Article
Astronomy & Astrophysics
Guillem Domenech, Roya Mohayaee, Subodh P. Patil, Subir Sarkar
Summary: In this study, the tension between the dipole anisotropy of number counts of cosmologically distant sources and the cosmic microwave background (CMB) is investigated. It is found that primordial perturbations with wavelength comparable to or exceeding the Hubble radius can induce a number count dipole, but smaller modes are too small to reconcile the dipole tension.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
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
Viraj Nistane, Mona Jalilvand, Julien Carron, Ruth Durrer, Martin Kunz
Summary: In this study, we propose an estimator for the lensing potential using galaxy number counts, which includes a linear and a quadratic term. Our results demonstrate that this estimator has a significantly higher signal-to-noise ratio compared to the corresponding estimator from intensity mapping. The improved signal-to-noise ratio is attributed to the additional lensing term in the number count angular power spectrum, which appears at linear order. We estimate the signal-to-noise ratio for future photometric surveys and find that it can reach an order of magnitude of 30, particularly at high redshifts (z greater than or similar to 1.5). Therefore, we argue that number counts in photometric surveys are an excellent tool for measuring tomographic lensing spectra.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Philipp Denzel, Jonathan P. Coles, Prasenjit Saha, Liliya L. R. Williams
Summary: This study presents a determination of the Hubble constant based on the analysis of multiple lensing systems, which is consistent with previous measurements but with lower precision. The constraints from lensing are not strong enough to resolve the 'Hubble tension' in cosmology.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Dipak Munshi, Hayden Lee, Cora Dvorkin, Jason D. McEwen
Summary: This paper introduces two kurt-spectra to study the fourth-order statistics of weak lensing convergence maps. The shapes of these spectra are investigated in relation to source redshifts and smoothing angular scales using numerical simulations. Estimators for beyond fourth-order spectra are provided, and their results are compared with theoretical predictions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Zvonimir Vlah, Nora Elisa Chisari, Fabian Schmidt
Summary: Intrinsic galaxy alignments play a significant role in the statistics of galaxy shapes. A formalism using spherical tensors to project galaxy shapes onto the flat sky and calculate two-point functions at next-to-leading order, as well as leading-order three-point functions, has been presented. The results are provided in a numerical implementation-friendly format.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Sandra Baumgartner, Jaiyul Yoo
Summary: Recent analysis of Planck measurements suggests the possibility of a non-flat universe. This study re-examines light propagation in a non-flat universe and provides gauge-invariant expressions for various cosmological probes. With the inclusion of relativistic effects and the vector and tensor contributions, this study comprehensively investigates these probes in a non-flat universe, which will be crucial for constraining spatial curvature in future large-scale surveys.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Roy Maartens, Sheean Jolicoeur, Obinna Umeh, Eline M. De Weerd, Chris Clarkson
Summary: Next-generation galaxy and 21cm intensity mapping surveys will rely on high-precision measurements of primordial non-Gaussianity using a combination of power spectrum and bispectrum. Theoretical precision at the same level is essential for these measurements. Incorporating a consistent general relativistic model of galaxy bias at second order extends the theoretical understanding of the galaxy bispectrum. The influence of primordial non-Gaussianity on the bispectrum goes beyond galaxy bias and dark matter density, and includes effects from redshift-space distortions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
D. Zurcher, J. Fluri, V Ajani, S. Fischbacher, A. Refregier, T. Kacprzak
