Kavli Affiliate: Susan E. Clark
| First 5 Authors: Carlos Hervías-Caimapo, Ari J. Cukierman, Patricia Diego-Palazuelos, Kevin M. Huffenberger, Susan E. Clark
| Summary:
We extend the dust-filament-based model presented in Herv’ias-Caimapo &
Huffenberger 2022 to produce parity-violating foreground spectra by
manipulating the filament orientations relative to the magnetic field. We
calibrate our model to observations of the misalignment angle using
cross-correlations of Planck and HI 21-cm line data, producing a fiducial model
that predicts a $mathcal{D}_{ell}^{EB}sim$few $mu$K$^2$ dust signal at 353
GHz and where $sim 56$% of filaments have a positive misalignment angle. The
main purpose of this model is to be used as dust with non-zero parity-violating
emission in forecasting a measurement of cosmic birefringence by upcoming
experiments. Here, we also use our fiducial model to assess the impact of dust
in measurements of the isotropic cosmic birefringence angle $beta$ with Planck
data by measuring the misalignment angle as a function of scale, as well as
directly using our model’s $mathcal{D}_{ell}^{EB}$ prediction as a template.
In both cases, we measure $beta$ to be consistent within $0.83sigma$ of the
equivalent measurements with Planck data and its derivatives.
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