Primordial Gravitational Waves from Galaxy Intrinsic Alignments

@article{Biagetti2020PrimordialGW,
  title={Primordial Gravitational Waves from Galaxy Intrinsic Alignments},
  author={M. Biagetti and G. Orlando},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  year={2020}
}
  • M. Biagetti, G. Orlando
  • Published 2020
  • Physics
  • arXiv: Cosmology and Nongalactic Astrophysics
  • Galaxy shapes have been observed to align with external tidal fields generated by the large-scale structures of the Universe. While the main source for these tidal fields is provided by long-wavelength density perturbations, tensor perturbations also contribute with a non-vanishing amplitude at linear order. We show that parity-breaking gravitational waves produced during inflation leave a distinctive imprint in the galaxy shape power spectrum which is not hampered by any scalar-induced tidal… CONTINUE READING

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