Kavli Affiliate: Blake Sherwin
| First 5 Authors: Noah Sailer, Joshua Kim, Simone Ferraro, Mathew S. Madhavacheril, Martin White
| Summary:
We infer the growth of large scale structure over the redshift range
$0.4lesssim z lesssim 1$ from the cross-correlation of spectroscopically
calibrated Luminous Red Galaxies (LRGs) selected from the Dark Energy
Spectroscopic Instrument (DESI) legacy imaging survey with CMB lensing maps
reconstructed from the latest Planck and ACT data. We adopt a hybrid effective
field theory (HEFT) model that robustly regulates the cosmological information
obtainable from smaller scales, such that our cosmological constraints are
reliably derived from the (predominantly) linear regime. We perform an
extensive set of bandpower- and parameter-level systematics checks to ensure
the robustness of our results and to characterize the uniformity of the LRG
sample. We demonstrate that our results are stable to a wide range of modeling
assumptions, finding excellent agreement with a linear theory analysis
performed on a restricted range of scales. From a tomographic analysis of the
four LRG photometric redshift bins we find that the rate of structure growth is
consistent with $Lambda$CDM with an overall amplitude that is $simeq5-7%$
lower than predicted by primary CMB measurements with modest $(sim2sigma)$
statistical significance. From the combined analysis of all four bins and their
cross-correlations with Planck we obtain $S_8 = 0.765pm0.023$, which is less
discrepant with primary CMB measurements than previous DESI LRG cross Planck
CMB lensing results. From the cross-correlation with ACT we obtain $S_8 =
0.790^{+0.024}_{-0.027}$, while when jointly analyzing Planck and ACT we find
$S_8 = 0.775^{+0.019}_{-0.022}$ from our data alone and $sigma_8 =
0.772^{+0.020}_{-0.023}$ with the addition of BAO data. These constraints are
consistent with the latest Planck primary CMB analyses at the $simeq
1.6-2.2sigma$ level, and are in excellent agreement with galaxy lensing
surveys.
| Search Query: ArXiv Query: search_query=au:”Blake Sherwin”&id_list=&start=0&max_results=3