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Georgia Kiddier (DAMTP, University of Cambridge)08/09/2026, 14:30Poster + 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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Andy Nilipour Nilipour (University of Cambridge, Harvard University)08/09/2026, 14:32Poster + 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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Andrea Pari (University of Cambridge)08/09/2026, 14:34Poster + 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... -
Kai Lehman (LMU Munich / CCA)08/09/2026, 14:36Poster + 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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Amanda Freitas Cruz (Brazilian Center for Research in Physics (CBPF))08/09/2026, 14:38Poster + 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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Vicente Pedreros (Universidad de Chile)08/09/2026, 14:40Poster + 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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Pedro Ribeiro (Universidade Estadual de Londrina)08/09/2026, 14:42Poster + 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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Guilherme de Souza Fernandes (IFT-Unesp)08/09/2026, 14:44Poster + 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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Ben Sherwin (Stanford University)08/09/2026, 14:46Poster + 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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Léa Dumilly08/09/2026, 14:48Poster + Fireslide
The cosmic microwave background (CMB) traces the matter distribution through the imprints left by its interactions with large-scale structure. Together, the CMB and large-scale structure probes provide complementary insights into the matter distribution at different epochs of the Universe. Their distinct theoretical modeling and observational systematics make cross-correlations between them a...
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Josiel Mendonça (Universidade Federal do Espírito Santo, Espírito Santo, Brazil)08/09/2026, 14:50Poster + Fireslide
The next generation of gravitational-wave (GW) observatories will enable the detection of a large number of compact binary mergers, opening new possibilities for cosmology with standard sirens. In particular, dark sirens—GW events without electromagnetic counterparts—offer a promising way to measure cosmological parameters by statistically associating GW sources with galaxy catalogs.
In...
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