Article
Astronomy & Astrophysics
Mathew S. Madhavacheril, Kendrick M. Smith, Blake D. Sherwin, Sigurd Naess
Summary: The power spectrum of cosmic microwave background (CMB) lensing will be measured with high precision in upcoming surveys, allowing for constraints on neutrino masses and cosmological parameters. A new estimator is proposed in this study that is robust against assumptions made in modeling or simulating instrument noise, providing efficient computation without substantial loss in signal-to-noise ratio. This new method relies on multiple splits of CMB maps with independent instrument noise to improve the accuracy of lensing power spectrum measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(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
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
Alex Krolewski, Simone Ferraro, Martin White
Summary: Recent lensing measurements at low redshifts suggest that the amplitude of lensing in the universe may be lower than predicted by the Lambda CDM model based on Planck CMB data. By analyzing the auto-and cross-correlation signal of unWISE galaxies and Planck CMB lensing maps, cosmological parameters at low redshifts have been inferred, showing tensions with the CMB predictions. The combination of blue, green, and red unWISE samples gives a value of S-8 = 0.784 +/- 0.015, consistent with other low-redshift lensing measurements and in tension with the CMB predictions from Planck.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Rajorshi Sushovan Chandra, Tarun Souradeep
Summary: The study uses an improved deconvolution algorithm to reconstruct the Primordial Power Spectrum from Weak Lensing Power Spectrum, providing an independent method to observe and constrain the spectrum. The Weak Lensing Power Spectrum is cleaner and provides unique features over different K scales compared to the CMB Temperature Power Spectrum.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Sambit K. Giri, Aurel Schneider
Summary: This paper introduces an emulator for baryonic suppression of the matter power spectrum based on a baryonification model with seven free parameters. The emulator can recover the power spectra of hydro-dynamical simulations with sub-percent precision and establish a connection between baryonic suppression, gas, and stellar fractions in haloes. Predictions of deviation from a dark-matter-only power spectrum using measured X-ray gas fractions lead to a constraint on suppression levels at various wave numbers, with a maximum of 20-28% at around k ≈ 7 h/Mpc (68% confidence level).
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Andrina Nicola, Carlos Garcia-Garcia, David Alonso, Jo Dunkley, Pedro G. Ferreira, Anze Slosar, David N. Spergel
Summary: This paper explores the complexities associated with estimating and interpreting shear power spectra, and presents fast and accurate methods to estimate two key quantities needed for their practical usage: noise bias and the Gaussian covariance matrix, fully accounting for survey geometry, with some results applicable to other cosmological probes. The methods are demonstrated using the latest public data releases of Hyper Suprime-Cam and the Dark Energy Survey collaborations, showing the presence of systematics in measurements and the validity of the covariance matrix estimate. The resulting power spectra, covariance matrices, null tests, and associated data necessary for a full cosmological analysis are made publicly available.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Oliver Denton-Turner, Eugene A. Lim
Summary: This study demonstrates the equivalence between the 4th order calculation of weak lensing effects and the lens-lens coupling effects in the Born Approximation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Julien Carron
Summary: This method proposes a way to estimate the response matrices of CMB lensing power spectra estimators to the true sky power in realistic conditions. By using a small number of Gaussian CMB Monte-Carlos and specially designed quadratic estimators (QE), accurate matrices can be obtained with minimal computational effort. It can be used to improve the modeling of CMB lensing band-powers by incorporating some of the non-idealities encountered in CMB lensing reconstruction. The method shows that the residual couplings induced by masking can explain the observed residual multiplicative bias on Planck simulations, eliminating the need for an empirical correction.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
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
Carlos Garcia-Garcia, David Alonso, Pedro G. Ferreira, Boryana Hadzhiyska, Andrina Nicola, Carles Sanchez, Anze Slosar
Summary: This paper introduces a method to quantify and propagate the uncertainties on the source redshift distribution in two different surveys sharing the same calibrating sample. The results show that the uncertainties on the redshift distributions do not significantly affect the final constraints on cosmological parameters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Marilena Loverde, Zachary J. Weiner
Summary: We study the modulation of the standard damping of gravitational waves by free-streaming radiation due to the decoupling (or recoupling) of interactions. We focus on nonstandard neutrino interactions in effect after the decoupling of weak interactions as well as more general scenarios in the early Universe involving other light relics. Finally, we compute the imprint of neutrino interactions on the B-mode polarization of the cosmic microwave background, and we comment on other means to infer the presence of such effects at higher frequencies.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Dongwon Han, Neelima Sehgal, Amanda MacInnis, Alexander van Engelen, Blake D. Sherwin, Mathew S. Madhavacheril, Simone Aiola, Nicholas Battaglia, James A. Beall, Daniel T. Becker, Erminia Calabrese, Steve K. Choi, Omar Darwish, Edward Denison, Mark J. Devlin, Jo Dunkley, Simone Ferraro, Anna E. Fox, Matthew Hasselfield, J. Colin Hill, Gene C. Hilton, Matt Hilton, Renee Hlozek, Johannes Hubmayr, John P. Hughes, Arthur Kosowsky, Jeff Van Lanen, Thibaut Louis, Kavilan Moodley, Sigurd Naess, Toshiya Namikawa, Federico Nati, John P. Nibarger, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Frank J. Qu, Alessandro Schillaci, David N. Spergel, Suzanne Staggs, Emilie Storer, Edward J. Wollack
Summary: The study presents Lambda CDM cosmological parameter constraints obtained from delensed microwave background power spectra, revealing internal consistency within the framework of the standard cosmological model. It also demonstrates that the shift in cosmological parameters between delensed and lensed spectra is predicted to be zero when fitting with the correct model, indicating a consistent gravitational lensing effect on the microwave background.
