Publications

All Publications

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The list also contains co-authored publications. We also signed many additional publications as builders in DES, SPT, and now Euclid.

Recent Publications Led by Group Members

Multiprobe Cosmology from the Abundance of SPT Clusters and DES Galaxy Clustering and Weak Lensing

Bocquet, Grandis, Krause, To, Bleem, Klein, Mohr, Schrabback et al. (2024) [Link to publication]

Cosmic shear, galaxy clustering, and the abundance of massive halos each probe the large-scale structure of the universe in complementary ways. We present cosmological constraints from the joint analysis of the three probes, building on the latest analyses of the lensing-informed abundance of clusters identified by the South Pole Telescope (SPT) and of the auto- and cross-correlation of galaxy position and weak lensing measurements (3×2pt) in the Dark Energy Survey (DES).

Interacting Dark Sector (ETHOS n=0): Cosmological Constraints from SPT Cluster Abundance with DES and HST Weak Lensing Data

Mazoun, Bocquet, Mohr et al. (2024) [Link to publication]

We use galaxy cluster abundance measurements from the South Pole Telescope (SPT) enhanced by Multi-Component Matched Filter (MCMF) confirmation and complemented with mass information obtained using weak-lensing data from Dark Energy Survey Year~3 (DES Y3) and targeted Hubble Space Telescope (HST) observations for probing deviations from the cold dark matter paradigm. Concretely, we consider a class of dark sector models featuring interactions between dark matter (DM) and a dark radiation (DR) component within the framework of the Effective Theory of Structure Formation (ETHOS).

Constraints on f(R) gravity from tSZE-selected SPT galaxy clusters and weak lensing mass calibration from DES and HST

Vogt, Bocquet, Davies, Mohr, Schmidt et al. (2024) [Link to publication]

We present constraints on the f(R) gravity model using a sample of 1,005 galaxy clusters in the redshift range 0.25−1.78 that have been selected through the thermal Sunyaev-Zel'dovich effect (tSZE) from South Pole Telescope (SPT) data and subjected to optical and near-infrared confirmation with the Multi-component Matched Filter (MCMF) algorithm. We employ weak gravitational lensing mass calibration from the Dark Energy Survey (DES) Year 3 data for 688 clusters at z<0.95 and from the Hubble Space Telescope (HST) for 39 clusters with 0.6<z<1.7. Our cluster sample is a powerful probe of f(R) gravity, because this model predicts a scale-dependent enhancement in the growth of structure, which impacts the halo mass function (HMF) at cluster mass scales.

The ACT-DR5 MCMF galaxy cluster catalog

Klein, Mohr, Davies (2024) [Link to publication]

We present a new and larger ACT-DR5-based thermal Sunyaev–Zel'dovich Effect- (tSZE-) selected galaxy cluster catalog with improved control over sample purity and completeness. We employed the red sequence based cluster redshift and confirmation tool MCMF together with optical imaging data from the Legacy Survey DR-10 and infrared data from the WISE satellite to systematically identify true clusters from a new cluster candidate detection run on the ACT-DR5 dataset. The resulting ACT-DR5 MCMF sample contains 6,237 clusters with a residual contamination of 10.7%. This is an increase of 49% compared to the previous ACT-DR5 cluster catalog, making this new catalog the largest tSZE-selected cluster catalog to date. The z_phot>1 subsample contains 703 clusters, three times more than in the previous ACT-DR5 catalog.
Cross-correlating the ACT-DR5 MCMF cluster catalog with ACT-DR6 lensing maps results in a 16.4σ detection of Cosmic Microwave Background (CMB) lensing around the clusters, corresponding to the strongest signal found so far for a galaxy cluster sample. Repeating the measurement for the z > 1 cluster subsample yields a significance of 4.3σ, which is the strongest CMB lensing detection in a z > 1 cluster sample to date.

Galaxy cluster matter profiles: I. Self-similarity and mass calibration

Singh, Mohr, Davies, Bocquet, Grandis, Klein et al. (2024) [Link to publication]

We present a study of the weak lensing matter profiles of 698 South Pole Telescope (SPT) thermal Sunyaev-Zel'dovich effect (tSZE) selected galaxy clusters in the redshift range 0.25<z<0.940.25<z<0.94 that have associated weak gravitational lensing shear profiles from the Dark Energy Survey (DES). When rescaled to account for the mass dependent size and the redshift dependent density, this SPT cluster sample when averaged within bins of redshift and tSZE detection significance shows a lower dispersion in the matter profiles than the unscaled versions.

