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Andrea Pari (University of Cambridge)Poster + Fireslide
The cosmological bispectrum is a powerful probe of non-Gaussianity, sensitive to both nonlinear structure formation and primordial physics from inflation. However, measuring the bispectrum in large-scale structure surveys is computationally challenging due to its high dimensionality and observational effects.
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In this talk I present ongoing work extending the MODAL bispectrum estimator to... -
Dr Matheus Rodrigues Medeiros SilvaPoster + Fireslide
In this talk, we present a novel framework to compute gauge-invariant cosmological observables, such as the luminosity distance–redshift relation, the redshift drift, and the relation between galaxy number counts and luminosity distance. Our approach is based on constructing first- and second-order perturbations around a homogeneous and isotropic background within geodesic light-cone (GLC)...
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Francisco Germano MaionOral Talk
We present a new analysis of the IllustrisTNG galaxy formation model based on a set of simultaneous multi-zoom hydrodynamical simulations of halos embedded within a common cosmological volume. This framework allows us to efficiently probe galaxy populations across a wide range of masses and environments while maintaining full cosmological context. We compare predictions for the galaxy stellar...
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Gabriel Hoerning (The University of Manchester)Oral Talk
We present a new all-sky model of low-frequency diffuse Galactic emission designed to support high-precision CMB analyses. The model describes the regime where synchrotron, free–free, and spinning dust emission dominate and extends the Planck 2015 diffuse component-separation framework by incorporating a wide set of modern radio and microwave surveys. In total, we jointly fit 35 full- and...
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Miguel Quartin (Centro Brasileiro de Pesquisas Físicas)Oral Talk
The current spectroscopic surveys DESI and Euclid are enabling a very precise measurement of the matter power spectrum and bispectrum on a vast range of scales. I will discuss how we can improve accuracy by using the FreePower methodology, which analyzes the mildly non-linear scales of the LSS data without the need to make any model assumptions on the physics of recombination or the nature of...
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Andy Nilipour Nilipour (University of Cambridge, Harvard University)Poster + Fireslide
Component separation is a foundational challenge in extracting cosmological signals from multi-frequency CMB observations. Standard Internal Linear Combination (ILC) methods provide a powerful and well-understood framework for isolating signals of interest, such as the thermal Sunyaev-Zel'dovich (tSZ) effect, while suppressing foreground contamination. However, ILC performs linear observations...
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Michael Kovac (University of Manchester)Oral Talk
Understanding the impact of baryonic feedback on the matter distribution is a major challenge for precision cosmology, especially for analyses combining large-scale structure tracers with CMB secondary anisotropies. We recently showed that combining kinematic Sunyaev–Zel’dovich measurements from ACT with gas‑fraction data from eROSITA provides strong constraints on gas thermodynamics in...
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Tiago Batalha de Castro (USP)Oral Talk
Galaxy clusters are the most massive gravitationally bound objects in the Universe, and their abundance and spatial distribution make them powerful probes of cosmology. Extracting this information from upcoming surveys such as Euclid, however, requires theoretical predictions that are accurate enough to match the quality of the data. In this seminar, I will present recent work within the...
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Kai Lehman (LMU Munich / CCA)Poster + Fireslide
Cosmological analyses are moving past the well understood 2-point statistics to extract more information from cosmological fields. A natural step in extending inference pipelines to other summary statistics is to include higher order N-point correlation functions (NPCFs), which are computationally expensive and difficult to model. At the same time it is unclear how many NPCFs one would have to...
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Shivam Pandey (University of Arizona)Oral Talk
Future weak lensing surveys are poised to deliver unprecedented cosmological constraints, but their statistical power on small scales is fundamentally limited by systematic uncertainties in baryonic feedback. This feedback alters the total matter power spectrum in a way that is degenerate with key cosmological parameters. We introduce a self-consistent halo model that leverages the kinetic...
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Lea Harscouet (Oxford University)Oral Talk
The traditional, real-space stacking estimator for the kinematic Sunyaev Zeldovich (kSZ) effect can be expressed as a simple angular power spectrum of two quantities: the CMB temperature field, and the galaxy momentum field. This power spectrum approach is mathematically equivalent to the stacking estimator, and comes with a number of advantages: it is fast to compute, easily connected to...
