Kavli Affiliate: Eiichiro Komatsu
| First 5 Authors: Toshiki Kurita, Toshiki Kurita, , ,
| Summary:
We present a comprehensive study of galaxy intrinsic alignment (IA) as a
probe of parity-violating primordial non-Gaussianity (PNG). Within the
effective field theory (EFT) framework, we show that the parity-odd IA power
spectrum is sensitive to the collapsed limit of the parity-odd primordial
trispectrum. For a $U(1)$-gauge inflationary model, the IA power spectrum is
proportional to the power spectrum of the curvature perturbation, $P_zeta(k)
propto k^-3$. However, the proportionality constants contain not only the
PNG amplitude but also undetermined EFT bias parameters. We use $N$-body
simulations to determine the bias parameters for dark matter halos. Using these
bias parameters, we forecast IA’s constraining power, assuming data from the
Dark Energy Spectroscopic Instrument (DESI) and the Rubin Observatory Legacy
Survey of Space and Time (LSST). We find that the IA power spectrum can improve
the current limits on the amplitude of parity-violating PNG derived from galaxy
four-point correlation and CMB trispectrum analyses. Moreover, galaxy shapes
are complementary to these probes as they are sensitive to different scales and
trispectrum configurations. Beyond galaxy shapes, we develop a new method to
generate initial conditions for simulations and forward models from the
parity-odd trispectrum with an enhanced collapsed limit.
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