SPT-SZ MCMF: An extension of the SPT-SZ catalog over the DES region

Klein, Mohr, Bocquet et al. (2024) [Link to publication]

We present an extension to a Sunyaev-Zel'dovich Effect (SZE) selected cluster catalog based on observations from the South Pole Telescope (SPT); this catalog extends to lower signal-to-noise than the previous SPT-SZ catalog and therefore includes lower mass clusters.

Cosmological constraints from abundance, weak-lensing and clustering of galaxy clusters: application to the SDSS

Fumagalli et al. (2024) [Link to publication]

The clustering of galaxy clusters is a powerful cosmological tool, which can help to break degeneracies between parameters when combined with other cosmological observables. We aim to demonstrate its potential in constraining cosmological parameters and scaling relations when combined with cluster counts and weak lensing mass information, using as a case study the redMaPPer cluster catalog derived from the Sloan Digital Sky Survey (SDSS). We extend the analysis of number counts and weak lensing signal performed by Costanzi et al. 2019a, with the addition of the real-space 2-point correlation function.

Constraining modified gravity with weak-lensing peaks

Davies et al. (20024) [Link to publication]

It is well established that maximizing the information extracted from upcoming and ongoing stage-IV weak-lensing surveys requires higher order summary statistics that complement the standard two-point statistics. In this work, we focus on weak-lensing peak statistics to test two popular modified gravity models, f(R)f(R) and nDGP, using the FORGE and BRIDGE weak-lensing simulations, respectively. From these simulations, we measure the peak statistics as a function of both cosmological and modified gravity parameters simultaneously.

SPT Clusters with DES and HST Weak Lensing. II. Cosmological Constraints from the Abundance of Massive Halos

Bocquet, Grandis, Bleem, Klein, Mohr, Schrabback et al. (2024) [Link to publication]

We present cosmological constraints from the abundance of galaxy clusters selected via the thermal Sunyaev-Zel'dovich (SZ) effect in South Pole Telescope (SPT) data with a simultaneous mass calibration using weak gravitational lensing data from the Dark Energy Survey (DES) and the Hubble Space Telescope (HST). The cluster sample is constructed from the combined SPT-SZ, SPTpol ECS, and SPTpol 500d surveys, and comprises 1,005 confirmed clusters in the redshift range 0.25−1.78 over a total sky area of 5,200 deg2. We use DES Year 3 weak-lensing data for 688 clusters with redshifts z<0.95 and HST weak-lensing data for 39 clusters with 0.6<z<1.7. The weak-lensing measurements enable robust mass measurements of sample clusters and allow us to empirically constrain the SZ observable--mass relation.

Constraining f(R) gravity using future galaxy cluster abundance and weak-lensing mass calibration datasets

Vogt, Bocquet, Davies, Mohr, Schmidt (2024) [Link to publication]

We present forecasts for constraints on the Hu & Sawicki f(R) modified gravity model using realistic mock data representative of future cluster and weak lensing surveys. We create mock thermal Sunyaev-Zel'dovich effect selected cluster samples for SPT-3G and CMB-S4 and the corresponding weak gravitational lensing data from next-generation weak-lensing (ngWL) surveys like Euclid and Rubin. We employ a state-of-the-art Bayesian likelihood approach that includes all observational effects and systematic uncertainties to obtain constraints on the f(R) gravity parameter log10|f_R0|.

Probing interacting dark sector models with future weak lensing-informed galaxy cluster abundance constraints from SPT-3G and CMB-S4

Mazoun, Bocquet, Garny, Mohr, Rubira, Vogt (2024) [Link to publication]

We forecast the sensitivity of ongoing and future galaxy cluster abundance measurements to detect deviations from the cold dark matter (CDM) paradigm. Concretely, we consider a class of dark sector models that feature an interaction between dark matter and a dark radiation species (IDM-DR). This setup can be naturally realized by a non-Abelian gauge symmetry and has the potential to explain S8 tensions arising within ΛCDM.