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Francesco Verdiani (SISSA, Trieste)Oral Talk
In several cosmological scenarios, such as massive neutrinos or ultra-light axions, the dark matter comprises a warm component alongside the cold one. This modifies the late-time evolution of the dark sector, thus making galaxy clustering an ideal probe of these models. We study the non-linear evolution of perturbations in this context, and build an EFTofLSS-based model that allows for a...
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Joseph Thornton (University of Cambridge)Poster + Fireslide
The Cosmic Infrared Background (CIB) is sourced by dusty star-forming galaxies, and is thus a biased tracer of large-scale structure. This makes it a promising probe of local-type primordial non-Gaussianity (PNG) through the scale-dependent bias effect that arises in the presence of non-zero local PNG. Tight constraints on the local PNG parameter fNL can help distinguish between different...
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Camila Novaes (Instituto Nacional de Pesquisas Espaciais)Oral Talk
Intensity mapping (IM) of the redshifted 21 cm line emission from neutral hydrogen is an efficient technique for surveying the large-scale structure of the Universe. In this talk, I discuss cosmological and astrophysical aspects of 21 cm IM, addressing instrumental limitations that affect clustering measurements, the role of cross-correlations between radio and photometric galaxy surveys, and...
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Mr Leonam Barradas Coelho (OV)Poster + Fireslide
The galaxy power spectrum is a powerful probe of the large-scale structure of the universe and allows us to obtain constraints for many cosmological parameters. However, standard analyses assume a cosmological model to define the theoretical linear power spectrum shape, which makes the analysis model dependent. The recently proposed FreePower method seeks to produce model independent analyses...
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Gerrit Farren (Lawrence Berkeley National Laboratory)Oral Talk
I will present cosmological results obtained from the cross-correlation of DESI DR2 spectroscopic galaxies with CMB lensing reconstructions from ACT and Planck. This combination of galaxy surveys and CMB lensing provides powerful, percent level constraints on the growth of structure over a wide range of redshifts from $z=0.1$ to $z=2.1$. We further extend the redshift coverage of our analysis...
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Prof. Shahab Joudaki (CIEMAT, Spain)Oral Talk
I will provide a description of the code implementation and structure of Cosmology Likelihood for Observables in Euclid (CLOE), developed by members of the Euclid Consortium. CLOE is a modular Python code for computing the theoretical predictions of cosmological observables and evaluating them against state-of-the-art data from galaxy surveys such as Euclid in a unified likelihood. This...
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Dr Lilianne Nakazono (ON, Brazil)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...
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Sarah FERRAIUOLO (AMY&Sapienza)Oral Talk
We present a study aimed at using the galaxy catalog released by Euclid for Gravitational-wave (GW) cosmology. I will firstly present an overview of the galaxy catalogs released and planned to be released with Euclid, focusing on their overlap with current GW detections. We identified six candidate events with significant spatial overlap with Euclid. I then focus on presenting the...
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Tatiane de Paula Moraes (Federal University of Espirito Santo)Poster + Fireslide
A decade after the first gravitational-wave detection, the field has rapidly expanded, opening new opportunities to address key cosmological problems such as the Hubble tension and the study of large-scale structure. As the number of detections continues to increase, the development of robust and efficient computational tools has become essential. In this work, we focus on dark siren...
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Ningyuan (Lillian) Guo (Royal Holloway, University of London)Oral Talk
The abundance of dark matter halos is a key cosmological probe in forthcoming surveys. Placing tight constraints requires modelling the halo mass function to at least percent-level accuracy over a wide cosmological parameter space. However, a theoretical understanding of what is required for such accurate modelling is incomplete, limiting the generalisability of existing halo mass function...
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Guilherme de Souza Fernandes (IFT-Unesp)Poster + Fireslide
We present cosmological constraints from the joint analysis of galaxy clustering and weak gravitational lensing ($3 \times 2$ pt) using the Dark Energy Survey Year 6 (DES Y6) data in harmonic space. In a nutshell, cosmological $3 \times 2$ point analysis is the joint analysis of $3$ 2-point correlation functions, galaxy clustering, galaxy-galaxy lensing and cosmic shear. This analysis utilizes...