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
Dominik Zurcher, Janis Fluri, Raphael Sgier, Tomasz Kacprzak, Alexandre Refregier
Summary: The study compared the constraining power of three map-based non-Gaussian statistics with the angular power spectrum in the Omega(m)-sigma(8) plane, finding that non-Gaussian statistics provide tighter constraints. A combination of non-Gaussian statistics and the angular power spectrum increased the constraining power and reduced the error on S8.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
F. Lepori, I Tutusaus, C. Viglione, C. Bonvin, S. Camera, F. J. Castander, R. Durrer, P. Fosalba, G. Jelic-Cizmek, M. Kunz, J. Adamek, S. Casas, M. Martinelli, Z. Sakr, D. Sapone, A. Amara, N. Auricchio, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, V Capobianco, C. Carbone, J. Carretero, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, F. Courbin, A. Da Silva, H. Degaudenzi, M. Douspis, F. Dubath, X. Dupac, S. Dusini, A. Ealet, S. Farrens, S. Ferriol, E. Franceschi, M. Fumana, B. Garilli, W. Gillard, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, W. Holmes, F. Hormuth, P. Hudelot, K. Jahnke, S. Kermiche, A. Kiessling, M. Kilbinger, T. Kitching, M. Kuemmel, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I Lloro, O. Mansutti, O. Marggraf, K. Markovic, F. Marulli, R. Massey, S. Maurogordato, M. Melchior, M. Meneghetti, E. Merlin, G. Meylan, M. Moresco, L. Moscardini, E. Munari, R. Nakajima, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V Pettorino, S. Pires, M. Poncet, L. Popa, L. Pozzetti, F. Raison, J. Rhodes, M. Roncarelli, E. Rossetti, R. Saglia, P. Schneider, A. Secroun, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, L. Stanco, J-L Starck, 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, S. Bardelli, G. Fabbian, J. Gracia-Carpio, D. Maino, E. Medinaceli, S. Mei, A. Renzi, E. Romelli, F. Sureau, T. Vassallo, A. Zacchei, E. Zucca, C. Baccigalupi, A. Balaguera-Antolinez, F. Bernardeau, A. Biviano, A. Blanchard, M. Bolzonella, S. Borgani, E. Bozzo, C. Burigana, R. Cabanac, A. Cappi, C. S. Carvalho, G. Castignani, C. Colodro-Conde, J. Coupon, H. M. Courtois, J-G Cuby, S. Davini, S. de la Torre, D. Di Ferdinando, M. Farina, P. G. Ferreira, F. Finelli, S. Galeotta, K. Ganga, J. Garcia-Bellido, E. Gaztanaga, G. Gozaliasl, I. M. Hook, S. Ilic, B. Joachimi, V Kansal, E. Keihanen, C. C. Kirkpatrick, V Lindholm, G. Mainetti, R. Maoli, N. Martinet, M. Maturi, R. B. Metcalf, P. Monaco, G. Morgante, J. Nightingale, A. Nucita, L. Patrizii, V Popa, D. Potter, G. Riccio, A. G. Sanchez, M. Schirmer, M. Schultheis, V Scottez, E. Sefusatti, A. Tramacere, J. Valiviita, M. Viel, H. Hildebrandt
Summary: The study shows that magnification significantly affects the best-fit estimation of cosmological parameters and constraints in the analysis of galaxy clustering in the photometric sample. Neglecting magnification can lead to significant shifts in the best-fit parameters.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Giulia Cusin, Ruth Durrer, Irina Dvorkin
Summary: This paper studies the gravitational lensing of gravitational wave events and introduces a semi-analytic approach to analyze the distribution of magnification for a given source population observed with a specific detector. By computing the expected magnification as a function of redshift and observed source luminosity distance, the study explores the effects of these factors on the magnification. A case study focuses on the LIGO/Virgo network and strong lensing (mu > 1).
