Primordial Gravitational Waves from Galaxy Intrinsic Alignments
Jan 16, 2020
49 pages
Published in:
- JCAP 07 (2020) 005
- Published: Jul 2, 2020
e-Print:
- 2001.05930 [astro-ph.CO]
View in:
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Abstract: (arXiv)
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 field. We also show that a certain class of tensor non-Gaussianities produced during inflation can leave a signature in the density-weighted galaxy shape power spectrum. We estimate the possibility of observing such imprints in future galaxy surveys.Note:
- 24+23 pages, 6 figures, code available at https://gitlab.com/mbiagetti/tensor_fossil, updated to published version
- perturbation: tensor
- gravitational radiation: primordial
- density: perturbation
- galaxy
- power spectrum
- inflation
- non-Gaussianity
- bispectrum
- chiral
- gravitational radiation
References(158)
Figures(11)