Article
Astronomy & Astrophysics
Ginevra Favole, Benjamin R. Granett, Javier Silva Lafaurie, Domenico Sapone
Summary: The study investigates the jackknife method for internal covariance estimation in large-scale structure surveys, exploring the impact of jackknife size and number of resamplings on the precision of the covariance estimate and errors in cosmological parameters. Results show that the baryon acoustic scale error estimate is independent of the jackknife scale, while the shift parameter a exhibits variations in error estimates from different datasets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Richard Watkins, Trey Allen, Collin James Bradford, Albert Ramon Jr, Alexandra Walker, Hume A. Feldman, Rachel Cionitti, Yara Al-Shorman, Ehsan Kourkchi, R. Brent Tully
Summary: We estimated the bulk flow in a volume of radii 150-200 h(-1) Mpc using the minimum variance method with data from the CosmicFlows-4 (CF4) catalogue. The addition of new data in the CF4 increased the estimate of the bulk flow in a sphere of radius 150 h(-1) Mpc compared to the CosmicFlows-3 (CF3). The bulk flow in CF4 has a low probability of occurring in the standard cosmological model, and on scales of 200 h(-1) Mpc, it is in even greater tension with the standard model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Kevin S. McCarthy, Zhongxu Zhai, Yun Wang
Summary: In this study, the optimal phenomenological models for measuring the power spectrum were explored using a realistic Roman galaxy mock catalogue. The best model combinations were found to be P-dw(k|k(*)) * F-HM * M-B and P-dw(k|k(*)) * F-SAM * M-B. These models were comparable to the Effective Field Theory of Large-Scale Structure perturbation theory model across the entire redshift range. The developed tools are expected to be useful in accurately and robustly probing dark energy and testing gravity using the Roman telescope.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Fabien Lacasa
Summary: This study explores the utilization of the full shape information of the galaxy power spectrum and the advancement of analyses to smaller non-linear scales. The findings reveal a striking behavior in the information content of most cosmological and astrophysical parameters, where the information initially increases but the rate of increase slows down until reaching saturation beyond the perturbative regime. However, in the highly non-linear regime, the information shows a steep slope, suggesting potential improvements in dark energy constraints.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Alex Smith, Shaun Cole, Cameron Grove, Peder Norberg, Pauline Zarrouk
Summary: Realistic light-cone mocks are crucial in clustering analyses of large galaxy surveys. By joining together snapshots in spherical shells, approximate light-cones can be created. We evaluated the two-point clustering measurements of central galaxies in approximate light-cones constructed from the Millennium-XXL simulation with different numbers of snapshots. The real-space correlation function's monopole and quadrupole are significantly enhanced at small scales due to duplications of galaxies at the boundaries between snapshots in the light-cone.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Punyakoti Ganeshaiah Veena, Robert Lilow, Adi Nusser
Summary: We evaluate a neural network method for reconstructing cosmological density and velocity fields from incomplete and discrete galaxy distributions. The auto-encoder architecture successfully captures non-linear features and exhibits weaker power suppression on small scales compared to the traditional Wiener filter.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. D. Amaral, T. Vernstrom, B. M. Gaensler
Summary: Researchers conducted an analysis on the statistical characteristics of weak magnetic fields in the intergalactic medium, but did not detect a significant correlation signal. They determined model-dependent upper limits on the parallel magnetic field strength of filaments in the IGM, and noted that these results are consistent with previous findings.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Adam Andrews, Jens Jasche, Guilhem Lavaux, Fabian Schmidt
Summary: Detecting and measuring a non-Gaussian signature of primordial origin in the density field is a major science goal of next generation galaxy surveys. A field-level approach by Bayesian forward modelling the entire three-dimensional galaxy survey is presented to extract information on primordial non-Gaussianity. The method demonstrates potential improvements of a factor similar to 2.5 over current published constraints and provides a promising complementary path for analyzing next-generation surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Louis Coates, Julian Adamek, Philip Bull, Caroline Guandalin, Chris Clarkson
Summary: The paper presents a suite of 53 fully relativistic simulations using the gevolution code, covering a wide range of cosmological observations. These simulations allow for statistical studies and calculation of derivatives of any relativistic observable with respect to cosmological parameters. As an example application, the cross-correlation between Doppler magnification and CDM + baryon density contrast is computed and studied.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Shadab Alam, John A. Peacock, Daniel J. Farrow, J. Loveday, A. M. Hopkins
Summary: This study presents an improved model for analyzing redshift-space distortions of galaxy clustering, using mock galaxy catalogues within the framework of the halo model. By applying a Markov Chain Monte Carlo algorithm, detailed constraints on the kinematic degrees of freedom for satellite galaxies within haloes are derived, allowing for better measurements of perturbation growth rate predictions through redshift-space distortions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Agustin M. Rodriguez-Medrano, Dante J. Paz, Federico A. Stasyszyn, Facundo Rodriguez, Andres N. Ruiz, Manuel Merchan
