Conveners
Large scale sctructure II
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Large scale sctructure II
- Bruno Moraes (Centro Brasileiro de Pesquisas Físicas)
- Nelson Pinto Neto (Brazilian Center for Physics Research)
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Julian Bautista (Aix-Marseille Univ - CPPM), Julian Bautista (Aix-Marseille Univ - CPPM)12/09/2026, 09:30Oral Talk
Peculiar velocities are a great probe of gravity allowing us to test the validity of general relativity on cosmic scales. I will describe the latest measurement of the growth rate of structures at redshift z = 0.07 using a combination of galaxy positions and direct peculiar velocities from the DESI Peculiar Velocity survey. Our measurements significantly contribute to constraining cosmological...
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Noah Sailer (Stanford University)12/09/2026, 10:30Oral Talk
Large-scale galaxy clustering provides a powerful probe of local primordial non-Gaussianity (PNG) through the scale-dependent bias it induces. On ultra-large scales the plane-parallel approximation is no longer valid, complicating both the interpretation of power spectrum measurements and the structure of the optimal estimator. I will present an optimal estimator that exactly accounts for...
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Sandro Dias Pinto Vitenti (Universidade Estadual de Londrina)12/09/2026, 10:45Oral Talk
Two-point correlation functions are among the most powerful probes of cosmology. Additional information is obtained from cross-correlations, which help mitigate systematic effects and break parameter degeneracies. Their numerical evaluation, however, is computationally demanding because it requires multi-dimensional integrations of highly oscillatory functions involving probe kernels and...
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Dr Lilianne Nakazono (ON, Brazil), Lilianne Nakazono (ON/MCTI)12/09/2026, 11:00Oral Talk
This talk presents a research project centered on the construction and scientific exploitation of the galaxy and quasar catalogs in J-PAS and S-PLUS surveys. Building upon expertise developed within the S-PLUS survey, this project utilizes Machine Learning (ML) techniques - such as Bayesian Neural Networks, FlexCoDE, and foundation models - to enhance classification and photometric redshift...
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Giulia DEGNI (CPPM - AMU)12/09/2026, 11:15Oral Talk
Cosmic voids, the vast, underdense regions of the Universe, are emerging as powerful cosmological laboratories. Far from being empty, they carry unique imprints of the growth of structure and the underlying physics driving cosmic acceleration. Among the most promising observables in this context is the void-galaxy cross-correlation function, which encodes both the geometry and dynamics of the...
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Pauline VIELZEUF (cppm)12/09/2026, 11:30Oral Talk
In this talk, I will present a measurement of the intrinsic alignment (IA) signal of galaxies around cosmic voids using the Euclid-like Flagship simulation from the Euclid Collaboration. While IA has been extensively studied in overdense environments, its behaviour in underdense regions remains largely unexplored and may represent a systematic for future void–lensing analyses. We analyse red...
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Katayoon GHAEMI (CPPM)12/09/2026, 11:45Oral Talk
Cosmic voids provide a novel probe of structure formation and cosmic expansion. They are sensitive to structure growth, dark energy, modified gravity, and sum of neutrino masses. Using the DESI spectroscopic data, we perform void identification and present the preliminary measurements of the void-galaxy cross-correlation function. By measuring the void-galaxy cross correlation function we can...
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