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Isabela Santiago de Matos (University of Portsmouth)Oral Talk
Gravitational waves (GWs) are emerging as a potentially powerful probe of the Universe on large scales. Notably, they may contribute in the coming years to addressing the Hubble tension, as both the number of observed GW events increases and the capacity of current detectors to localise their sources improves. In this talk, I will discuss a new method for measuring the Hubble constant using...
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Yan-Chuan Cai (University of Edinburgh)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...
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Neelima SehgalOral Talk
CMB experiments have contributed powerful constraints on the fundamental physics and astrophysics of the Universe. Current CMB experiments, such as the Simons Observatory, are poised to extend this progress even further. However, CMB experiments still have a wealth of information to offer beyond near-term facilities, including probing the properties of dark matter, inflation, and light relic...
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Kaynan Pompeu (IFT - Unesp)Poster + Fireslide
Recent data has pointed out that dark energy may not be consistent with a cosmological constant. Combined datasets increasingly indicate that its equation of state may exhibit dynamical behavior, potentially crossing the “phantom divide” ($w < -1$) at low redshifts. This feature has been discussed as one possible aspect of the so-called BAO tension and is difficult to reproduce within simple...
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Ivan Sladoljev (Royal Holloway)Oral Talk
In this talk I will present an overview of current cosmological emulator development efforts in Euclid, aimed at enabling efficient and accurate parameter inference in the era of high-precision cosmology. Cosmological emulators are surrogate models trained on high-fidelity theoretical predictions from Boltzmann solvers, or from numerical simulations. Once trained, these models can reproduce...
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Joaquin Armijo (IFUSP)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...
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Ben Sherwin (Stanford University)Poster + Fireslide
Constraining the clustering of high-redshift Lyman-break Galaxies (LBGs) and their cross-correlation with CMB lensing will provide a cosmological probe that is highly complementary with LSST's usual "low-redshift" 3x2pt analysis. To maximize the potential of this measurement, we must understand how photometric redshift uncertainties of LBGs affect cosmological inference. While LSST has...
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Amanda Freitas Cruz (Brazilian Center for Research in Physics (CBPF))Poster + Fireslide
The accelerated expansion of the Universe, commonly attributed to the cosmological constant (Λ) in the framework of General Relativity, remains one of the central open questions in modern physics. A standard approach to probing cosmology with large-scale structure data relies on two-point statistics, which, while powerful, are limited to capturing Gaussian information and thus fail to account...
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Laura Reymond (ETH Zürich)Oral Talk
Simulation-based inference is going to be play a key role in the upcoming cosmological analyses. For this reason, I will present an end-to-end pipeline designed for multi-probe simulation-based inference.
I first present CosmoGridV1, a suite of lightcone simulations for map-level cosmological inference. The simulation suite spans the wCDM model and includes a fiducial cosmology with 200...
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Dr Arthur Loureiro (Stockholm University)Oral Talk
Field-level inference – the direct statistical reconstruction of cosmological fields from observational data – is emerging as a transformative paradigm for next-generation galaxy surveys like Euclid, LSST, and DESI. Unlike traditional summary statistics, this approach infers latent fields (e.g. matter density, weak-lensing, cmb convergence) and their uncertainties directly, leveraging the full...
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João Pedro Bonifácio (Universidade Federal do Rio de Janeiro)Poster + Fireslide
Type Ia Supernovae (SNIa) are fundamental distance indicators for cosmology thanks to their nature as standardizable candles. The Rubin Observatory Legacy Survey of Space and Time will provide a sample of millions of SNIa due to its large sky coverage and high cadence. Apart from the direct measurement of cosmological parameters with traditional methods of SNIa analysis, this sample enables...
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Guanming LiangPoster + Fireslide
Inflation offers a compelling explanation of how the primordial universe evolved into the modern $\Lambda$CDM paradigm. Measuring the non-Gaussianity of primordial density fluctuations will deliver crucial evidence for inflation and insight into its more fundamental mechanism. We forecast future constraints on local primordial non-Gaussianity ($f_{\rm NL}^{\rm loc}$) under the context of...
