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Anna Porredon (CIEMAT)28/10/2025 14:00
The inferred cosmological information is most robust when multiple probes are combined. Two of the most sensitive probes of the large-scale structure of the universe are galaxy clustering and weak lensing. I will present new cosmological results combining those two probes (in a so-called 3x2pt analysis) using DESI DR1 spectroscopic data for the galaxy clustering and weak lensing data from the...
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Giulio Fabbian (Institut d'Astrophysique Spatiale (IAS))28/10/2025 14:40
Cosmology is entering a new high precision era with the beginning of the operations of next generation ground-based CMB experiments (Simons Observatory, SPT) and galaxy surveys (Euclid, Rubin, DESI). These experiments will deliver high-sensitivity data sets on large sky fractions and will enable us to constrain cosmology and astrophysics on all scales.
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In this talk I will focus on how galaxy... -
Julien Lesgourgues (EPFL)28/10/2025 15:20
CLASS offers a powerful framework to compute cross-correlation C_l spectra. I will review what is already implemented. Also, to give a feeling of how one should proceed to implement more cross-correlations, I will review the general structure leading to the calculation of all C_l's. I will also mention how the Limber approximation is implemented inside CLASS. Finally, I will mention how the...
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Dr Lukas Hergt (IJCLab, IN2P3, CNRS)28/10/2025 16:40
We present a unified assessment of Bayesian Model Comparisons and Cross-Dataset Tension/Consistency for the (still) standard $\Lambda$CDM model and some minimal extensions (curvature $\Omega_K$, sum of neutrino masses $\sum{m_\nu}$, constant $w$ or dynamic $w_0,w_a$ dark energy) in light of data from the cosmic microwave background (CMB), baryon acoustic oscillations (BAO), and supernovae...
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Dr Tianyi Yang28/10/2025 17:20
Secondary anisotropies in the cosmic microwave background (CMB) contain a wealth of cosmological and astrophysical information. However, cleanly separating the individual contributions of the various kinds of anisotropies from each other can be a very challenging task, owing to uncertainties in their spatial, temporal, and spectral dependencies. Realistic mock simulations of the CMB sky are...
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Julien Carron (Université de Genève)29/10/2025 09:00
Gravitational lensing of the CMB is both a interesting probe of large-scale structures in our Universe, as well as an hindrance to constraints on a background of primordial gravitational waves from inflation.
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I’ll start reviewing recent results on CMB lensing, and proceed to discuss prospects on the tensor-to-scalar ratio. In particular, SPT-3G and BICEP (SPO) have collected now enough... -
Isaac Tutusaus (ICE/IRAP)29/10/2025 09:40
After a successful launch in 2023, and the beginning of the scientific survey last year, Euclid has become the first stage IV photometric survey in operations. In addition to all the cosmological probes that can be considered from Euclid's photometric observations, a spectroscopic survey is also being performed, allowing us to add even more probes to a combined analysis from Euclid data alone....
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Eric Armengaud (IRFU - CEA)29/10/2025 11:00
I will present an overview of current cosmological results from the DESI Lyman-alpha forest sample: BAO, a precise Alcock-Paczynski measurement from the 3D full-shape correlations (arxiv:2509.15308), and first measurements of the growth of structures. I will also show first Lya forest measurements using LBG spectra from DESI, instead of quasars (arxiv:2507.21852).
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I will show how the Lya... -
Aurélien Verdier (Ecole Polytechnique Fédérale de Lausanne (EPFL))29/10/2025 11:40
The Cosmology Redshift Survey of the 4-metre Multi-Object Spectroscopic Telescope (4MOST-CRS) will provide the most extensive spectroscopic redshift catalogue of galaxies and quasars over 5700 deg² in the southern hemisphere.
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As targets for the 4MOST-CRS, we present a selection of a sample of Bright Galaxies (BG) and Luminous Red Galaxies (LRG) in the redshift ranges $0.1<z<0.5$ and... -
Dr Marie-Noëlle Célérier (Observatoire de Paris)29/10/2025 14:00
Large carried out, ongoing and future surveys such as Planck, Euclid, DES, DESI, Rubin, ACT, SPT, S4, are all designed to determine the cosmological parameters defined in the framework of the standard LambdaCDM model of Universe. Now, it is becoming widely acknowledged that this model suffers tensions and anomalies which suggest that LambdaCDM is not the last word in cosmology. In a recent...
