Article
Astronomy & Astrophysics
L. Gelo, C. J. A. P. Martins, N. Quevedo, A. M. M. Vieira
Summary: The redshift dependence of the cosmic microwave background temperature has important implications for fundamental cosmology, and its constraining power is comparable to other background cosmology probes.
Article
Astronomy & Astrophysics
L. Balkenhol, C. L. Reichardt
Summary: This study evaluates the performance of four different conditioning schemes through simulation experiments to reduce the estimation errors in the covariance matrix and ensure reliable parameter constraints. The results show that for the minimal conditioning strategy, the uncertainty on the recovered best-fitting parameter may be higher than the apparent posterior width from the likelihood, and stronger priors can reduce the misestimation of parameter uncertainties. Empirical estimates perform better with higher subsets numbers.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Pratyush Pranav
Summary: We present a topological analysis of temperature fluctuation maps from two datasets of Planck satellite. The analysis reveals that the observations are generally consistent with the simulations for the NPIPE dataset, while there are significant deviations for the FFP10 dataset in some cases. The behavior of topological components and loops show contrasting results between the two datasets. The study provides important insights into understanding the cosmic microwave background radiation.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Mario Ballardini, Roy Maartens
Summary: Measuring the total neutrino mass using large-scale clustering in 21 cm intensity mapping and photometric galaxy surveys, with cosmic microwave background information, can dramatically reduce uncertainty to sigma(M-nu) similar or equal to 45 meV. Adding information from Legacy Survey of Space and Time can further improve the forecast to sigma(M-nu) similar or equal to 12 meV.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
E. Gjerlow, H. T. Ihle, S. Galeotta, K. J. Andersen, R. Aurlien, R. Banerji, M. Bersanelli, S. Bertocco, M. Brilenkov, M. Carbone, L. P. L. Colombo, H. K. Eriksen, M. K. Foss, C. Franceschet, U. Fuskeland, M. Galloway, S. Gerakakis, B. Hensley, D. Herman, M. Iacobellis, M. Ieronymaki, J. B. Jewell, A. Karakci, E. Keihaenen, R. Keskitalo, G. Maggio, D. Maino, M. Maris, S. Paradiso, B. Partridge, M. Reinecke, A. -s. Suur-Uski, T. L. Svalheim, D. Tavagnacco, H. Thommesen, D. J. Watts, I. K. Wehus, A. Zacchei
Summary: We propose a Bayesian calibration algorithm for CMB observations, applied to the Planck LFI data within the BEYONDPLANCK framework. The algorithm decomposes the gain into three components and uses Gibbs sampling to sample each term conditionally. The calibration results show good agreement with previous pipelines and improved inter-frequency consistency.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Louis Legrand, Julien Carron
Summary: Precise reconstruction of the cosmic microwave background lensing potential can be achieved by iteratively removing lensing-induced B modes using deep polarization surveys. A lensing spectrum estimator and its likelihood are introduced to improve the robustness of the estimator to uncertainties in the data modeling. Map-based reconstructions demonstrate unbiased recovery of cosmology and improved constraints on lensing amplitude compared to traditional methods.
Article
Astronomy & Astrophysics
M-A Sanchis-Lozano, F. Melia, M. Lopez-Corredoira, N. Sanchis-Gual
Summary: Recent research has found that there is a maximum correlation angle in the two-point angular temperature correlations of cosmic microwave background (CMB) radiation, which contradicts the prediction of standard cosmology. The angular power spectrum of the CMB also shows a dominance of odd-over-even parity multipoles. This paper examines the relationship between these features and their impact on the theoretical fit to the Planck 2018 data. The results suggest that considering both the maximum correlation angle and the parity imbalance is crucial for optimizing the fit.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
R. Aurich, D. Reinhardt
Summary: The study investigates the use of invariant scalar measures derived from first and second order covariant derivatives on the sphere to detect distortions in the observed CMB sky map caused by the aberration effect at high multipoles, providing an independent method for determining our peculiar velocity. The eigenvalues of the Hessian matrix of the temperature field are found to be well suited for this task.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Zhengyi Wang, Ji Yao, Xiangkun Liu, Dezi Liu, Zuhui Fan, Bin Hu
Summary: We conducted a forecast study on the cross-correlation between cosmic shear tomography from CSST and CMB lensing from AliCPT-1 in Tibet. By generating correlated galaxy and CMB lensing signals, we accounted for various sources of error and estimated the cross-spectra in four tomographic bins. The total cross-correlation SNR was found to be approximately 15 (AliCPT-1 '4 modules*yr') and 22 (AliCPT-1 '48 modules*yr').
