Journal Article Ppublish 1 citation
PubMed: 39373453 DOI: 10.1103/PhysRevLett.133.121001
Apparent Parity Violation in the Observed Galaxy Trispectrum.
Phys Rev Lett 133(12):121001
Authors: Pritha Paul, Chris Clarkson, Roy Maartens
Affiliations
- Astronomy Unit, School of Physical and Chemical Sciences, <a href="https://ror.org/026zzn846">Queen Mary University of London</a>, London E1 4NS, United Kingdom.
- Department of Physics and Astronomy, <a href="https://ror.org/00h2vm590">University of the Western Cape</a>, Cape Town 7535, South Africa.
- <a href="https://ror.org/01jgv6w72">National Institute for Theoretical and Computational Sciences</a>, Cape Town 7535, South Africa.
- Institute of Cosmology and Gravitation, <a href="https://ror.org/03ykbk197">University of Portsmouth</a>, Portsmouth PO1 3FX, United Kingdom.
Abstract
Recent measurements of the four-point correlation function in large-scale galaxy surveys have found apparent evidence of parity violation in the distribution of galaxies. This cannot happen via dynamical gravitational effects in general relativity. If such a violation arose from physics in the early Universe it could indicate important new physics beyond the standard model, and would be at odds with most models of inflation. It is therefore now timely to consider the galaxy trispectrum in more detail. While the intrinsic four-point correlation function, or equivalently the trispectrum, its Fourier counterpart, is parity invariant, the observed trispectrum must take redshift-space distortions into account. Although the standard Newtonian correction also respects parity invariance, we show that subleading relativistic corrections do not. We demonstrate that these can be significant at intermediate linear scales and are dominant over the Newtonian parity-invariant part around the equality scale and above. Therefore when observing the galaxy four-point correlation function, we should expect to detect parity violation on large scales.
MeSH
Physics, Parity