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
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
Thomas Floss, Tim de Wild, P. Daniel Meerburg, Leon V. E. Koopmans
Summary: In this study, we investigate the possibility of using tomography of 21-cm brightness temperature fluctuations during the Dark Ages as a means to constrain primordial non-Gaussianity. We improve previous models by including the effect of the free electron fraction and derive the secondary bispectrum as well as the secondary trispectrum of 21-cm brightness temperature fluctuations. We find that although secondary non-Gaussianity dominates the signal, primordial non-Gaussianity can still be extracted with significantly higher signal-to-noise ratios than current and future CMB experiments.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
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
Daniel Baumann, Daniel Green
Summary: This paper discusses the impact of nonlinear structure formation on the study of primordial non-Gaussianity and proposes a method to measure non-Gaussianity in the position space maps of the large-scale structure. The study shows that map-level analysis can significantly improve the constraining power over non-Gaussianity.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Jan-Albert Viljoen, Jose Fonseca, Roy Maartens
Summary: Next-generation cosmological surveys will observe larger cosmic volumes, providing information on the primordial Universe and relativistic effects. By combining 21cm intensity mapping surveys and optical galaxy surveys, we can suppress cosmic variance on ultra-large scales and improve precision.
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
Benjamin Bose, Joyce Byun, Fabien Lacasa, Azadeh Moradinezhad Dizgah, Lucas Lombriser
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Emanuele Castorina, Azadeh Moradinezhad Dizgah
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Marcel Schmittfull, Azadeh Moradinezhad Dizgah
Summary: Modern galaxy surveys focus on the galaxy power spectrum or 2-point correlation function to test and constrain cosmological models. By computing the cross-power spectrum between the squared galaxy density and the galaxy density, all contributions to the tree-level redshift-space galaxy bispectrum can be captured. This simple solution shows that the measurement pipeline matches analytical predictions and theoretical expectations on galaxy bias parameters and the logarithmic growth rate.
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
Marta B. Silva, Ely D. Kovetz, Garrett K. Keating, Azadeh Moradinezhad Dizgah, Matthieu Bethermin, Patrick C. Breysse, Kirit Karkare, Jose L. Bernal, Jacques Delabrouille
Summary: This paper outlines the science case for line-intensity mapping with a space-borne instrument targeting the sub-millimeter (microwaves) to the far-infrared (FIR) wavelength range. The goal is to observe and characterize the large-scale structure in the Universe and understand the mechanisms that drive galaxy formation and evolution. The proposed frequency range will enable tracing molecular gas and dust evolution, constrain the cosmic star formation rate density, and provide diagnostics of galaxies and AGN.
EXPERIMENTAL ASTRONOMY
(2021)
Article
Astronomy & Astrophysics
Jacques Delabrouille, Maximilian H. Abitbol, Nabila Aghanim, Yacine Ali-Haimoud, David Alonso, Marcelo Alvarez, Anthony J. Banday, James G. Bartlett, Jochem Baselmans, Kaustuv Basu, Nicholas Battaglia, Jose Ramon Bermejo Climent, Jose L. Bernal, Matthieu Bethermin, Boris Bolliet, Matteo Bonato, Francois R. Bouchet, Patrick C. Breysse, Carlo Burigana, Zhen-Yi Cai, Jens Chluba, Eugene Churazov, Helmut Dannerbauer, Paolo De Bernardis, Gianfranco De Zotti, Eleonora Di Valentino, Emanuela Dimastrogiovanni, Akira Endo, Jens Erler, Simone Ferraro, Fabio Finelli, Dale Fixsen, Shaul Hanany, Luke Hart, Carlos Hernandez-Monteagudo, J. Colin Hill, Selim C. Hotinli, Kenichi Karatsu, Kirit Karkare, Garrett K. Keating, Ildar Khabibullin, Alan Kogut, Kazunori Kohri, Ely D. Kovetz, Guilaine Lagache, Julien Lesgourgues, Mathew Madhavacheril, Bruno Maffei, Nazzareno Mandolesi, Carlos Martins, Silvia Masi, John Mather, Jean-Baptiste Melin, Azadeh Moradinezhad Dizgah, Tony Mroczkowski, Suvodip Mukherjee, Daisuke Nagai, Mattia Negrello, Nathalie Palanque-Delabrouille, Daniela Paoletti, Subodh P. Patil, Francesco Piacentini, Srinivasan Raghunathan, Andrea Ravenni, Mathieu Remazeilles, Vincent Reveret, Louis Rodriguez, Aditya Rotti, Jose-Alberto Rubino Martin, Jack Sayers, Douglas Scott, Joseph Silk, Marta Silva, Tarun Souradeep, Naonori Sugiyama, Rashid Sunyaev, Eric R. Switzer, Andrea Tartari, Tiziana Trombetti, Inigo Zubeldia
Summary: This paper discusses the scientific justification for a sensitive spectro-polarimetric survey of the microwave sky, which would provide valuable insights into various aspects of cosmology, fundamental physics, and astrophysics.