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Corentin Ravoux (LPC Clermont-Ferrand CNRS/IN2P3)29/10/2025 14:40
Using supernovae of type Ia for inferring the growth rate of structure (fσ8) has seen a significant gain in interest in recent years. In particular, maximizing the potential of fσ8 constraints can be achieved by coupling peculiar velocity estimators with the underlying density field. I will present a recent software called flip (Ravoux et al. 2025, https://arxiv.org/abs/2501.16852), allowing...
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Boris Bolliet (Cambridge)29/10/2025 15:20
SZ signals (clusters, y-map, tSZ/kSZ cross-correlations) are now well detected. Yet, cosmological constraints have been notoriously hard to extract and astrophysical implications difficult to interpret. As we gather huge amounts of new data, these challenges become increasingly more important to tackle. In this talk we will present ongoing efforts in building inference frameworks to bring SZ...
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Edmond Chaussidon (Lawrence Berkeley National Laboratory)29/10/2025 16:40
The kinetic Sunyaev-Zel'dovich (KSZ) effect (Doppler boosting along the line of sight of CMB photons by electrons that have non-zero bulk velocity) induces a non-zero density-density-temperature bispectrum, that can be used to reconstruct the large-scale velocity field using the so-called “kSZ tomography” technique. In this presentation, I will first detail how we can reconstruct the...
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Emmanuel Schaan (SLAC National Accelerator Laboratory)29/10/2025 17:20
Galaxy lensing measurements from surveys like Euclid and the Rubin and Roman observatories contain a wealth of information on the nature of dark matter, dark energy and the neutrino masses. However, on the smallest scales that contain most of the statistical power, our ability to extract this information is limited by our knowledge of the distribution of baryons around galaxy halos. I will...
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Jiakang Han (University of Turin)29/10/2025 18:00
The cosmic infrared background (CIB), emitted by dust heated during star formation, traces the buildup of stars across cosmic time. By separating the CIB contributions from galaxies at different redshifts, we can map the star-formation history.
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In this work, we cross-correlate Planck CIB maps with Euclid galaxy clustering and weak lensing data, using halo-model templates to measure the... -
29/10/2025 20:20
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Blake Sherwin30/10/2025 09:00
One of the most powerful tests of our cosmological model and of new physics is to determine the growth of large-scale structure with time. Motivated by this and by reports of tensions in structure growth and neutrino mass measurements, in the first part of my talk I will show state-of-the-art determinations of cosmic structure growth using CMB gravitational lensing measurements from the...
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Jean-Luc Starck (CosmoStat, CEA Paris-Saclay)30/10/2025 09:40
Euclid and LSST/Rubin will soon deliver unprecedented cosmological datasets.
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Euclid provides exquisite spatial resolution but limited spectral coverage.
LSST/Rubin offers deep, multi-band imaging across wide areas.
For optimal science, these complementary strengths must be combined.
Euclid requires Rubin colors for accurate photometric redshifts.
Rubin, in turn, needs Euclid’s resolution... -
Mlle Tamara Richardson (Donostia International Physics Centre)30/10/2025 11:00
Dark matter haloes are the end product of cosmological structure formation. Produced through the gravitational collapse of initial density perturbations, these objects are considered to be self gravitating and virialised. Nonetheless, standard methods, used to both detect and analyse these structures in simulations, produce objects that are not virialised requiring the inclusion of an...
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Felicitas Keil (IRAP Toulouse)30/10/2025 11:40
To test the consistency of the flat ΛCDM model, we perform a multi-messenger parameter split of the present-day matter density Ω_m into three different regimes. The first regime concerns the geometrical expansion and thus cosmological distances. The second regime is based on the formation and growth of structures in the universe due to gravitational instabilities. As an extension to earlier...
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Marc Betoule (LPNHE)30/10/2025 12:20
The cosmic distance ladder is a combination of overlapping
astronomical methods used to measure distances in the universe,
starting from nearby objects and extending to the farthest visible
distances. In its modern and most precise implementation it combines
parallaxes, two standard candles (Cepheids and Type Ia supernovae),
and BAO standard rulers.This measurement is at the center of...
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Dr Marina Ricci
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