The Odd-Parity Galaxy Bispectrum. (arXiv:1906.05198v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Jeong_D/0/1/0/all/0/1">Donghui Jeong</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schmidt_F/0/1/0/all/0/1">Fabian Schmidt</a>
The galaxy bispectrum contains a wealth of information about the early
universe, gravity, as well as astrophysics such as galaxy bias. In this paper,
we study the parity-odd part of the galaxy bispectrum which is hitherto
unexplored. In the standard cosmological model, the odd-parity bispectrum is
generated by galaxy velocities through redshift-space distortions. While small
in the case of General Relativity coupled with smooth dark energy, the signal
could be larger in modified gravity scenarios. Thus, apart from being a very
useful consistency test of measurements of galaxy clustering, the odd
bispectrum offers a novel avenue for searching for new physics.
The galaxy bispectrum contains a wealth of information about the early
universe, gravity, as well as astrophysics such as galaxy bias. In this paper,
we study the parity-odd part of the galaxy bispectrum which is hitherto
unexplored. In the standard cosmological model, the odd-parity bispectrum is
generated by galaxy velocities through redshift-space distortions. While small
in the case of General Relativity coupled with smooth dark energy, the signal
could be larger in modified gravity scenarios. Thus, apart from being a very
useful consistency test of measurements of galaxy clustering, the odd
bispectrum offers a novel avenue for searching for new physics.
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