Article
Astronomy & Astrophysics
Florian Beutler, Patrick McDonald
Summary: Recent developments in galaxy redshift surveys have led to the proposal of a matrix-based analysis framework for galaxy power spectrum multipoles, providing deconvolved power spectrum results for several datasets. The use of deconvolved power spectrum multipoles allows for a data analysis independent of survey-specific aspects, such as the window function. This alternative analysis method has been shown to yield similar results to standard analysis in the case of the BOSS dataset, with various analysis components and a Python toolbox provided for convenience.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Pierre Zhang, Yifu Cai
Summary: The study re-analyzed the full shape of the BOSS galaxy two-point function within Lambda-CDM, with results constraining various cosmological parameters. The effect of redshift selection on the results was discussed, emphasizing the importance of systematic assessments for ongoing and future large-volume surveys.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Byeonghee Yu, Uros Seljak, Yin Li, Sukhdeep Singh
Summary: We present growth of structure constraints from the cosmological analysis of the power spectrum multipoles of SDSS-III BOSS DR12 galaxies. We use a galaxy power spectrum model that decomposes galaxies into halo mass bins and combines perturbation theory and halo model to model halo clustering. By constraining a single parameter f sigma 8 to Planck+BAO prior, we reduce the effects of prior volume and mismodeling. Our analysis yields tight constraints on f sigma 8 and discusses the sensitivity of cosmological parameter estimation to various factors.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Dionysios Karagiannis, Roy Maartens, Liantsoa F. Randrianjanahary
Summary: The 21cm emission of neutral hydrogen can be used as a probe to study the matter distribution in the Universe after reionisation. This study presents the first forecasts of the cosmological constraints from the combination of the 21cm power spectrum and bispectrum. Results show that HIRAX and SKAO experiments have different constraining powers on various cosmological parameters, BAO distance functions, and the growth function.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Joyce Byun, Andrea Oddo, Cristiano Porciani, Emiliano Sefusatti
Summary: This study compares the standard method of estimating the bispectrum with the compressed modal bispectrum method, finding that the latter provides consistent and competitive constraints. The modal bispectrum requires fewer expansion coefficients to achieve constraints comparable to the standard bispectrum estimator, demonstrating its efficiency in compression and constraint generation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
L. Raul Abramo, Joao Vitor Dinarte Ferri, Ian Lucas Tashiro, Arthur Loureiro
Summary: This paper presents a method to predict the constraining power of galaxy surveys using the multi-tracer Fisher matrix based on angular power spectra in the linear regime of structure formation, avoiding the impracticality of deriving the Fisher matrix from numerically evaluated covariance matrices.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Emanuele Castorina, Enea Di Dio
Summary: Measurements of galaxy clustering in Fourier space provide insights into the early Universe and the effects of Primordial Non Gaussianities. Relativistic effects can complicate the interpretation of data and may diverge in the Infra-Red. This work calculates the ensemble average of a commonly used Fourier space estimator, considering all general relativistic effects. The study finds that once the individual divergent GR terms are taken into account, there is no Infra-Red sensitivity in the observable. Additionally, the importance of GR effects, including lensing magnification, in interpreting the galaxy power spectrum multipoles is investigated, revealing them to be generally small corrections to the leading redshift space distortions term.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Sheean Jolicoeur, Roy Maartens, Eline M. De Weerd, Obinna Umeh, Chris Clarkson, Stefano Camera
Summary: The study investigates the detectability of first-order relativistic effects in future 21cm intensity mapping surveys, finding that the imaginary contribution of the relativistic signal in the bispectrum increases the detection possibility, albeit typically with a lower signal-to-noise compared to Hα galaxy surveys, due to foreground and telescope beam effects.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Henry S. Grasshorn Gebhardt, Olivier Dore
Summary: In this paper, a custom eigenbasis adapted to any particular survey geometry is derived to retain all information on the diagonal of the 2-point function. It results in a diagonal 2-point function with simple shot noise and a diagonal covariance matrix in the case of a Gaussian random field. The derived basis is used to construct a 3D spherical Fourier-Bessel power spectrum estimator assuming a survey geometry that is separable in the angular and radial directions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Davide Gualdi, Hector Gil-Marin, Licia Verde
Summary: This study conducts a joint analysis of monopole and quadrupoles for power spectrum, bispectrum, and integrated trispectrum from redshift space matter field in N-body simulations. It demonstrates the complementarity of bispectrum and i-trispectrum in constraining key cosmological parameters, providing smaller credible regions compared to traditional power spectrum and bispectrum analyses.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Andrej Obuljen, Will J. Percival
Summary: This study explores the impact of variations in galaxy-pair effective redshift on large-scale clustering in galaxy surveys, finding that surveys spanning a large redshift range have different effective redshifts depending on pair separation and angle, potentially resulting in scale-dependent clustering anisotropy. The effect is demonstrated on the eBOSS DR16 Quasar sample, showing a negligible impact on monopole but a significant tilt in quadrupole and hexadecapole measurements. Strategies for mitigating this effect are discussed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
James M. Sullivan, Uros Seljak, Sukhdeep Singh
Summary: The updated Halo Zeldovich Perturbation Theory (HZPT) model provides an analytic and accurate description of the two-point statistics of dark matter on nonlinear scales, with applications to halo and galaxy clustering as well as galaxy-matter cross-correlation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Dan Pryer, Robert E. Smith, Robin Booth, Chris Blake, Alexander Eggemeier, Jon Loveday
Summary: The study derives expressions for the galaxy power spectrum convolved by survey window in real space, considering the geometric lightcone effect for full sky and deep redshift surveys. It investigates the impact of using the standard mean redshift approximation, showing both overall amplitude suppression and scale-dependent error compared to the 'true' spectrum. However, it also demonstrates that accurate approximation to the full model can be achieved by carefully choosing an 'effective fixed-time' within a certain range of scales.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Marcel Schmittfull, Marko Simonovic, Mikhail M. Ivanov, Oliver H. E. Philcox, Matias Zaldarriaga
Summary: An analytical forward model based on perturbation theory was developed to predict the redshift-space galaxy overdensity, finding residual noise characteristics in simulated galaxy density. Furthermore, comparison of galaxy velocities revealed that about 10% of galaxies contribute to half of the rms velocity residual in the simulated galaxy sample.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Pedro Carrilho, Chiara Moretti, Benjamin Bose, Katarina Markovic, Alkistis Pourtsidou
Summary: Interacting dark energy models are proposed as alternatives to ACDM, and forthcoming galaxy clustering surveys will provide constraints on these models. This study compares three approaches of modeling non-linearities, considering a model with a simple 1-parameter extension to wCDM. Analysis using simulated data shows that the EFTofLSS-based model is better at describing data up to smaller scales and extracting more information, forecasting uncertainties on the dark energy equation of state and interaction parameter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)