Summary: Research has shown that galaxies in cosmic voids exhibit delayed evolution compared to the rest of the Universe, indicating interactions between galaxies and their environment. The extent to which large-scale structures influence the properties of void galaxies, or if they are primarily influenced by the low local density typical of these regions, remains unclear. In this study, cosmic voids were identified in SDSS-DR16, and the g-r colour, star formation rate, and concentration of galaxies were examined. Results showed that galaxies in voids had bluer colours, higher star formation rates, and lower concentrations, particularly for haloes of a certain mass. Additionally, the properties of galaxies were found to be sensitive to the type of void they inhabited, suggesting a correlation between galaxy properties and the large-scale environment provided by voids.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ahmad Mehrabi, Mehdi Rezaei
Summary: The study found that the results of the cosmographic approach are not precise enough compared to other methods, especially showing significant biases at higher redshifts. Due to providing biased results, the cosmographic approach is not the best method for reconstructing cosmographic functions.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Tyann Dumerchat, Julian E. Bautista
Summary: In this study, Baryon acoustic oscillations (BAOs) were measured through a joint fit of power spectrum and correlation function multipoles. The method showed smaller biases on BAO parameters compared to individual fitting of power spectra or correlation functions. The estimated uncertainties were slightly larger than those from the Gaussian approximation, but considered more reliable due to fewer assumptions and consideration of correlations between Fourier and configuration space.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Maksym Tsizh, Vitalii Tymchyshyn, Franco Vazza
Summary: In this work, Wasserstein distance combined with persistent homology is used to discriminate large-scale structures of simulated universes with different sigma(8) cosmological parameter values. The advantage of this approach is its non-parametric way of probing the topology of the cosmic web, in contrast to graph-theoretical approaches. By treating the haloes of the cosmic web as points in a point cloud, persistent homologies are calculated and Wasserstein distance is evaluated between them. It is shown that Wasserstein distance can effectively compare simulated cosmic webs with different sigma(8) parameters, with the highest discriminating power at z = 2 snapshots.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Marika Asgari, Indiarose Friswell, Mijin Yoon, Catherine Heymans, Andrej Dvornik, Benjamin Joachimi, Patrick Simon, Joe Zuntz
Summary: The study introduces a mitigation strategy to reduce the impact of non-linear galaxy bias on the joint cosmological analysis of weak lensing and galaxy surveys, utilizing Psi-statistic to minimize contributions from smallest physical scales and showing comparable constraining power to standard two-point galaxy clustering statistics. It demonstrates a significant decrease in bias on cosmological parameter S-8 when analyzing Psi-statistics compared to standard two-point correlation functions, highlighting the importance of moving towards new statistics less sensitive to smallest physical scales in 3 x 2pt analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Kenji Kadota, Jinn-Ouk Gong, Kiyotomo Ichiki, Takahiko Matsubara
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2015)
Article
Astronomy & Astrophysics
Takahiko Matsubara
Article
Astronomy & Astrophysics
D. Munshi, B. Hu, T. Matsubara, P. Coles, A. Heavens
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2016)
Article
Astronomy & Astrophysics
Shintaro Yoshiura, Hayato Shimabukuro, Keitaro Takahashi, Takahiko Matsubara
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
Kazuhiro Kogai, Takahiko Matsubara, Atsushi J. Nishizawa, Yuko Urakawa
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Takahiko Matsubara
Article
Astronomy & Astrophysics
Shuichiro Yokoyama, Takahiko Matsubara, Atsushi Taruya
Article
Instruments & Instrumentation
A. Blondel, M. Bogomilov, S. Bordoni, F. Cadoux, D. Douqa, K. Dugas, T. Ekelof, Y. Favre, S. Fedotov, K. Fransson, R. Fujita, E. Gramstad, A. K. Ichikawa, S. Ilieva, K. Iwamoto, C. Jesus-Valls, C. K. Jung, S. P. Kasetti, M. Khabibullin, A. Khotjantsev, A. Korzenev, A. Kostin, Y. Kudenko, T. Kutter, T. Lux, L. Maret, T. Matsubara, A. Mefodiev, A. Minamino, O. Mineev, G. Mitev, M. Nessi, L. Nicola, E. Noah, S. Parsa, G. Petkov, F. Sanchez, D. Sgalaberna, W. Shorrock, K. Skwarczynski, S. Suvorov, A. Teklu, R. Tsenov, Y. Uchida, G. Vankova-Kirilova, N. Yershov, M. Yokoyama, J. Zalipska, Y. Zou, W. Zurek
JOURNAL OF INSTRUMENTATION
(2020)
Article
Astronomy & Astrophysics
Takahiko Matsubara, Sandrine Codis
Article
Astronomy & Astrophysics
Takahiko Matsubara
Article
Astronomy & Astrophysics
Hiroyuki Kitamoto, Yoshihisa Kitazawa, Takahiko Matsubara
Article
Astronomy & Astrophysics
Takahiko Matsubara, Takahiro Terada, Kazunori Kohri, Shuichiro Yokoyama
Article
Astronomy & Astrophysics
Takahiko Matsubara
Article
Astronomy & Astrophysics
Takahiko Matsubara, Vincent Desjacques
Article
Astronomy & Astrophysics
Ichihiko Hashimoto, Atsushi Taruya, Takahiko Matsubara, Toshiya Namikawa, Shuichiro Yokoyama