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tirthankar Roy Choudhury, Suvodip Mukherjee, Sourabh Paul
Summary: By comparing predictions of a physical seminumerical model with CMB data, constraints on allowed reionization histories were studied, leading to the determination of tight constraints on parameters such as reionization duration and halo mass. Analysis showed implications for future CMB surveys and 21 cm studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Erik Rosenberg, Steven Gratton, George Efstathiou
Summary: This study presents angular power spectra and cosmological parameter constraints using the Planck PR4 (NPIPE) maps of the cosmic microwave background. The results show excellent consistency between NPIPE and the Planck 2018 maps at the parameter level, indicating the robustness of the Planck cosmology. The lower noise of NPIPE leads to tighter constraints, providing more precise measurements of the cosmological parameters including beyond-Lambda CDM parameters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ye-Peng Yan, Guo-Jian Wang, Si-Yu Li, Jun-Qing Xia
Summary: Primordial B-mode detection is a major goal of next-generation cosmic microwave background (CMB) experiments. The detection and removal of the lensing effect is crucial to accurately measure the primordial B-mode signal and improve the constraint of primordial gravitational waves (PGWs). In this study, a deep convolutional neural network model called MIMO-UNet is introduced for CMB delensing, which achieves promising results in reconstructing the unlensed CMB polarization maps and recovering the primordial E-mode and B-mode power spectra.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
Peter Adshead, Niayesh Afshordi, Emanuela Dimastrogiovanni, Matteo Fasiello, Eugene A. Lim, Gianmassimo Tasinato
Summary: Characterizing the physical properties of the SGWB, focusing on anisotropies, can be an effective probe of early universe physics by cross correlating with the CMB. This can provide a smoking gun for primordial SGWB anisotropies.
Article
Astronomy & Astrophysics
M. Lopez, P. Bonizzi, K. Driessens, G. Koekoek, J. A. de Vries, R. Westra
Summary: In this research, a new methodology is proposed for detecting ring-like structures called Hawking points (HPs) in the Cosmic Microwave Background (CMB). By analyzing artificial data and comparing it with actual observations, the method's performance is evaluated. Although no significant ring-like structures were found, the largest number of HP candidates were reported, highlighting the need for further theoretical and experimental research in this area.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Martin de los Rios
Summary: This work presents the results of studying the cosmic microwave background temperature-temperature power spectrum using auto-encoders to estimate cosmological parameters and compute power spectra. The encoder estimates the parameters with a precision of 0.004% to 0.2%, and the decoder computes the power spectra with a mean error of 0.0018%. The study led to the development of the COSMIC-KITE PYTHON software, which reduces computation time significantly.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xiaosheng Zhao, Yi Mao, Cheng Cheng, Benjamin D. Wandelt
Summary: In this study, a DELFI-3D CNN approach is used for Bayesian inference of reionization parameters in 21 cm images, and it is shown to outperform conventional methods. This approach effectively utilizes the information in three-dimensional 21 cm images and has good scalability.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Nicolas Chartier, Benjamin D. Wandelt
Summary: The study proposes a new method to address the challenge of estimating the covariance matrix Sigma with a large number of simulations. By combining a small number of simulations with fast surrogates, the method obtains low-noise estimates of Sigma that are unbiased by construction. The numerical examples show significant variance reductions for different elements of the matter power spectrum covariance matrix using this method.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Francisco Villaescusa-Navarro, Benjamin D. Wandelt, Daniel Angles-Alcazar, Shy Genel, Jose Manuel Zorrilla Matilla, Shirley Ho, David N. Spergel
