This investigation aims to test the validity of general relativity (GR) on kiloparsec scales via galaxy-scale strong gravitational lensing (SGL) combined with multiple cosmological probes. To circumvent the circularity problem induced by the presumption of a cosmological model based on GR, we apply the distance sum rule in the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric to constrain the post-Newtonian paramete…
Abstract As a new probe, weak lensing (WL) peak steepness statistics are sensitive to the density profile of halos, which encodes important information about baryonic feedback and dark matter properties, leading to a promising means to statistically constrain these effects using WL data. In this article, we present its first application to Hyper Suprime-Cam Year 1 data to demonstrate the great potential of these new…
Abstract We explore the joint probe on the baryonic feedback effect using the weak-lensing measurement from the upcoming Chinese Space Station Survey Telescope (CSST) photometric survey and the dispersion measure (DM) statistics of the fast radio bursts (FRBs) from next-generation radio telescopes, i.e., the Square Kilometre Array (SKA) and the Deep Synoptic Array 2000 (DSA-2000). By employing the baryonic halo mode…
Galaxy clusters are the most powerful strong lenses; they greatly magnify the flux of distant and faint sources. Strong lensing also allows for the reconstruction of their mass distribution with sim1% accuracy and enables the investigation of cosmological parameters. The number of known systems of this type is bound to increase in the coming years thanks to wide imaging surveys. Using simulations in this context is…
L. Leuzzi, Massimo Meneghetti, Alexandre Adam, Lauro Moscardini, C. Giocoli, P. Bergamini, Yashar Hezaveh, Matteo Maturi, Amata Mercurio, A. Moretti, A. A. Plazas, Rosati P
The Euclid mission has been designed to provide, as one of its main deliverables, information on the nature of the gravitational interaction, which determines the expansion of the Universe and the formation of structures. Thus, Euclid has the potential to test deviations from general relativity that will allow us to shed light on long-lasting problems in the standard cosmological Λ cold dark matter model, łcdm. Eucl…
Noemi Frusciante, M. Martinelli, Lucas Lombriser, A. Silvestri, Maria Archidiacono, Marco Baldi, M. Ballardini, N.Bartolo, Emilio Bellini, Giampaolo Benevento, D. Bertacca, C. Bonvin, et al.
We present a GPU-accelerated, PyTorch tensor-based simulation framework designed to generate high-fidelity galaxy–galaxy strong lensing (GGSL) images. By integrating synthetic spectral energy distributions (SEDs), the pipeline accurately models the redshift-dependent photometric properties of lens and source galaxies, ensuring physical consistency across multi-band observations. The framework incorporates key observ…
The effects of weak gravitational lensing induced by clusters of galaxies makes it possible to constrain their dark matter distribution. In general mass estimates from weak lensing are made by compressing the two-dimensional shear-field into one-dimension. In this work we build a forward model of the two-dimensional reduced-shear field around a galaxy cluster, including the non-Gaussian correlated large-scale struct…
Context. In wide-field surveys, the main challenge is not just classifier sensitivity, but the overwhelming number of false positives. Searching for strong lenses among millions to bilions of galaxies produces many contaminants, making the bottleneck for follow-up inspection and building statistically useful lens samples. Aims. We aim to improve the purity of strong-lens candidate selection in KiDS DR4 by combining…
Weak gravitational lensing offers a powerful way to detect galaxy clusters by directly tracing their total matter content. Its effectiveness increases with the density of background galaxies, a requirement that is now being met by the high sensitivity and wide coverage of current large-area surveys. A prime example is the Euclid telescope, which will map approximately 14 000 deg2 of the sky, measuring the shapes of…
A. Manjón-García, G. Leroy, S. Pires, J. M. Diego, C. Giocoli, L. Trobbiani, A. Díaz-Sánchez, M. Maturi, Masamune Oguri, G. Panebianco, G.W Pratt, S. Andreon, et al.
