The dipole of the galaxy bispectrum
arXiv:1812.09512 · doi:10.1093/mnrasl/slz066
Abstract
The bispectrum will play an important role in future galaxy surveys. On large scales it is a key probe for measuring primordial non-Gaussianity which can help differentiate between different inflationary models and other theories of the early universe. On these scales a variety of relativistic effects come into play once the galaxy number-count fluctuation is projected onto our past lightcone. We show for the first time that the leading relativistic correction from these distortions in the galaxy bispectrum generates a significant dipole, mainly from relativistic redshift space distortions. The amplitude of the dipole can be more than 10% of the monopole even on equality scales. Such a dipole is absent in the Newtonian approximation to the redshift space bispectrum, so it offers a clear signature of relativistic effects on cosmological scales in large scale structure.
arXiv comment5 pages, 2 figures. v2 has slight changes to the figures and is the version to appear in MNRAS Letters
References in corpus (26)
- Efficient Computation of CMB anisotropies in closed FRW models
- Large-Scale Galaxy Bias
- The linear power spectrum of observed source number counts
- The Bispectrum as a Signature of Gravitational Instability in Redshift-Space
- Cosmological information in the redshift-space bispectrum
- Beyond the Linear-Order Relativistic Effect in Galaxy Clustering: Second-Order Gauge-Invariant Formalism
- Galaxy number counts to second order and their bispectrum
- Gravitational redshift and other redshift-space distortions of the imaginary part of the power spectrum
- Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
- Large-scale bias in the Universe II: redshift space bispectrum
- Observed galaxy number counts on the lightcone up to second order: I. Main result
- Isolating relativistic effects in large-scale structure
- The full-sky relativistic correlation function and power spectrum of galaxy number counts: I. Theoretical aspects
- Measuring cosmic velocities with 21cm intensity mapping and galaxy redshift survey cross-correlation dipoles
- A general relativistic signature in the galaxy bispectrum: the local effects of observing on the lightcone
- The Full-Sky Angular Bispectrum in Redshift Space
- Disantangling the effects of Doppler velocity and primordial non-Gaussianity in galaxy power spectra
- The relativistic dipole and gravitational redshift on LSS
- Observed galaxy number counts on the lightcone up to second order: III. Magnification Bias
- Optimised angular power spectra for spectroscopic galaxy surveys
- Synergies between intensity maps of hydrogen lines
- Imprints of local lightcone projection effects on the galaxy bispectrum. II
- Imprints of local lightcone projection effects on the galaxy bispectrum. III Relativistic corrections from nonlinear dynamical evolution on large-scales
- Nonlinear modulation of the HI power spectrum on ultra-large scales. I
- Higher multipoles of the galaxy bispectrum in redshift space
- Imprints of local lightcone projection effects on the galaxy bispectrum IV: Second-order vector and tensor contributions
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- Magnification and evolution biases in large-scale structure surveys
- Towards a self-consistent analysis of the anisotropic galaxy two- and three-point correlation functions on large scales: application to mock galaxy catalogues
- Detecting the relativistic galaxy bispectrum
- Bispectrum-window convolution via Hankel transform
- Detecting the relativistic bispectrum in 21cm intensity maps
- Wide-angle and relativistic effects in Fourier-space clustering statistics
- New constraints on cosmological modified gravity theories from anisotropic three-point correlation functions of BOSS DR12 galaxies
- Local primordial non-Gaussianity in the relativistic galaxy bispectrum
- Quantifying the Redshift Space Distortion of the Bispectrum II: Induced Non-Gaussianity at Second Order Perturbation
- General and consistent statistics for cosmological observations
- Multi-tracer power spectra and bispectra: Formalism
- Full-sky bispectrum in redshift space for 21cm intensity maps
- Modal compression of the redshift-space galaxy bispectrum
- Multipoles of the relativistic galaxy bispectrum
- The relativistic galaxy number counts in the weak field approximation
- Observing relativistic features in large-scale structure surveys -- II: Doppler magnification in an ensemble of relativistic simulations
- The Odd-Parity Galaxy Bispectrum
- Observing relativistic features in large-scale structure surveys -- I: Multipoles of the power spectrum
- A fast estimator for quantifying the shape dependence of the 3D bispectrum
- Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum
- Tetrad formalism for exact cosmological observables
- Wide-angle effects in the galaxy bispectrum
- GEOMAX: beyond linear compression for 3pt galaxy clustering statistics
- Quantifying the redshift space distortion of the bispectrum III : Detection prospects of the multipole moments
- Relativistic distortions in galaxy density-ellipticity correlations: gravitational redshift and peculiar velocity effects
- Apparent parity violation in the observed galaxy trispectrum
- Multi-Scale Perturbation Theory I: Methodology and Leading-Order Bispectrum Corrections in the Matter-Dominated Era
- Decoupling Local Primordial non-Gaussianity from Relativistic Effects in the Galaxy Bispectrum
- From matter to galaxies: General relativistic bias for the one-loop bispectrum
- Relativistic and non-Gaussianity contributions to the one-loop power spectrum
- Multi-wavelength spectroscopic probes: prospects for primordial non-Gaussianity and relativistic effects
- Multipoles of the galaxy bispectrum on a light cone: wide-separation and relativistic corrections
- The Odd-Parity Part of the Observed Galaxy Trispectrum
- Visualising relativistic effects in redshift space distortions of large scale structure
- Non-Gaussianity in the Squeezed Three-Point Correlation from the Relativistic Effects