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Pedro Ribeiro (Universidade Estadual de Londrina)Poster + Fireslide
This work analyzes the expected constraint on the sum of neutrino masses from the Legacy Survey of Space and Time (LSST) $3\times2$pt analyses (galaxy clustering, cosmic shear, and their cross-correlations) with 32 systematic parameters, the impact of these systematic models on the neutrino constraint, and how combining with other probes helps break these degeneracies. We present realistic...
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Maximilian von Wietersheim-Kramsta (Durham University)Oral Talk
How can we accurately test extensions to ΛCDM when unmodelled baryonic dynamics obscure the galaxy-halo connection? While galaxies are vital tracers of large-scale structure, residual uncertainties in their distribution often obstruct cosmological inference, especially in two-dimensional projections where halo-level information is incomplete. I present an analytic galaxy bias model in...
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Laura Salvati (IAS, Paris Saclay)Oral Talk
Recent cosmological observations have revealed increasing tensions between different probes of the Universe. While these discrepancies may hint at physics beyond the standard cosmological model, it is essential to carefully assess the role of astrophysical processes that could bias our interpretation of the data. In particular, understanding how astrophysics influences the late-time evolution...
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Alessandra SilvestriOral Talk
Stage IV Large Scale Structure Surveys are ushering in a new era of precision cosmology!
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In this talk, I will explore the effort to test gravity on cosmological scales, highlighting the theoretical advancements aimed at constructing an optimal framework. I will also touch on the synergy with gravitational wave surveys. Additionally, I will provide a detailed review of recent findings based on... -
Mrs Natalí Soler Matubaro de SantiOral Talk
Galaxies are the primary tracers of the large-scale structure of the Universe and are traditionally used through summary statistics such as correlation functions and power spectra to constrain cosmological models. However, galaxies themselves are complex systems whose spatial distribution, internal properties, and environments may encode additional cosmological information beyond these...
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Katayoon GHAEMI (CPPM)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...
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Lucas Patric Cardoso Leão (Universidade Federal de Minas Gerais)Poster + Fireslide
The $\Lambda$CDM cosmological model faces persistent challenges, most notably the statistically significant discrepancies in the Hubble constant ($H_0$) and the amplitude of matter fluctuations ($S_8$). In this context, we study the cosmological effects of a Bergmann-Wagoner scalar-tensor model with cold dark matter (ST-CDM for short) featuring an oscillatory gravitational strength,...
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Tassia Ferreira (Newcastle University)Poster + Fireslide
In this talk, I will present measurements of the cross-correlation between cosmic shear from the third-year release of the Dark Energy Survey, thermal Sunyaev-Zel'dovich maps from Planck, and X-ray maps from ROSAT. I will discuss the development of a physical model able to jointly describe these measurements while simultaneously constraining the spatial distribution and thermodynamic...
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Mina Ghodsi Yengejeh (Konkoly Observatory)Poster + Fireslide
The late-time linear Integrated Sachs-Wolfe (ISW) effect directly probes the dynamics of cosmic acceleration and the nature of dark energy. By extending the pyGenISW package, previously limited to LCDM, we aim to generate full-sky ISW maps for a suite of 791 wCDM cosmologies using the Gower Street N-body simulations, thereby enabling ISW analyses across a broader dark-energy parameter space....
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Pauline VIELZEUF (cppm)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...
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Ricardo Alexandre Fernandes Filho (Universidade federal do Espírito Santo)Poster + Fireslide
The nature of dark energy and dark matter remains one of the central open problems in modern cosmology. In this context, the Effective Field Theory (EFT) of dark energy provides a general and systematic framework to investigate departures from the standard cosmological model and to describe possible interactions in the dark sector. In this work, we study interacting dark energy scenarios...
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Fiona McCarthyOral Talk
The kinetic Sunyaev--Zel'dovich (kSZ) effect is the dominant small-scale CMB blackbody anisotropy, and is sensitive to the electron density field as well as the large scale velocity field of the Universe. It has recently become possible to measure at high significance over a wide sky area with the Atacama Cosmology Telescope (ACT) data, and will be an even more significant signal in Simons...
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Will CoultonOral Talk
Observations of the millimetre sky contain a wealth of signals from across the history of the Universe. Current observations have reached the sensitivity where we able to make precision measurements of the signals sourced by the large-scale structure of the Universe, known as CMB secondary anisotropies. Optimally analyzing many of these signals is challenging as CMB secondaries are highly...
