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Challenges to the Lambda CDM Cosmology
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Observations of the cosmic microwave backgroundradiation are described to remarkable accuracy by the six-parameterLambda CDM cosmology. However, the key ingredients of this model, namely dark matter, dark energy and cosmic inflation are not understood at a fundamental level. It is therefore important to investigate tensions between the CMB and other cosmological probes. I will review aspects of tensions with direct measurements of the Hubble constant H_0, measurements of weak gravitational lensing, and the recent hints of evolving dark energy reported by the Dark Energy Spectroscopic Instrument (DESI) collaboration.
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Cited by 4 Pith papers
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A Quantitative Framework for Testing the Hubble Tension in a Bianchi Type I Cosmological Background
An analytic weak-shear Bianchi I calculation bounds the low-redshift luminosity-distance quadrupole to |Aμ(0.15)|≲2.4×10^-11 mag under BBN shear limits, ruling out shear-only resolution of the Hubble tension.
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Cosmology from Planck CMB Lensing and DESI DR1 Quasar Tomography
DESI DR1 quasars cross-correlated with Planck PR4 lensing give sigma8 = 0.929 and S8 = 0.922, about 1.5 sigma above Planck's LCDM prediction, and a sound-horizon-free H0 = 69.1 km/s/Mpc.
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Fast Sampling of Cosmological Initial Conditions with Gaussian Neural Posterior Estimation
Cosmological initial conditions can be sampled from a learned Gaussian posterior with a Fourier-diagonal covariance, giving thousands of reconstructions in seconds on a GPU.
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Testing Quasi-Linear Coasting Cosmologies with Late-Time Large-Scale Structure Growth
A closed-form growth factor for linearly expanding (coasting) cosmologies is derived and fit to fσ8 data, showing all tested models are consistent but Lambda-CDM is statistically preferred.
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