A contrastive self-supervised convolutional autoencoder detects core-collapse supernova gravitational waves with performance comparable to supervised CNNs, better generalization to unseen waveforms, and ~120 kpc sensitive distance under Einstein Telescope noise.
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DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
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We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology inference, these galaxy measurements are combined with DESI Lyman-$\alpha$ forest BAO results presented in a companion paper. The DR2 BAO results are consistent with DESI DR1 and SDSS, and their distance-redshift relationship matches those from recent compilations of supernovae (SNe) over the same redshift range. The results are well described by a flat $\Lambda$CDM model, but the parameters preferred by BAO are in mild, $2.3\sigma$ tension with those determined from the cosmic microwave background (CMB), although the DESI results are consistent with the acoustic angular scale $\theta_*$ that is well-measured by Planck. This tension is alleviated by dark energy with a time-evolving equation of state parametrized by $w_0$ and $w_a$, which provides a better fit to the data, with a favored solution in the quadrant with $w_0>-1$ and $w_a<0$. This solution is preferred over $\Lambda$CDM at $3.1\sigma$ for the combination of DESI BAO and CMB data. When also including SNe, the preference for a dynamical dark energy model over $\Lambda$CDM ranges from $2.8-4.2\sigma$ depending on which SNe sample is used. We present evidence from other data combinations which also favor the same behavior at high significance. From the combination of DESI and CMB we derive 95% upper limits on the sum of neutrino masses, finding $\sum m_\nu<0.064$ eV assuming $\Lambda$CDM and $\sum m_\nu<0.16$ eV in the $w_0w_a$ model. Unless there is an unknown systematic error associated with one or more datasets, it is clear that $\Lambda$CDM is being challenged by the combination of DESI BAO with other measurements and that dynamical dark energy offers a possible solution.
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- abstract We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology inference, these galaxy measurements are combined with DESI Lyman-$\alpha$ forest BAO results presented in a companion paper. The DR2 BAO results are consistent with DESI DR1 and SDSS, and their distance-redshift relationship matches those from recent compilations of supernovae (SNe) over the same redshift range. The results are well described by a flat $\Lambda$
- background modulus field paired with the MI axion, should receive its dominant mass contributions from SUSY breaking and may parametrically have a mass of orderm 3/2; verify- ing that this modulus field does not cause cosmological problems deserves further study. On the other hand, our analysis applies directly to compactifications on simply-connected CY 3-folds, in- cluding non-standard embeddings-line bundle sums [88, 89], monad bundles, and spectral cover models-that re- alize the Standard Model without
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Probing nonlinear structure formation beyond $\Lambda$CDM with the LSS bootstrap: a joint power spectrum and bispectrum analysis
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Late-time reconstruction of non-minimally coupled gravity with a smoothness prior
Non-parametric reconstruction of non-minimally coupled gravity with a smoothness prior on CMB, DESI BAO, supernovae, and DES data yields a 2.8σ hint for coupling and a preference for phantom divide crossing stabilized by the coupling.
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GI BAO as a cosmological consistency check
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Kinematic Lensing Ratio: Reviving Weak Lensing Cosmography as a Geometric Dark Energy Probe
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First observational constraints on cosmic backreaction over an extended redshift range
First direct constraints on total cosmic backreaction over a significant redshift range are consistent with vanishing backreaction within 1 sigma but are too weak to exclude meaningful backreaction.
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Cosmological analysis of the DESI DR1 Lyman alpha 1D power spectrum
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$O_k$ null test with multi-task Gaussian processes: cosmic curvature and data compatibility
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CosmoGen: A genetic algorithm framework for the exploration of dark energy dynamics
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Tomographic Alcock-Paczynski Test with Marked Correlation Functions
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A Bayesian estimator for peculiar velocity correction in cosmological inference from supernovae data
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Analytic compression of the effective field theory of the Lyman-alpha forest
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Low-redshift-agnostic BAO Constraints on Binned Dark-energy Density Evolution from DESI DR1 and DR2
A low-redshift-agnostic BAO compression applied to DESI data yields binned constraints on dark-energy density evolution X(z) that are consistent with a constant value.
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Measurement of the galaxy-velocity power spectrum of DESI tracers with the kinematic Sunyaev-Zeldovich effect using DESI DR2 and ACT DR6
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Velocityformer: Broken-Symmetry-Matched Equivariant Graph Transformers for Cosmological Velocity Reconstruction
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Saturation Mechanisms in the Interacting Dark Sector
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Sign-Switching Dark Energy: Smooth Transitions with Recent DESI DR2 Observations
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Massive neutrinos and interacting dark matter look alike through the lens of lensing
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$H_0$ Without the Sound Horizon (or Supernovae): A 2% Measurement in DESI DR1
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Probing the limits of cosmological information from the Lyman-$\alpha$ forest 2-point correlation functions
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Dynamic or Systematic? Bayesian model selection between dark energy and supernova biases
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Parity Violation in Galaxy Shapes: Primordial Non-Gaussianity
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SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
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DESI Dark Secrets
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Bounding axion dark energy
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Diagnostic Consistency Tests of the Concordance Cosmology
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Model-independent constraints on generalized FLRW consistency relations with bootstrap-based symbolic regression
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The impact of evolving dark energy on the Weyl potential measured from the Dark Energy Survey Year 3 data
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Signatures of Modified Gravity Below $\mathcal{O}(10)$ Mpc in a Dynamical Dark Energy Background
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Negative neutrino mass or negative dark energy?
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Interacting Dark Sector field theory with phantom crossing
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UNIONS-3500 Weak Lensing: III. 2D Cosmological Constraints in Configuration Space
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Ultra-light axion constraints from Planck and ACT: the role of nonlinear modelling
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Cosmological test of a length-preserving biconnection gravity
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On the origin of the environmental step: A BayeSN view of the ZTF SN Ia DR2
BayeSN analysis of ZTF Type Ia supernovae confirms a ~0.1 mag intrinsic environmental step in standardized brightness that is not explained by differences in dust extinction properties.