EXPERIMENTAL ASTRONOMY
(2021)
Article
Astronomy & Astrophysics
Azadeh Moradinezhad Dizgah, Garrett K. Keating, Kirit S. Karkare, Abigail Crites, Shouvik Roy Choudhury
Summary: Line intensity mapping (LIM) is an important technique for mapping the large-scale structure of the universe and exploring cosmology. By measuring the auto-power spectra of CO rotational lines and the [C II] fine-structure line, LIM surveys can constrain properties of neutrinos and light relics. When combined with existing cosmic microwave background data, LIM surveys can significantly improve constraints on N-eff and M-nu.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Suvodip Mukherjee, Azadeh Moradinezhad Dizgah
Summary: This study proposes a novel data-driven, multi-messenger technique to investigate the connection between compact objects (such as neutron stars, black holes, and supermassive black holes) and the chemical composition of galaxies. By analyzing the correlation between gravitational waves and atomic/molecular emission-line signals, it is possible to measure the delay time distribution and provide data-driven constraints.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Fabien Lacasa, Marie Aubert, Philippe Baratta, Julien Carron, Adelie Gorce, Sylvain Gouyou Beauchamps, Louis Legrand, Azadeh Moradinezhad Dizgah, Isaac Tutusaus
Summary: This paper presents a formula for calculating the precision matrix of super-sample covariance (SSC) and demonstrates its applications in cosmological analyses. The study shows that inaccurate modeling of SSC responses has a significant impact on cosmological constraints in stage IV surveys.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
ChangHoon Hahn, Michael Eickenberg, Shirley Ho, Jiamin Hou, Pablo Lemos, Elena Massara, Chirag Modi, Azadeh Moradinezhad Dizgah, Bruno Regaldo-Saint Blancard, Muntazir M. Abidi
Summary: Simulation-Based Inference of Galaxies (SIMBIG) is a forward modeling framework that uses simulation-based inference to analyze galaxy clustering. It accurately infers the parameters of galaxy clustering and effectively handles observational systematics. The framework has been validated through a mock challenge, demonstrating its robustness and capability to handle different statistical measures.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Jiamin Hou, Azadeh Moradinezhad Dizgah, ChangHoon Hahn, Elena Massara
Summary: Extracting non-Gaussian information from higher-order clustering statistics is crucial for upcoming galaxy surveys. We investigate the information content of redshift-space weighted skew spectra and show that they significantly improve parameter constraints compared to power spectrum multipoles. Additionally, we find that skew spectra provide competitive constraints compared to bispectrum monopole and outperform it for all cosmological parameters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Elena Massara, Francisco Villaescusa-Navarro, ChangHoon Hahn, Muntazir M. Abidi, Michael Eickenberg, Shirley Ho, Pablo Lemos, Azadeh Moradinezhad Dizgah, Bruno Regaldo-Saint Blancard
Summary: Marked power spectra are two-point statistics of a marked field obtained by weighting each location with a function that depends on the local density around that point. We consider marked power spectra of the galaxy field in redshift space that up-weight low-density regions, and we perform a Fisher matrix analysis to assess the information content of this type of statistics using the Molino mock catalogs built on the Quijote simulations. Our results show that each of the four marked power spectra can tighten the standard power spectrum constraints on the cosmological parameters by 15%-25% and on σ(8) by a factor of 2. When combining the standard and four marked power spectra, the improvement in the power spectrum constraints is equal to a factor of 6 for σ(8) and a factor of 2.5-3 for the other parameters.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Azadeh Moradinezhad Dizgah, Garrett K. Keating
ASTROPHYSICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Azadeh Moradinezhad Dizgah, Garrett K. Keating, Anastasia Fialkov
ASTROPHYSICAL JOURNAL LETTERS
(2019)