajan, Nithyanandan; Jacobs, Daniel C.; Bowman, Judd D. arXiv https://doi.org/10.48550/arxiv.1506.06150	text	January 2015
Constraints on the temperature of the intergalactic medium at z=8.4 with 21-cm observations Greig, Bradley; Mesinger, Andrei; Pober, Jonathan C. arXiv https://doi.org/10.48550/arxiv.1509.02158	text	January 2015
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Quantifying discordance in the 2015 Planck CMB spectrum Addison, G. E.; Huang, Y.; Watts, D. J. arXiv https://doi.org/10.48550/arxiv.1511.00055	text	January 2015
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Calibration Requirements for Detecting the 21 cm Epoch of Reionization Power Spectrum and Implications for the SKA Barry, N.; Hazelton, B.; Sullivan, I. arXiv https://doi.org/10.48550/arxiv.1603.00607	text	January 2016
First Limits on the 21 cm Power Spectrum during the Epoch of X-ray heating Ewall-Wice, A.; Dillon, Joshua S.; Hewitt, J. N. arXiv https://doi.org/10.48550/arxiv.1605.00016	text	January 2016
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First Season MWA EoR Power Spectrum Results at Redshift 7 Beardsley, A. P.; Hazelton, B. J.; Sullivan, I. S. arXiv https://doi.org/10.48550/arxiv.1608.06281	text	January 2016
Charting the Parameter Space of the Global 21-cm Signal Cohen, Aviad; Fialkov, Anastasia; Barkana, Rennan arXiv https://doi.org/10.48550/arxiv.1609.02312	text	January 2016
The Impact of Modeling Errors on Interferometer Calibration for 21 cm Power Spectra Ewall-Wice, Aaron; Dillon, Joshua S.; Liu, Adrian arXiv https://doi.org/10.48550/arxiv.1610.02689	text	January 2016
Analysing the 21cm signal from the Epoch of Reionization with artificial neural networks Shimabukuro, Hayato; Semelin, Benoit arXiv https://doi.org/10.48550/arxiv.1701.07026	text	January 2017
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Cosmic Calibration: Constraints from the Matter Power Spectrum and the Cosmic Microwave Background Habib, Salman; Heitmann, Katrin; Higdon, David arXiv https://doi.org/10.48550/arxiv.astro-ph/0702348	text	January 2007
Radio Signatures of HI at High Redshift: Mapping the End of the ``Dark Ages'' Tozzi, Paolo; Madau, Piero; Meiksin, Avery arXiv https://doi.org/10.48550/arxiv.astro-ph/9903139	text	January 1999

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Title: Emulating Simulations of Cosmic Dawn for 21 cm Power Spectrum Constraints on Cosmology, Reionization, and X-Ray Heating

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