Cosmic Rhythms

Session

Large scale sctructure III

12 Sept 2026, 09:00

Auditório Ministro João Alberto Lins e Barros (CBPF)

70. Environmental dependent clustering in modified gravity simulations

Joaquin Armijo (IFUSP)

12/09/2026, 09:00

Oral Talk

I'll showcase the study of environment-dependent clustering using the marked correlation function applied to Hu-Sawicki $f(R)$ modified gravity simulations. This gravity theory enriches the structure formation by enhancing gravity in a scale-dependent form. By employing a multi-scale cosmic structure finder algorithm, we define the cosmic environments divided in: nodes, filaments, walls and...

87. Cosmology with Galaxys and Quasars in narrow-band large-sky surveys

Dr Lilianne Nakazono (ON, Brazil), Lilianne Nakazono (ON/MCTI)

12/09/2026, 09:15

Oral 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...

34. Detection of cosmological dipoles aligned with transverse velocities

Yan-Chuan Cai (University of Edinburgh)

12/09/2026, 09:30

Oral Talk

On large scales, peculiar velocities encode a wealth of cosmological information. While line-of-sight components are routinely probed through redshift-space distortions and the kinetic Sunyaev–Zel’dovich effect, measuring transverse velocities has remained challenging. I will present a detection of dipolar patterns on angular scales of tens of degrees imprinted on the Cosmic Microwave...

80. UltraLevin: A NumCosmo Algorithm for Efficient Non-Limber Angular Power Spectrum Computation

Sandro Dias Pinto Vitenti (Universidade Estadual de Londrina)

12/09/2026, 09:45

Oral 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...

51. Intrinsic Alignments Around Cosmic Voids: Insights from the Euclid Flagship Simulation

Pauline VIELZEUF (cppm)

12/09/2026, 14:00

Oral 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...

11. The shape of emptiness: improving the signal from cosmic voids using reconstruction

Giulia DEGNI (CPPM - AMU)

12/09/2026, 14:15

Oral 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...

5. How to measure cosmology from nothing: void-galaxy cross-correlation with DESI

Katayoon GHAEMI (CPPM)

12/09/2026, 14:30

Oral 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...

13. Measuring cosmic bulk flow with kinetic Sunyaev-Zel'dovich (kSZ) velocity reconstruction

Suroor Seher Gandhi (Perimeter Institute for Theoretical Physics)

12/09/2026, 14:45

Oral Talk

The average large-scale velocity of matter in the universe, known as bulk flow, is a fundamental test of the Cosmological Principle. Traditionally, this has been measured only out to $R\lesssim 100$ megaparsecs (Mpc). We present an application of kinetic Sunyaev-Zel'dovich (kSZ) velocity reconstruction to constrain bulk flow on cosmological scales more than $10\times$ larger, extending...