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Georgia Kiddier (DAMTP, University of Cambridge)Poster + Fireslide
Likelihood-ratio statistics play a central role in assessing detection significance in cosmological analyses. Under regularity conditions, Wilks’ theorem predicts that these statistics follow a $\chi^2$ distribution in the asymptotic limit. When a parameter is restricted to a physical boundary, this result no longer holds, and Chernoff’s theorem provides the corresponding mixed distribution....
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Vicente Pedreros (Universidad de Chile)Poster + Fireslide
Unraveling the nature of the cosmic expansion of the Universe, driven by Dark Energy (DE), remains one of the key challenges in modern cosmology. Modified Gravity (MG) models provide an alternative to the standard paradigm of the cosmological constant. These models predict distinct signatures in the growth of structures, yet analytical predictions are challenging due to the highly non-linear...
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Finn Roper (University of Edinburgh)Oral Talk
We detect the kinetic Sunyaev-Zeldovich imprint of peculiar motions of galaxy groups and clusters, using the photometric DESI Legacy Survey together with cosmic microwave background (CMB) maps from the Atacama Cosmology Telescope (ACT). We develop a comprehensive forward model based on the AbacusSummit cosmological simulations: mock galaxy group catalogues and synthetic kSZ maps are generated,...
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Suroor Seher Gandhi (Perimeter Institute for Theoretical Physics)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...
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João Victor Silva RebouçasTheory & Fundamental PhysicsOral Talk
Hints of dynamical dark energy have recently emerged from distance measurements from type Ia supernovae and galaxies through the Baryonic Acoustic Oscillation feature, challenging the current paradigm in cosmology. This new perspective has encouraged the proposal of physical mechanisms able to consistently explain the observations, such as modified gravity and interactions between dark matter...
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Rodrigo von Marttens (Federal University of Bahia)Oral Talk
Interacting dark sector (IDS) models provide a commonly explored extension of the standard $\Lambda$CDM cosmology, allowing for non-gravitational energy--momentum exchange between cold dark matter (CDM) and dark energy (DE). Although such models can reproduce similar background expansion history as dynamical DE models, their impact on the growth of cosmic structures is fundamentally different...
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Lucca Lopes Dias Santos (Universidade de Brasília)Poster + Fireslide
The dark energy component in the Standard Model of Cosmology accounts for the recent accelerated expansion of the universe. An alternative approach involves geometric modifications to general relativity, leading to modified theories of gravity. When applied to a gravity theory, energy conditions impose constraints on the Ricci and energy-momentum tensors, which translate into inequalities....
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Mr Camilo Crisman (CBPF)Large-scale structureOral Talk
Type Ia supernova magnitudes are correlated due to their peculiar velocities, which are sourced by the large-scale structure of the Universe. This effect provides a way to probe the growth of structures and the distribution of matter, with strong potential in light of upcoming, larger supernova catalogues. In this talk, I analyze the Pantheon+ and DES-Y5 samples in combination with Planck CMB...
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Frank Qu (Stanford)Oral Talk
The gravitational lensing of the Cosmic Microwave Background (CMB) provides a powerful and robust probe of the projected matter distribution across cosmic time, offering unique sensitivity to the growth of large-scale structure, cosmic expansion, and fundamental physics such as the sum of neutrino masses. As cosmology enters a high-precision era, CMB lensing has become a cornerstone observable...
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Caio B. de S. Nascimento (Perimeter Institute)Oral Talk
The presence of additional light fields during inflation can be robustly inferred (or ruled out), if signatures of primordial non-Gaussianity (PNG) of the local type are found (or not found) in upcoming cosmological surveys. In fact, upcoming measurements of the distribution of large-scale structures (LSS) in our Universe will have enough sensitivity to reach important theoretical thresholds...
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Dr Jose Bermejo (Konkoly Observatory)Oral Talk
Measuring the local primordial non-Gaussianity parameter, fNL, is crucial for understanding the nature of inflation, as it can rule out or confirm the various inflationary models. Although the current best constraint on fNL is achieved by the cosmic microwave background (CMB) bispectrum, datasets from large surveys (DESI, Euclid, LSST) are providing this decade another cosmic window to...
