PIRSA:26040122 Conference Cosmology

DOI10.48660/26040122

Conference/School: Cosmological Frontiers in Fundamental Physics 2026

Wen, Y.(. (2026). Relativistic Effects in the 3D Galaxy Power Spectrum. Perimeter Institute. https://pirsa.org/26040122

Wen, Yunfei (Robin). Relativistic Effects in the 3D Galaxy Power Spectrum. Perimeter Institute, Apr. 29, 2026, https://pirsa.org/26040122 

@misc{ pirsa_PIRSA:26040122,
  doi = {10.48660/26040122},
  url = {https://pirsa.org/26040122},
  author = {Wen, Yunfei (Robin)},
  keywords = {Cosmology},
  language = {en},
  title = {Relativistic Effects in the 3D Galaxy Power Spectrum},
  publisher = {Perimeter Institute},
  year = {2026},
  month = {apr},
  note = {PIRSA:26040122 see, \url{https://pirsa.org}}
}

Abstract

The three-dimensional galaxy power spectrum is a powerful probe of local primordial non-Gaussianity (PNG) and linear-order general relativistic (GR) effects on ultra-large scales, accessible to current large-scale structure surveys. In this talk, we present our calculation of GR effects in the spherical Fourier–Bessel (SFB) power spectrum, which naturally incorporates wide-angle geometry and radial evolution on the lightcone. We quantify the impact and measurability of these relativistic contributions, with particular emphasis on SPHEREx—an ongoing NASA Explorer mission aimed to achieve $ \sigma(f_{\rm NL})\sim 1$. These horizon-scale GR signatures provide a potential avenue to test gravity and dark energy through their imprint on metric perturbations, beyond the background expansion.

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