Evidence for baryon acoustic oscillations from galaxy–ellipticity correlations

Xu, Kun; Jing, Y. P.; Zhao, Gong-Bo; Cuesta, Antonio J.

doi:10.1038/s41550-023-02035-4

Cited by 6 publications

(2 citation statements)

References 46 publications

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“…For example, refs. [11,12] recently examined the cross correlation between galaxy shapes and densities in the Sloan Digital Survey to respectively enhance BAO and redshift-space distortions measurements. Beyond these, since shapes are tensors they can potentially probe different primordial physics than densities, for example in the case of anisotropic primordial non-Gaussianity [13][14][15][16][17].…”

Section: Jcap01(2024)027mentioning

confidence: 99%

A Lagrangian theory for galaxy shape statistics

Chen,

Kokron

2024

J. Cosmol. Astropart. Phys.

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We formulate the Lagrangian perturbation theory of galaxy intrinsic alignments and compute the resulting auto and cross power spectra of galaxy shapes, densities and matter to 1-loop order. Our model represents a consistent effective-theory description of galaxy shape including the resummation of long-wavelength displacements which damp baryon acoustic oscillations, and includes one linear, three quadratic and two cubic dimensionless bias coefficients at this order, along with counterterms and stochastic contributions whose structure we derive. We compare this Lagrangian model against the three-dimensional helicity spectra of halo shapes measured in N-body simulations by ref. [1] and find excellent agreement on perturbative scales while testing a number of more restrictive bias parametrizations. The calculations presented are immediately relevant to analyses of both cosmic shear surveys and spectroscopic shape measurements, and we make a fast FFTLog-based code spinosaurus publicly available at https://github.com/sfschen/spinosaurus.

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Section: Jcap01(2024)027mentioning

confidence: 99%

A Lagrangian theory for galaxy shape statistics

Chen,

Kokron

2024

J. Cosmol. Astropart. Phys.

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“…The observation of BAO features at different redshifts endorses the propagation of primordial gravitational instability (Cole et al 2005;Eisenstein et al 2005;Fronenberg et al 2023). Xu et al (2023) have recently established evidence for BAOs from galaxy-ellipticity correlations. Tully et al (2023) have presented remarkably strong evidence for the existence of an individual BAO signal at z = 0.068.…”

Section: Introductionmentioning

confidence: 99%

Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features

Gupta

2024

ApJ

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The primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillation (BAO) features observed in the large-scale distribution of galaxies and (b) the angular size measured for the sound horizon due to BAO imprinted in the cosmic microwave background (CMB) anisotropy. The new model is a hybrid model that combines the tired light (TL) theory with a variant of the ΛCDM model in which the cosmological constant is replaced with a covarying coupling constants’ (CCC) parameter α. This model, dubbed the CCC+TL model, can fit the Type Ia supernovae Pantheon+ data as accurately as the ΛCDM model, and also fit the angular size of cosmic dawn galaxies observed by the James Webb Space Telescope, which is in tension with the ΛCDM model. The results we obtained are 151.0 (±5.1) Mpc for the absolute BAO scale at the current epoch, and the angular size of the sound horizon θ sh = 0.°60, matching Planck’s observations at the surface of the last scattering when the baryon density is set to 100% of the matter density and ∣α∣ is increased by 5.6%. It remains to be seen if the new model is consistent with the CMB power spectrum, the Big Bang nucleosynthesis of light elements, and other critical observations.

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Probing cosmology via the clustering of critical points

Shim,

Pichon,

Pogosyan

et al. 2024

Monthly Notices of the Royal Astronomical Society

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Exclusion zones in the cross-correlations between critical points (peak-void, peak-wall, filament-wall, and filament-void) of the density field define quasi-standard rulers that can be used to constrain dark matter and dark energy cosmological parameters. The average size of the exclusion zone is found to scale linearly with the typical distance between extrema. The latter changes as a function of the matter content of the universe in a predictable manner, but its comoving size remains essentially constant in the linear regime of structure growth on large scales, unless the incorrect cosmology is assumed in the redshift–distance relation. This can be used to constrain the dark energy parameters when considering a survey that scans a range of redshifts. The precision of the parameter estimation is assessed using a set of cosmological simulations, and is found to be a 4σ detection of a change in matter content of 5 per cent, or about 3.8σ detection of 50 per cent shift in the dark energy parameter using a full sky survey up to redshift 0.5.

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Evidence for baryon acoustic oscillations from galaxy–ellipticity correlations

Cited by 6 publications

References 46 publications

A Lagrangian theory for galaxy shape statistics

A Lagrangian theory for galaxy shape statistics

Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features

Probing cosmology via the clustering of critical points

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