CHIME/FRB Catalog 1 results: statistical cross-correlations with
  large-scale structure
  The CHIME/FRB Project has recently released its first catalog of fast radio
bursts (FRBs), containing 492 unique sources. We present results from angular
cross-correlations of CHIME/FRB sources with galaxy catalogs. We find a
statistically significant ($p$-value $\sim 10^{-4}$, accounting for
look-elsewhere factors) cross-correlation between CHIME FRBs and galaxies in
the redshift range $0.3 \lesssim z \lesssim 0.5$, in three photometric galaxy
surveys: WISE$\times$SCOS, DESI-BGS, and DESI-LRG. The level of
cross-correlation is consistent with an order-one fraction of the CHIME FRBs
being in the same dark matter halos as survey galaxies in this redshift range.
We find statistical evidence for a population of FRBs with large host
dispersion measure ($\sim 400$ pc cm$^{-3}$), and show that this can plausibly
arise from gas in large halos ($M \sim 10^{14} M_\odot$), for FRBs near the
halo center ($r \lesssim 100$ kpc). These results will improve in future
CHIME/FRB catalogs, with more FRBs and better angular resolution.