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Manon Ramel (University of Cincinnati)Poster + Fireslide
Galaxy clusters are powerful cosmological probes, as their abundance and mass evolution are highly sensitive to the growth of structure. Weak gravitational lensing provides a key mass calibration by measuring the coherent distortion of background galaxy shapes induced by foreground clusters. Achieving accurate lensing mass calibration requires precise measurements of galaxy shapes and...
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Ana Carolina Silva Oliveira (California Institute of Technology)Poster + Fireslide
The thermal Sunyaev-Zeldovich (tSZ) effect and gravitational lensing of the cosmic microwave background (CMB) are powerful and complementary probes of cosmic structure formation: the former traces baryonic gas in galaxy clusters via Compton scattering, while the latter captures gravitational deflection by large-scale structure. Their cross-correlation constrains the relationship between...
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Carmen Embil Villagra (University of Cambridge)Oral Talk
Recent and upcoming CMB experiments are opening a new window onto the late-time Universe by reaching arcminute-scale resolution. These improvements allow us to extract information from CMB secondary anisotropies, which probe the evolution and distribution of structure over most of cosmic history. I will present new constraints on the amplitude of matter fluctuations over a broad redshift...
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Enrique Paillas (University of Arizona)Oral Talk
I will present a pipeline to emulate galaxy clustering statistics at the two-point level and beyond, down to the non-linear regime, including many alternative summary statistics for which no complete analytic models exist in the literature, including the wavelet scattering transform, density-split clustering, Minkowski functionals, void statistics, and more. Our theory models are based on...
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Adrian E. Bayer Not Supplied (Flatiron Institute / Princeton University)Oral Talk
Cosmology is entering an era in which inference can be performed directly from maps and fields, using simulation-based inference (SBI) across both large-scale structure and CMB surveys, offering a way to trace the underlying rhythms of the cosmos across multiple probes and scales.
I will begin by motivating field-level inference as a powerful approach to extracting cosmological information...
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Giovanni AricòOral Talk
Modern cosmological surveys are specifically designed to characterise the dark energy equation of state and dark matter power spectrum, and place tight constraints on the neutrino mass. Unfortunately, a large part of the data is currently discarded because of the lack of robust theoretical modelling on small scales. The main uncertainties are associated with baryonic physics and galaxy...
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Howard Hui (Caltech)Oral Talk
SPHEREx, a satellite in NASA’s Medium Explorer program, was launched in March 2025 and is currently conducting the first all-sky near infrared spectral survey from 0.75 to 5 microns. Using linear variable filters mounted on six H2RG detector arrays, SPHEREx obtains low resolution spectra across the entire sky in 102 spectral channels with a resolving power of about 35 to 130. The mission is...
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Laura de Carvalho (Universidade Federal da Bahia)Poster + Fireslide
The large-scale distribution of matter in the Universe is organized into a complex network known as the cosmic web, where filaments act as the primary bridges for mass transport and connectivity between clusters. This work proposes a characterization of the filamentary network using the Quijote suite of n-body simulations, which allows for the exploration of a wide range of cosmological...
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Louis Legrand (Centro Brasileiro de Pesquisas Fisicas)Oral Talk
Test 3adsaD
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Richard Massey (Durham University)Oral Talk
We combine ESA's Euclid mission and NASA's SuperBIT mission to test the hypothesis that dark matter particles interact with each other, through forces besides gravity. The hypothesis predicts that dark matter’s trajectory through collisions will deviate from the purely gravitational trajectories followed by stars. To test it, we have observed astrophysical versions of dark matter colliders...
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Dr Pablo Fosalba (Institute of Space Sciences (ICE-CSIC, IEEC))Oral Talk
I shall describe the ESA Euclid mission, from its adoption by ESA in 2011 to its current status. I will provide an overview of its capabilites, scientific goals and the coordinated effort undertaken by the collaboration to deliver the upcoming first Data Release (DR1).
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Noah Sailer (Stanford University)Oral Talk
The past decade has seen the rise of high-precision cosmological observations accompanied by emerging tensions among various datasets when interpreted within the standard cosmological model (ΛCDM). Recently, baryonic acoustic oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI) have shown a mild discrepancy with current cosmic microwave background (CMB) data....
