Article
Astronomy & Astrophysics
Aoife Boyle, Fabian Schmidt
Summary: The study demonstrates the impact of improving galaxy clustering and CMB lensing predictions on forecasted neutrino mass constraints, with additional parameters weakening the constraints on M-nu. CMB lensing plays a significant role in alleviating these degeneracies and tightening the final constraints, while the constraint on the optical depth to reionisation tau strongly affects the constraint on M-nu. Overall, the assumptions of a flat ACDM universe remain crucial in determining the constraints, and neglecting nonlinear corrections can introduce significant shifts in the inferred neutrino mass.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Davide Gualdi, Sergi Novell, Hector Gil-Marin, Licia Verde
Summary: The study focuses on the power spectrum, bispectrum, and i-trispectrum, finding that the i-trispectrum provides significant improvements in constraining local primordial non-Gaussianity amplitude parameters. Using simulated data, the added-value provided by the i-trispectrum is quantified, showing up to a 32% reduction in constraints on f(nl) in redshift space compared to constraints obtained without the i-trispectrum.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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
Noah Sailer, Emanuele Castorina, Simone Ferraro, Martin White
Summary: By using a Fisher matrix formalism based on recent advances in Lagrangian perturbation theory, constraints for future spectroscopic and 21-cm surveys on the standard cosmological model and its extensions were forecasted and compared with those achievable by current or near-future surveys, such as DESI and Euclid, under the same forecasting formalism. Additionally, comparisons were made between the formalism used and traditional linear methods.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Azadeh Moradinezhad Dizgah, Matteo Biagetti, Emiliano Sefusatti, Vincent Desjacques, Jorge Norena
Summary: Upcoming galaxy redshift surveys are expected to improve limits on primordial non-Gaussianity (PNG) through measurements in Fourier space. A Monte-Carlo Markov Chain analysis was performed to confront perturbation theory predictions with N-body simulations, focusing on the local model of PNG parameterized by f(NL). Informative priors on the linear non-Gaussian bias parameter can significantly improve constraints on f(NL) in statistical inference.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
ChangHoon Hahn, Francisco Villaescusa-Navarro
Summary: This study examines the constraining power of the redshift-space galaxy bispectrum monopole, B-0(g), on cosmological parameters and the information content down to nonlinear scales. The results show that B-0(g) significantly improves the constraints on cosmological parameters, especially for M-nu.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Miguel Aparicio Resco, Antonio L. Maroto
Summary: FARO is a new public Python code that computes the Fisher matrix for galaxy survey observables, allowing for tomographic and model-independent analysis, and forecasting the sensitivity of future galaxy surveys like DESI, Euclid, J-PAS and LSST.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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
Andrea Oddo, Federic Rizzo, Emiliano Sefusatti, Cristiano Porciani, Pierluigi Monaco
Summary: In this study, a joint likelihood analysis of the halo power spectrum and bispectrum in real space was conducted using a large set of numerical simulations and halo mock catalogs. Constraints on bias and cosmological parameters were derived, and a reference bias model dependent on seven parameters was selected based on the Deviance Information Criterion. This model accurately recovers three selected cosmological parameters even for extreme simulation volumes, demonstrating the importance of considering relations among bias parameters and full covariance estimation from mock catalogs.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alexandre Barreira, Titouan Lazeyras, Fabian Schmidt
Summary: The study uses field-level forward models of galaxy clustering and EFT likelihood formalism to infer the relations between linear bias parameters (b(1), b(2), b(K2)) in self-consistently simulated galaxies. It finds that bias relations in total mass selected objects are broadly preserved in simulated galaxies selected by various characteristics, and shows good agreement with observed galaxy samples. The use of EFT likelihood also recovers sigma(8) values from different galaxy samples, demonstrating the potential of forward models in inferring cosmological information from galaxy data.
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
Tobias Nadolny, Ruth Durrer, Martin Kunz, Hamsa Padmanabhan
Summary: A novel approach is presented to disentangle two key contributions to the largest-scale anisotropy of the galaxy distribution, allowing for a relatively accurate measurement of our peculiar velocity and the intrinsic anisotropy of large-scale structures in galaxy surveys. The method enables two simultaneous tests of the Cosmological Principle, comparing observations of our peculiar velocity with the CMB dipole and testing for significant effects beyond the standard cosmological model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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
Nhat-Minh Nguyen, Fabian Schmidt, Guilhem Lavaux, Jens Jasche
Summary: The study found that the cross-correlation coefficient between true and inferred phases reacts weakly to all ingredients, and the bias in the amplitude of the inferred initial conditions strongly depends on the bias model and the likelihood. The bias model and likelihood hold the key to an unbiased cosmological inference by controlling the systematic errors arising from marginalized sub-grid physics.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Mikhail M. Ivanov, Sergey Sibiryakov
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
M. M. Ivanov, Y. Y. Kovalev, M. L. Lister, A. G. Panin, A. B. Pushkarev, T. Savolainen, S. Troitsky
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Mikhail M. Ivanov, Alexander A. Kaurov, Sergey Sibiryakov
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Anagha Vasudevan, Mikhail M. Ivanov, Sergey Sibiryakovd, Julien Lesgourguesf
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Diego Blas, Andrea Caputo, Mikhail M. Ivanov, Laura Sberna
PHYSICS OF THE DARK UNIVERSE
(2020)
Article
Astronomy & Astrophysics
Anton Chudaykin, Dmitry Gorbunov, Nikita Nedelko
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Anton Chudaykin, Mikhail M. Ivanov, Marko Simonovic
Summary: This paper discusses the impact of theoretical uncertainties in large-scale structure data analysis and how to incorporate these uncertainties in power spectrum likelihoods. The inclusion of theoretical errors has several advantages over the standard practice of using k(max) sharp momentum cut, providing reliable constraints with unbiased error bars. In realistic settings, the theoretical error likelihood yields essentially the same parameter constraints as the standard analysis, effectively optimizing the choice of k(max).
Article
Astronomy & Astrophysics
Anton Chudaykin, Konstantin Dolgikh, Mikhail M. Ivanov
Summary: This study presents limits on the parameters of ΛCDM, w(0)CDM, and w(0)w(a)CDM models obtained from a joint analysis of various data sources, independent of cosmic microwave background data. The results show consistency of dark-energy equation of state parameter with a cosmological constant, as well as spatial curvature consistent with a flat universe. The study also demonstrates the strong constraints provided by full-shape and baryon acoustic oscillations data on nonminimal cosmological models.
Article
Astronomy & Astrophysics
F. Bezrukov, A. Chudaykin, D. Gorbunov
Article
Astronomy & Astrophysics
Mikhail M. Ivanov, Marko Simonovic, Matias Zaldarriaga
Article
Astronomy & Astrophysics
F. Bezrukov, A. Chudaykin, D. Gorbunov
Article
Astronomy & Astrophysics
A. Chudaykin, D. Gorbunov, I. Tkachev
Article
Astronomy & Astrophysics
E. Bellini, A. Barreira, N. Frusciante, B. Hu, S. Peirone, M. Raveri, M. Zumalacarregui, A. Avilez-Lopez, M. Ballardini, R. A. Battye, B. Bolliet, E. Calabrese, Y. Dirian, P. G. Ferreira, F. Finelli, Z. Huang, M. M. Ivanov, J. Lesgourgues, B. Li, N. A. Lima, F. Pace, D. Paoletti, I. Sawicki, A. Silvestri, C. Skordis, C. Umilta, F. Vernizzi