Summary: The next generation of weak lensing surveys will enable us to measure the matter distribution of the local universe with unprecedented precision, which opens up the possibility to resolve non-Gaussian features of the convergence field. We extend the methodology introduced in a previous forecast paper to match these new requirements and provide forecasts for the constraints on the $w$CDM parameters from stage 3 and 4 weak lensing surveys. Our results show that the combination of different summary statistics, including the angular power spectrum, peak counts, and Minkowski functionals following Starlet filtering, significantly improves the constraints on cosmology.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ryu Makiya, Tomomi Sunayama
Summary: This study examines the impact of fiber assignment on galaxy clustering measurements and its cross correlation with weak lensing fields. It is found that fiber assignment not only suppresses the amplitude of the galaxy power spectrum, but also introduces artificial correlation of structures at different redshifts, thereby suppressing the amplitude of the galaxy-lensing cross power spectrum. The effects of fiber assignment on the cross power spectrum can be mitigated by assigning observed galaxies with a probability to be observed, while the correction for the galaxy power spectrum remains challenging.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Ryu Makiya, Tomomi Sunayama
Summary: This study examines the impact of fiber assignment on galaxy clustering and its cross correlation with weak lensing fields. The results show that fiber assignment not only suppresses the amplitude of the galaxy power spectrum, but also introduces artificial correlation of structure at different redshifts, leading to a decrease in the amplitude of the galaxy-lensing cross power spectrum. However, by adjusting the observed galaxy probabilities, the effects of fiber assignment on the cross power spectrum can be mitigated to an accuracy of approximately 1%, while the galaxy power spectrum cannot be fully corrected.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Zhuowen Zhang, Hao-Yi Wu, Yuanyuan Zhang, Joshua Frieman, Chun-Hao To, Joseph DeRose, Matteo Costanzi, Risa H. Wechsler, Susmita Adhikari, Eli Rykoff, Tesla Jeltema, August Evrard, Eduardo Rozo
Summary: Counts of galaxy clusters provide precise insight into cosmology, with control of systematic errors being crucial for accurate measurements. Using simulations, this study analyzes the triaxiality distribution of clusters identified by the redMaPPer algorithm, revealing a bias towards clusters aligned with the line of sight. Additionally, the study uncovers a bottleneck-shaped profile in the weak lensing shear measurement of cluster-associated dark haloes. The findings highlight the importance of triaxiality bias in cluster cosmology, but also indicate that it does not entirely resolve the tension between different probes in low-richness measurements.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Nicola Bartolo, Giovanni Battista Carollo, Sabino Matarrese, Luigi Pilo, Rocco Rollo
Summary: “We analyze the physical content of squeezed bispectra involving long-wavelength tensor perturbations and show that these modes cannot be gauged away, except in the unphysical limit of infinite wavelength, k = 0. This result has a direct implication on the validity of the Maldacena consistency relation, which is respected by a subclass of inflationary models. Consequently, future experiments can observe squeezed mixed correlators in the squeezed limit, similar to the scalar-scalar-scalar bispectrum, and they remain a key channel to study Early Universe physics and discriminate among different models of inflation.”
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Prat, G. Zacharegkas, Y. Park, N. MacCrann, E. R. Switzer, S. Pandey, C. Chang, J. Blazek, R. Miquel, A. Alarcon, O. Alves, A. Amon, F. Andrade-Oliveira, K. Bechtol, M. R. Becker, G. M. Bernstein, R. Chen, A. Choi, H. Camacho, A. Campos, A. Carnero Rosell, M. Carrasco Kind, R. Cawthon, J. Cordero, M. Crocce, C. Davis, J. DeRose, H. T. Diehl, S. Dodelson, C. Doux, A. Drlica-Wagner, K. Eckert, T. F. Eifler, J. Elvin-Poole, S. Everett, X. Fang, A. Ferte, P. Fosalba, O. Friedrich, M. Gatti, G. Giannini, D. Gruen, R. A. Gruendl, I Harrison, W. G. Hartley, K. Herner, H. Huang, E. M. Huff, M. Jarvis, E. Krause, N. Kuropatkin, P-F Leget, J. McCullough, J. Myles, A. Navarro-Alsina, A. Porredon, M. Raveri, R. P. Rollins, A. Roodman, R. Rosenfeld, A. J. Ross, E. S. Rykoff, C. Sanchez, J. Sanchez, L. F. Secco, I Sevilla-Noarbe, E. Sheldon, T. Shin, M. A. Troxel, I Tutusaus, T. N. Varga, B. Yanny, B. Yin, Y. Zhang, J. Zuntz, M. Aguena, S. Allam, J. Annis, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, D. L. Burke, J. Carretero, M. Costanzi, M. E. S. Pereira, J. De Vicente, S. Desai, I Ferrero, B. Flaugher, D. W. Gerdes, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, M. Lima, F. Menanteau, J. Mena-Fernandez, A. Palmese, M. Paterno, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, M. Rodriguez-Monroy, E. Sanchez, M. Schubnell, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, C. To, N. Weaverdyck, J. Weller
