Synergies between radio, optical and microwave observations at high redshift
Abstract
© 2019 IOP Publishing Ltd and Sissa Medialab. We study synergies between three promising methods to measure 22 and suffer from interloper problems even for spectroscopic surveys. Intensity mapping of the 21-cm signal can cover large volumes with exquisite fidelity, but is limited both by loss of information to foreground cleaning and by lack of knowledge of the mean signal. Cosmic microwave background (CMB) lensing is theoretically very clean, but ultimately measures just the projected variations in density. We find that cross-correlation between optical and radio can significantly improve the measurement of growth rate. Combining these with the CMB provides a promising avenue to detecting modified gravity at high redshifts, in particular by independently probing the Weyl and Newtonian potentials and by strengthening control of systematics. We find that cross-correlating a Stage ii 21-cm survey with DESI quasars with a reasonable brightness temperature prior could enable measurements of the growth rate fσ8 at sub 3% and sub 8% levels at z = 3, 4, representing a factor of 4 and 8 improvement over constraints obtainable from DESI quasars alone. Similarly, cross-correlating 21-cm data with a futuristic LBG survey to mUV<24.5 over 1000 square degrees will make possible fσ8 measurements atmore »
- Authors:
-
- Univ. of California, Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States); Berkeley Center for Cosmological Physics, Berkeley, CA (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- University of California, Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- OSTI Identifier:
- 1557099
- Alternate Identifier(s):
- OSTI ID: 1593667; OSTI ID: 1594715; OSTI ID: 1604691
- Report Number(s):
- BNL-211961-2019-JAAM
Journal ID: ISSN 1475-7516
- Grant/Contract Number:
- SC0017860; 1713791; DGE1106400; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2019; Journal Issue: 07; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; synergy; CMB; DESI; spectroscopic; optical; cosmic; LSST; quasar; 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Chen, Shi-Fan, Castorina, Emanuele, White, Martin, and Slosar, Anže. Synergies between radio, optical and microwave observations at high redshift. United States: N. p., 2019.
Web. doi:10.1088/1475-7516/2019/07/023.
Chen, Shi-Fan, Castorina, Emanuele, White, Martin, & Slosar, Anže. Synergies between radio, optical and microwave observations at high redshift. United States. https://doi.org/10.1088/1475-7516/2019/07/023
Chen, Shi-Fan, Castorina, Emanuele, White, Martin, and Slosar, Anže. Mon .
"Synergies between radio, optical and microwave observations at high redshift". United States. https://doi.org/10.1088/1475-7516/2019/07/023. https://www.osti.gov/servlets/purl/1557099.
@article{osti_1557099,
title = {Synergies between radio, optical and microwave observations at high redshift},
author = {Chen, Shi-Fan and Castorina, Emanuele and White, Martin and Slosar, Anže},
abstractNote = {© 2019 IOP Publishing Ltd and Sissa Medialab. We study synergies between three promising methods to measure 22 and suffer from interloper problems even for spectroscopic surveys. Intensity mapping of the 21-cm signal can cover large volumes with exquisite fidelity, but is limited both by loss of information to foreground cleaning and by lack of knowledge of the mean signal. Cosmic microwave background (CMB) lensing is theoretically very clean, but ultimately measures just the projected variations in density. We find that cross-correlation between optical and radio can significantly improve the measurement of growth rate. Combining these with the CMB provides a promising avenue to detecting modified gravity at high redshifts, in particular by independently probing the Weyl and Newtonian potentials and by strengthening control of systematics. We find that cross-correlating a Stage ii 21-cm survey with DESI quasars with a reasonable brightness temperature prior could enable measurements of the growth rate fσ8 at sub 3% and sub 8% levels at z = 3, 4, representing a factor of 4 and 8 improvement over constraints obtainable from DESI quasars alone. Similarly, cross-correlating 21-cm data with a futuristic LBG survey to mUV<24.5 over 1000 square degrees will make possible fσ8 measurements at close to 1% at z = 3 and 3% at z = 4, and improve similar constraints at z = 5 by close to a factor of 3 to sub-10% precision. Combining the above with CMB lensing from a Stage 4 CMB survey and LSST data can additionally constrain the gravitational slip γ parameter to similar precision at these redshifts, enabling us to test the predictions of general relativity at large scales.},
doi = {10.1088/1475-7516/2019/07/023},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2019,
place = {United States},
year = {Mon Jul 15 00:00:00 EDT 2019},
month = {Mon Jul 15 00:00:00 EDT 2019}
}
Web of Science
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