Parameter constraints from cross-correlation of CMB lensing with galaxy clustering
Abstract
The lensing convergence measurable with future CMB surveys like CMB-S4 will be highly correlated with the clustering observed by deep photometric large scale structure (LSS) surveys such as the LSST, with cross-correlation coefficient as high as 95%. This will enable use of sample variance cancellation techniques to determine cosmological parameters, and use of cross-correlation measurements to break parameter degeneracies. Assuming large sky overlap between CMB-S4 and LSST, we show that a joint analysis of CMB-S4 lensing and LSST clustering can yield very tight constraints on the matter amplitude σ8(z), halo bias, and fNL, competitive with the best stage IV experiment predictions, but using complementary methods, which may carry different and possibly lower systematics. Having no sky overlap between experiments degrades the precision of σ8(z) by a factor of 20, and that of fNL by a factor of 1.5 to 2. Without CMB lensing, the precision always degrades by an order of magnitude or more, showing that a joint analysis is critical. Here, our results also suggest that CMB lensing in combination with LSS photometric surveys is a competitive probe of the evolution of structure in the redshift range z ≃ 1–7, probing a regime that is not well tested observationally.more »
- Authors:
-
- Inst. for Advanced Study, Princeton, NJ (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1544261
- Alternate Identifier(s):
- OSTI ID: 1457576
- Grant/Contract Number:
- AC02-05CH11231; ST/H008586/1; ST/K00333X/1; NNX15AL17G; ST/J005673/1
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 12; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Schmittfull, Marcel, and Seljak, Uroš. Parameter constraints from cross-correlation of CMB lensing with galaxy clustering. United States: N. p., 2018.
Web. doi:10.1103/PhysRevD.97.123540.
Schmittfull, Marcel, & Seljak, Uroš. Parameter constraints from cross-correlation of CMB lensing with galaxy clustering. United States. https://doi.org/10.1103/PhysRevD.97.123540
Schmittfull, Marcel, and Seljak, Uroš. Thu .
"Parameter constraints from cross-correlation of CMB lensing with galaxy clustering". United States. https://doi.org/10.1103/PhysRevD.97.123540. https://www.osti.gov/servlets/purl/1544261.
@article{osti_1544261,
title = {Parameter constraints from cross-correlation of CMB lensing with galaxy clustering},
author = {Schmittfull, Marcel and Seljak, Uroš},
abstractNote = {The lensing convergence measurable with future CMB surveys like CMB-S4 will be highly correlated with the clustering observed by deep photometric large scale structure (LSS) surveys such as the LSST, with cross-correlation coefficient as high as 95%. This will enable use of sample variance cancellation techniques to determine cosmological parameters, and use of cross-correlation measurements to break parameter degeneracies. Assuming large sky overlap between CMB-S4 and LSST, we show that a joint analysis of CMB-S4 lensing and LSST clustering can yield very tight constraints on the matter amplitude σ8(z), halo bias, and fNL, competitive with the best stage IV experiment predictions, but using complementary methods, which may carry different and possibly lower systematics. Having no sky overlap between experiments degrades the precision of σ8(z) by a factor of 20, and that of fNL by a factor of 1.5 to 2. Without CMB lensing, the precision always degrades by an order of magnitude or more, showing that a joint analysis is critical. Here, our results also suggest that CMB lensing in combination with LSS photometric surveys is a competitive probe of the evolution of structure in the redshift range z ≃ 1–7, probing a regime that is not well tested observationally. We explore predictions against other surveys and experiment configurations, finding that wide patches with maximal sky overlap between CMB and LSS surveys are most powerful for σ8(z) and fNL.},
doi = {10.1103/PhysRevD.97.123540},
journal = {Physical Review D},
number = 12,
volume = 97,
place = {United States},
year = {Thu Jun 28 00:00:00 EDT 2018},
month = {Thu Jun 28 00:00:00 EDT 2018}
}
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