Summary: Recent cosmological analyses had to discard signal to noise from small scales due to difficulties in modeling non-linearities and baryonic effects. Efforts to mitigate the non-locality of the galaxy-galaxy lensing signal have shown promising results, yielding cosmological constraints similar to applying larger scale cuts. These methods, including the Y-transformation, point-mass marginalization, and annular differential surface density statistic, have been compared in a combined galaxy clustering and galaxy-galaxy lensing analysis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Giuseppe Fanizza, Enea Di Dio, Ruth Durrer, Giovanni Marozzi
Summary: This paper computes the weak lensing Jacobi map at first order in perturbation theory and demonstrates its gauge invariance and symmetry. It is shown that linear perturbations do not induce any rotation, but vector and tensor perturbations do induce B-modes in the shear. Contrary to previous claims, the shear B-mode power spectrum is not fully determined by the rotation power spectrum, and the E-mode shear power spectrum is not determined by the convergence power spectrum. While this difference is small for scalar perturbations, it becomes significant for tensor perturbations, i.e. gravitational waves.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Kazuhiro Kogai, Takahiko Matsubara, Atsushi J. Nishizawa, Yuko Urakawa
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Naoya Kitajima, Jiro Soda, Yuko Urakawa
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Shun Arai, Sergey Sibiryakov, Yuko Urakaw
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Hayato Fukunaga, Naoya Kitajima, Yuko Urakawa
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Teerthal Patel, Hiroyuki Tashiro, Yuko Urakawa
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Multidisciplinary
Naoya Kitajima, Jiro Soda, Yuko Urakawa
Summary: The study reveals that the spectrum of the stochastic gravitational-wave background from U(1) gauge fields produced by axion dark matter can be accurately calculated using numerical lattice simulations to track nonlinear dynamics, predicting a circularly polarized gravitational-wave signature and having the potential to explain NANOGrav 12.5 yr data.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Aritra Basu, Jishnu Goswami, Dominik J. Schwarz, Yuko Urakawa
Summary: In this study, strong gravitational lens systems are utilized as effective tools for investigating axionlike particles (ALPs) as a candidate for dark matter. By measuring the interaction of photons with ALPs through birefringence, systematics and astrophysical dependencies can be alleviated. Applying this novel method to the lens system CLASS B1152 + 199, constraints on the ALP-photon coupling have been determined, with potential for improvement through a larger sample size.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Takahiro Tanaka, Yuko Urakawa
Summary: The separate universe approach reinterprets an inhomogeneous universe as a set of glued numerous homogeneous local patches, essential for solving long wavelength evolution. The approach can be generically used as long as the theory is local and preserves spatial diffeomorphism invariance. It is applicable to models with shear on large scales, modified theories of gravity, and allows the calculation of large scale fluctuations, including gravitational waves.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Naoya Kitajima, Kazuhiro Kogai, Yuko Urakawa
Summary: The study focuses on the impact of the direct interaction between the QCD axion and QCD matters on the evolution of the axion. Two scenarios are proposed, which may lead to the formation of axion miniclusters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Sunghoon Jung, TaeHun Kim, Jiro Soda, Yuko Urakawa
Article
Astronomy & Astrophysics
Kazuhiro Kogai, Yuichiro Tada