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Naomi Robertson (University of Edinburgh)Oral Talk
Achieving robust cosmological constraints from cosmic shear involves several stages and many different analysis choices. Recent galaxy weak lensing analyses (DES & KiDS 2023) have shown that small shifts in parameter constraints are exacerbated by some combinations of analysis choices. As constraining power from cosmic shear improves, more complex modelling and accounting of systematics is...
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Giulia DEGNI (CPPM - AMU)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...
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32. The SPHEREx All-Sky Galaxy Catalog: Probing Primordial Non-Gaussianity and Synergy OpportunitiesYun Ting ChengOral Talk
SPHEREx is a near-infrared satellite mission launched in March 2025, currently conducting the first all-sky near-infrared spectral survey. Its primary cosmological objective is to constrain primordial non-Gaussianity through 3D galaxy clustering, using the all-sky galaxy catalog built from SPHEREx high-resolution photometric spectra. This talk will begin with an overview of the SPHEREx...
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Sara Maleubre (University of Oxford)Oral Talk
The cross-correlation of galaxies at different redshifts with other tracers of the large-scale structure can be used to reconstruct the cosmic mean of key physical quantities and their evolution over billions of years, at high precision. In particular, cross-correlating redshift-sliced galaxy samples with thermal Sunyaev–Zel’dovich (tSZ) and cosmic infrared background (CIB) maps enables...
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Jared Siegel Siegel (Princeton University)Oral Talk
There is no consensus on how baryon feedback shapes the underlying matter distribution from either simulations or observations. We confront the uncertain landscape by jointly analyzing the kinetic and thermal Sunyaev-Zel’dovich (kSZ) effects and X-ray gas mass fractions, each characterized with galaxy-galaxy lensing. Across group and clusters masses and between $0<z<1$, we find consistent...
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Lurdes Ondaro (University of Cambridge, UK)Oral Talk
Recently, velocity-weighted stacked kSZ measurements around galaxy groups have
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become feasible, offering a competitive way to probe the gas distribution around
groups. These new measurements appear to imply very strong baryonic feedback,
somewhat in tension with previous X-ray observations. However, it is still unclear
whether the theoretical modelling used so far is sufficiently detailed... -
Riccardo SturaniPoster + Fireslide
The gravitational two-body problem attracted revived interest since the direct detection of gravitational waves from coalescing binaries almost ten years ago.
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I'll give an overview of the current development of the perturbative expansion of the two body dynamics, focusing on the contribution of radiatve modes to 6th post-Newtonian order. -
Jozef Bucko (ETH Zurich)Oral Talk
Diffuse X-ray emission from hot intracluster gas and emission from active galactic nuclei (AGN) provide complementary tracers of large-scale structure, encoding rich information about baryonic feedback, black hole and galaxy formation, and cosmology. These observables are particularly promising for cross-correlation studies with upcoming wide-field X-ray surveys.
We present a...
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Sandro Dias Pinto Vitenti (Universidade Estadual de Londrina)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...
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Josh Kable (Rutgers University)Poster + Fireslide
Recent supernova measurements from Pantheon+, DES Y5, and Union3 tend to prefer high values of the fractional matter density, Omega_m, relative to CMB + BAO data or even Pantheon supernova constraints. This preference has important consequences on cosmological constraints for both early universe and late universe dark energy models. I will highlight some of these consequences. In particular, I...
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Thomas Cornish (Imperial College London)Poster + Fireslide
Joint analysis of the clustering of Lyman-break galaxies (LBGs) and weak gravitational lensing of the cosmic microwave background (CMB) provides a means of constraining cosmological parameters such as $\sigma_8$ at high redshift. Furthermore, combining these two probes helps to break the degeneracy between $\sigma_8$ and the galaxy bias of the LBG population, offering improved constraints over...
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Ronaldo Batista (Federal University of Rio Grande do Norte)Oral Talk
Recent observational determinations of the cosmological growth index suggest values significantly higher than the standard ΛCDM prediction. I will discuss whether two cosmological scenarios can account for such high values. First, I will show that both homogeneous and clustering dark energy models face serious difficulties in producing elevated growth index values (arXiv:2411.00963). Next, I...
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