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Probing dipolar power asymmetry with galaxy clustering and intrinsic alignments

Keita Minato1, Atsushi Taruya2,3,4, Teppei Okumura5,3, and Maresuke Shiraishi6,7

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Phys. Rev. D 114, 043534 – Published 18 August, 2026

DOI: https://doi.org/10.1103/n2s7-fl28

Abstract

We investigate the prospects for probing large-scale power asymmetry through galaxy clustering and intrinsic alignments (IA) in stage IV galaxy surveys. Specifically, we consider a dipolar modulation in the primordial power spectrum and evaluate the Fisher information matrix using the two-point statistics of both the galaxy clustering and IA. Our analysis reveals that while IA alone provides limited improvement in constraining the modulation amplitude, the cross-spectrum between galaxy density and IA can contribute up to half the constraining power of galaxy clustering, especially for surveys with low galaxy bias and high number density of galaxies, such as Euclid. This demonstrates the potential of IA-clustering cross-correlations as a robust consistency check against systematics, and highlights the complementary roles of galaxy clustering and IA in constraining the asymmetry. We also show that marginalizing over galaxy bias and IA bias parameters has a negligible impact on the final constraint on the modulation amplitude.

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Phys. Rev. D 114, 043534– Published 18 August, 2026
  • Received 14 June 2025
  • Accepted 9 July 2026
Article part of CHORUS
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