Summary: Many studies have found that a wealth of cosmological information can be found on small scales, but there are challenges in utilizing this information due to the lack of an optimal estimator and the uncertain impact of baryonic effects. This work demonstrates that neural networks can achieve the extraction of maximum cosmological information while marginalizing over baryonic effects in simple scenarios, using power spectra and 2D Gaussian density fields as training data.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Francisco Villaescusa-Navarro, Shy Genel, Daniel Angles-Alcazar, Leander Thiele, Romeel Dave, Desika Narayanan, Andrina Nicola, Yin Li, Pablo Villanueva-Domingo, Benjamin Wandelt, David N. Spergel, Rachel S. Somerville, Jose Manuel Zorrilla Matilla, Faizan G. Mohammad, Sultan Hassan, Helen Shao, Digvijay Wadekar, Michael Eickenberg, Kaze W. K. Wong, Gabriella Contardo, Yongseok Jo, Emily Moser, Erwin T. Lau, Luis Fernando Machado Poletti Valle, Lucia A. Perez, Daisuke Nagai, Nicholas Battaglia, Mark Vogelsberger
Summary: This paper presents the Cosmology and Astrophysics with Machine Learning Simulations (CAMELS) Multifield Data set (CMD), which contains millions of 2D maps and 3D grids from more than 2000 simulated universes. CMD is designed for training machine-learning models and is the largest data set of its kind. The paper describes CMD in detail and focuses on parameter inference as one of its applications.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2022)
Article
Astronomy & Astrophysics
Andrina Nicola, Francisco Villaescusa-Navarro, David N. Spergel, Jo Dunkley, Daniel Angles-Alcazar, Romeel Dave, Shy Genel, Lars Hernquist, Daisuke Nagai, Rachel S. Somerville, Benjamin D. Wandelt
Summary: In this work, the potential of the electron density auto-power spectrum as a robust probe of cosmological and baryonic feedback is investigated. The constraints provided by the electron number density auto-correlation on Omega(m) and the mean baryon fraction are found to be largely robust to differences in baryonic feedback models implemented in hydrodynamic simulations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
G. Dalya, R. Diaz, F. R. Bouchet, Z. Frei, J. Jasche, G. Lavaux, R. Macas, S. Mukherjee, M. Palfi, R. S. de Souza, B. D. Wandelt, M. Bilicki, P. Raffai
Summary: GLADE+ is an extended version of the GLADE galaxy catalogue, designed for multimessenger searches with advanced gravitational-wave detectors. It combines data from six separate astronomical catalogues and provides estimations for redshift corrections and other parameters to assist in determining the likelihood of galaxies being hosts in gravitational wave searches.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xiaosheng Zhao, Yi Mao, Benjamin D. Wandelt
Summary: This paper presents a new Bayesian inference method that implicitly defines the likelihood function through density estimation likelihood-free inference (DELFI), and applies realistic effects to the mock observations from HERA and SKA. The method accurately recovers posterior distributions for the reionization parameters and outperforms standard MCMC analysis in terms of credible parameter regions. With fast processing time, it is a promising approach for the scientific interpretation of future 21 cm power spectrum observation data.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Nicolas Chartier, Benjamin D. Wandelt
Summary: Predicting the mean and covariance matrix of summary statistics is crucial for comparing cosmological theories with observations, but accurate estimates often require costly simulations. We propose a method called 'CARPool Bayes' that combines simulations and surrogates to solve the inference problem for both the means and covariances, and allows incorporating prior information.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Contarini, G. Verza, A. Pisani, N. Hamaus, M. Sahlen, C. Carbone, S. Dusini, F. Marulli, L. Moscardini, A. Renzi, C. Sirignano, L. Stanco, M. Aubert, M. Bonici, G. Castignani, H. M. Courtois, S. Escoffier, D. Guinet, A. Kovacs, G. Lavaux, E. Massara, S. Nadathur, G. Pollina, T. Ronconi, F. Ruppin, Z. Sakr, A. Veropalumbo, B. D. Wandelt, A. Amara, N. Auricchio, M. Baldi, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V Capobianco, J. Carretero, M. Castellano, S. Cavuoti, R. Cledassou, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, F. Dubath, C. A. J. Duncan, X. Dupac, A. Ealet, S. Farrens, S. Ferriol, P. Fosalba, M. Frailis, E. Franceschi, B. Garilli, W. Gillard, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, L. Guzzo, S. Haugan, W. Holmes, F. Hormuth, K. Jahnke, M. Kummel, S. Kermiche, A. Kiessling, M. Kilbinger, M. Kunz, H. Kurki-Suonio, R. Laureijs, S. Ligori, P. B. Lilje, I Lloro, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, R. Massey, M. Melchior, M. Meneghetti, G. Meylan, M. Moresco, E. Munari, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V Pettorino, S. Pires, G. Polenta, M. Poncet, L. Popa, L. Pozzetti, F. Raison, J. Rhodes, E. Rossetti, R. Saglia, B. Sartoris, P. Schneider, A. Secroun, G. Seidel, G. Sirri, C. Surace, P. Tallada-Crespi, A. N. Taylor, I Tereno, R. Toledo-Moreo, F. Torradeflot, E. A. Valentijn, L. Valenziano, Y. Wang, J. Weller, G. Zamorani, J. Zoubian, S. Andreon, D. Maino, S. Mei