Article
Astronomy & Astrophysics
William L. Matthewson, Ruth Durrer
Summary: This paper investigates how small-scale effects influence the angular-redshift power spectrum. It is found that spectroscopic surveys with high redshift resolution are already affected by small-scale features on large angular scales, particularly at low multipoles. Therefore, it is important to consider the non-linearities on small scales when studying the angular power spectrum with spectroscopic redshift resolution, even at low multipoles. The use of the correlation function in relatively wide redshift bins, which is not affected by large-scale non-linearities, may be preferred over the angular power spectrum. The extent to which small-scale effects become visible on large scales is quantified in detail, with a focus on bin auto-correlations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
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
Farbod Hassani, Julian Adamek, Ruth Durrer, Martin Kunz
Summary: This study investigates the impact of tracer selection on the observed signatures of cosmological models beyond ΛCDM, using examples of massive neutrinos and clustering dark energy. The results show that a fixed selection criterion based on local attributes can lead to a loss of signal, while selecting tracers based on fixed bias allows for the recovery of the full signal.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Ruth Durrer
Summary: This paper investigates the possibility of testing Einstein's equations through observations of cosmological large scale structure. The author points out that the equations have not been tested in observations of only the homogeneous and isotropic Universe, and shows with several examples how considering the fluctuations of both the energy momentum tensor and the metric can lead to better results. This is illustrated through examples of galaxy number counts, intensity mapping, and cosmic shear, though these examples are not exhaustive.
GENERAL RELATIVITY AND GRAVITATION
(2022)
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
William L. Matthewson, Dennis Stock, Ruth Durrer
Summary: In this paper, we introduce the concept of "redshift fluctuation" as a gauge-invariant cosmological observable and provide its fully relativistic expression. The angular power spectrum of this variable is analyzed to study the relevance of different relativistic contributions and to compare it with conventional observable galaxy number count fluctuations. Fisher forecasts are performed to investigate the utility of this variable for future spectroscopic surveys, with a focus on the dependence of the results on the size of the redshift bins and the analysis cutoff.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Jeremie Francfort, Ruth Durrer, Giulia Cusin
Summary: This paper introduces a new observable to measure cosmic shear, which is sensitive to the angle between the orientation of a galaxy and the polarization direction of its radio emission. Despite the expected low signal-to-noise ratio for a single measurement, the fact that all galaxies in a given pixel experience the same shear allows to overcome the noise. Another advantage of this method is that the signal is not affected by intrinsic alignment.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Francesca Lepori, Sebastian Schulz, Julian Adamek, Ruth Durrer
Summary: We present for the first time halo number counts and their two-point statistics extracted from relativistic N-body simulations. The halo catalogues are built from the relativistic N-body code gevolution, and the observed positions and redshifts of the sources are computed using a non-perturbative ray-tracing method. We investigate the validity and limitations of linear bias prescription and test a second-order perturbative bias expansion for angular statistics. We also extract the cross-correlation of halo number counts and lensing convergence, finding consistent linear bias estimates and the importance of considering magnification effects.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Bartjan van Tent, Paola C. M. Delgado, Ruth Durrer
Summary: Bouncing models of cosmology, which can explain the large-scale anomalies observed in the cosmic microwave background, generate close-to-scale-invariant fluctuation spectra but are not typically Gaussian and produce a bispectrum. These models can help mitigate the large-scale anomalies by considering substantial non-Gaussianities on very large scales, which decay exponentially on subhorizon scales. However, the Planck data excludes bouncing models with parameters that significantly mitigate the large-scale anomalies with high significance, ranging from 5.4 to 14 standard deviations depending on the specific model.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Charles Dalang, Ruth Durrer, Fabien Lacasa
Summary: The velocity of the Sun with respect to the cosmic microwave background (CMB) can be determined by studying the correlations between neighboring CMB multipoles induced by the observer's velocity. However, the source number count dipole measurements suggest a larger observer velocity, indicating a significant tension. In this study, we analyze the effect of the observer's peculiar velocity on correlations of nearby multipoles in the source number counts and provide an unbiased estimator for the kinematic dipole amplitude, indicating future experiments can achieve better constraints on the Sun's velocity.
Article
Astronomy & Astrophysics
Ruth Durrer, Serge Parnovsky
Summary: In this paper, a new idea is proposed to explain the formation of galaxies through the infall of baryonic matter and dark matter onto preexisting overdensities. It is proposed that slow dark matter particles can be captured by increasing overdensities while faster particles transfer their energy to the galaxy. The capture rate of dark matter is found to be dependent on the density of intergalactic dark matter.
Review
Mathematics, Applied
Nunzio Dimola, Alessandro Coclite, Giuseppe Fanizza, Tiziano Politi
Summary: Peridynamic (PD) theories, especially the bond-based peridynamics (BB-PD), have been widely used in various research areas due to their ability to model discontinuity formation and evolution in materials. In this paper, the authors review and investigate several aspects of bond-based peridynamic models, including the theory, applications, numerical models, integral kernels, mathematical structure, and their impact on crack formation prediction. The authors also propose the idea of extending the BB-PD to fluids, providing perspectives for a deeper understanding of peridynamics in fluids.
ADVANCES IN CONTINUOUS AND DISCRETE MODELS
(2022)
Correction
Astronomy & Astrophysics
Jennifer Schober, Tomohiro Fujita, Ruth Durrer
