GI BAO provides a robust consistency check for density BAO and shear data, with the first photometric measurement on DES Y3 showing agreement at α = 0.966 ± 0.252.
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ArXiv e-prints(2026) 2601.14559
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New simulations show that cross-correlating gravitational wave background anisotropies with galaxy distributions can enable discovery at angular scales of 4-6 degrees with next-generation observatories.
tSZ cross-correlations with large-scale structure tracers prefer low S8 and strong baryonic feedback, yielding S8 = 0.72 and low group baryon fraction in FLAMINGO simulations.
FRB dispersion is an approximately unbiased tracer of matter on linear scales, enabling direct constraints on the baryonic parameter B8 independently of feedback and with statistical power comparable to weak lensing using far fewer objects.
UNIONS-3500 weak lensing data yields S_8 = 0.831^{+0.067}_{-0.078} in flat LCDM from 2D cosmic shear, consistent with Planck within 1 sigma.
SN peculiar velocities plus Planck CMB data give joint constraints on σ8, γ, and Ωk, with hints of positive curvature (Ωk ≈ -0.01) at 2-3σ and γ values consistent with GR.
Reionization histories with higher total optical depth can move the best-fit neutrino mass sum to positive values around 0.06 eV within 95% confidence from CMB and BAO data.
Smokescreen is a Python package that blinds cosmological data vectors using Firecrown likelihoods on SACC files while encrypting the true data to avoid premature unblinding.
cloelike is a new open Python package implementing composable Gaussian likelihoods for WL, GCph, GGL, full-shape spectra, and BAO in joint probe combinations for Euclid analyses.
cloelib is a modular JAX-based Python library for cosmological observables intended as reference infrastructure for Euclid's first data release.
DESI DR2 data reveals a mild mismatch for flat LambdaCDM in CMB-calibrated fits, with evolving dark energy models like CPL improving the fit in a dataset-dependent manner sensitive to supernova calibration residuals at the 0.01-0.02 mag level.
DES BAO and supernova data combined with CMB favor evolving dark energy at about 3 sigma, challenging the cosmological constant model.
Cosmology evolved from the classical Big Bang based on expansion, nucleosynthesis, and CMB to a 'Big Bang 2.0' paradigm requiring new physics for dark matter and dark energy amid current parameter tensions.
citing papers explorer
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GI BAO as a cosmological consistency check
GI BAO provides a robust consistency check for density BAO and shear data, with the first photometric measurement on DES Y3 showing agreement at α = 0.966 ± 0.252.
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Prospects for multi-messenger discovery of the gravitational-wave background anisotropies via cross-correlation with galaxies
New simulations show that cross-correlating gravitational wave background anisotropies with galaxy distributions can enable discovery at angular scales of 4-6 degrees with next-generation observatories.
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FLAMINGO: The thermal history of the Universe from tSZ effect cross-correlations and its dependencies on cosmology and baryon physics
tSZ cross-correlations with large-scale structure tracers prefer low S8 and strong baryonic feedback, yielding S8 = 0.72 and low group baryon fraction in FLAMINGO simulations.
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Fast radio burst dispersion is an unbiased tracer of matter on large scales
FRB dispersion is an approximately unbiased tracer of matter on linear scales, enabling direct constraints on the baryonic parameter B8 independently of feedback and with statistical power comparable to weak lensing using far fewer objects.
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UNIONS-3500 Weak Lensing: III. 2D Cosmological Constraints in Configuration Space
UNIONS-3500 weak lensing data yields S_8 = 0.831^{+0.067}_{-0.078} in flat LCDM from 2D cosmic shear, consistent with Planck within 1 sigma.
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Joint Curvature and Growth Rate measurements with Supernova Peculiar Velocities and the CMB
SN peculiar velocities plus Planck CMB data give joint constraints on σ8, γ, and Ωk, with hints of positive curvature (Ωk ≈ -0.01) at 2-3σ and γ values consistent with GR.
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Reionization History and Neutrino Mass
Reionization histories with higher total optical depth can move the best-fit neutrino mass sum to positive values around 0.06 eV within 95% confidence from CMB and BAO data.
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Smokescreen: A Python package for data vector blinding and encryption in cosmological analyses
Smokescreen is a Python package that blinds cosmological data vectors using Firecrown likelihoods on SACC files while encrypting the true data to avoid premature unblinding.
-
cloelike: A Python Library for Cosmological Likelihood Inference in the Euclid Era
cloelike is a new open Python package implementing composable Gaussian likelihoods for WL, GCph, GGL, full-shape spectra, and BAO in joint probe combinations for Euclid analyses.
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cloelib: A Flexible Python Library for Computing Cosmological Observables in the Euclid Era
cloelib is a modular JAX-based Python library for cosmological observables intended as reference infrastructure for Euclid's first data release.
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Dark Energy After DESI DR2: Observational Status, Reconstructions, and Physical Models
DESI DR2 data reveals a mild mismatch for flat LambdaCDM in CMB-calibrated fits, with evolving dark energy models like CPL improving the fit in a dataset-dependent manner sensitive to supernova calibration residuals at the 0.01-0.02 mag level.
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Challenges to the cosmological constant model following results from the Dark Energy Survey
DES BAO and supernova data combined with CMB favor evolving dark energy at about 3 sigma, challenging the cosmological constant model.
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Cosmology since the first Astro/Cosmo Moriond meeting// The emergence of the Big Bang 2.0
Cosmology evolved from the classical Big Bang based on expansion, nucleosynthesis, and CMB to a 'Big Bang 2.0' paradigm requiring new physics for dark matter and dark energy amid current parameter tensions.