Summary: This paper thoroughly explores the constraining power of the void size function on the properties of dark energy from the Euclid mission. The results showcase the impressive power of the void size function from the Euclid spectroscopic sample.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Christina D. Kreisch, Alice Pisani, Francisco Villaescusa-Navarro, David N. Spergel, Benjamin D. Wandelt, Nico Hamaus, Adrian E. Bayer
Summary: GIGANTES is the largest and most realistic void catalog suite ever released, containing over 1 billion cosmic voids and providing new opportunities in the study of voids, while strengthening constraints on cosmological parameters by adding additional information. Combining with other data, it is also predicted that voids can independently determine the mass of neutrinos.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Sultan Hassan, Francisco Villaescusa-Navarro, Benjamin Wandelt, David N. Spergel, Daniel Angles-Alcazar, Shy Genel, Miles Cranmer, Greg L. Bryan, Romeel Dave, Rachel S. Somerville, Michael Eickenberg, Desika Narayanan, Shirley Ho, Sambatra Andrianomena
Summary: This study presents a new model, HIFlow, for fast generation of neutral hydrogen maps, which is able to effectively remove astrophysical effects under the condition of cosmology. By training on state-of-the-art simulations, HIFlow can efficiently extract cosmological and astrophysical information.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
William R. Coulton, Francisco Villaescusa-Navarro, Drew Jamieson, Marco Baldi, Gabriel Jung, Dionysios Karagiannis, Michele Liguori, Licia Verde, Benjamin D. Wandelt
Summary: Primordial non-Gaussianity (PNG) is a powerful probe of the early universe, and measurements of the large-scale structure of the universe can transform our understanding of this area. To address the challenge of relating late-time universe measurements to primordial perturbations, a suite of N-body simulations called QUIJOTE-PNG is released. These simulations investigate the extraction of information on PNG by extending power spectrum and bispectrum measurements beyond the perturbative regime at z = 0.0.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yun-Ting Cheng, Benjamin D. Wandelt, Tzu-Ching Chang, Olivier Dore
Summary: We propose a data-driven technique for analyzing multifrequency images from cosmological surveys. Our method uses full information from the data to simultaneously constrain the large-scale structure (LSS), spectra, redshift distribution, and noise without any prior assumptions. The method does not rely on source detection or redshift estimates. We demonstrate the technique with a mock observation and show its potential for analyzing different types of sources in current or future cosmological data sets.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
William R. Coulton, Francisco Villaescusa-Navarro, Drew Jamieson, Marco Baldi, Gabriel Jung, Dionysios Karagiannis, Michele Liguori, Licia Verde, Benjamin D. Wandelt
Summary: We investigate the amount of information that can be obtained about different types of primordial non-Gaussianity (PNG) from small-scale measurements of the halo field. By using simulations and various measurements, including the power spectrum and bispectrum, we explore the potential of breaking degeneracies between PNG and other parameters. Our results show that different types of PNG can be constrained more effectively through different measurements and scales, with equilateral non-Gaussianity being particularly challenging to constrain.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yongseok Jo, Shy Genel, Benjamin Wandelt, Rachel S. Somerville, Francisco Villaescusa-Navarro, Greg L. Bryan, Daniel Angles-Alcazar, Daniel Foreman-Mackey, Dylan Nelson, Ji-hoon Kim
Summary: This study employs implicit likelihood inference (ILI) to calibrate the parameters of cosmological hydrodynamic simulations. The researchers use neural networks as emulators trained on a dataset of 1000 cosmological simulations to estimate observables and perform ILI to obtain posterior distributions of the parameters. The study finds degeneracies between parameters inferred from the emulated cosmic star formation rate density (SFRD), which can be broken by using the stellar mass functions (SMFs) as complementary constraints.
ASTROPHYSICAL JOURNAL
(2023)