Cosmic Consistency Check: New Test Validates Standard Cosmology
![The reconstruction of the flat-FLRW null test [latex]\mathcal{C}(z)[/latex] from anisotropic BAO data, and its integrated form [latex]\mathcal{C}_{\rm int}(z)[/latex], reveals a discernible pattern when contrasted against the null expectation, suggesting the potential to map cosmological parameters through subtle anisotropies.](https://arxiv.org/html/2603.18986v1/x4.png)
A novel analysis of baryon acoustic oscillations offers a calibration-free method to verify the foundations of our understanding of the universe.
Science
Untangling the Strong Force: New Insights from Bottomonium Decay
![The study demonstrates that precision in extracting [latex]\rho_8(m_b)[/latex] from the Artru-Collins asymmetry in [latex]\chi_{b2}[/latex] decay at Belle II increases with integrated luminosity, though this extraction differs significantly depending on whether [latex]\chi_{b2}[/latex] is produced in the laboratory frame (represented by the blue band) or the center-of-mass frame (orange band), highlighting a crucial dependency in decay analysis.](https://arxiv.org/html/2603.18874v1/x4.png)
A novel analysis of particle spins in bottomonium decays offers a promising path towards a more precise understanding of how quarks bind together, resolving long-standing theoretical discrepancies.
Inside Neutron Stars: How Neutrinos Shape the Core
![The study delineates gravitational mass-radius relationships for non-rotating, isentropic stars, demonstrating how varying entropy-specifically at [latex]S=1[/latex] and [latex]S=2[/latex]-and the inclusion or exclusion of neutrino trapping impacts stellar structure, with resulting models constrained by observational data from pulsars PSR J0030+0451 and PSR J0740+6620.](https://arxiv.org/html/2603.19085v1/figures/MR_LS50_GV10_rhot51_Iso_Ye04_NICER.png)
New research reveals that trapped neutrinos play a crucial role in determining the composition and properties of hybrid stars-celestial bodies containing both normal and exotic quark matter.
Two Faces of Darkness: Exploring Multi-Component Dark Matter
![The study demonstrates how the combined abundance of dark matter candidates-represented by [latex]\Omega_{\chi}[/latex] and [latex]\Omega_{s}[/latex]-varies with their respective masses, revealing a parameter space consistent with Planck observations and defined by the fractional abundances [latex]\xi_{\chi,s} = \Omega_{\chi,s} / \Omega_{DM}[/latex] as determined from a full parameter-space scan and benchmarked in Tab. 1.](https://arxiv.org/html/2603.18158v1/x2.png)
A new study delves into the possibility of dark matter being comprised of multiple interacting particles within an extension of the Two-Higgs-Doublet Model.
Unlocking Hidden Order: A New Framework for Fermion Systems
Researchers have developed a systematic method for identifying potential order parameters in interacting fermion systems, paving the way for a deeper understanding of complex quantum phases.
Dancing on the Edge of Chaos
New research explores the delicate balance between stability and instability in multi-body gravitational systems.
Beyond Gibbs: A New Path to Thermal Equilibrium
New research reveals that accurately describing systems at thermal equilibrium requires a refined application of the maximum entropy principle, moving beyond traditional ensemble formulations.
Mapping the Magnetic Landscape of a Quantum Material
New microscopy reveals how both local grain boundaries and long-range interactions shape the magnetic order in a quantum anomalous Hall insulator.
Unveiling the Hot Heart of Matter: Thermal QCD Beyond Perturbation
![The study demonstrates how screening masses-specifically pseudoscalar, vector, baryonic, and additional mesonic states at [latex]n=0[/latex] and [latex]n=1[/latex]-respond to variations in the QCD coupling, effectively linking these changes to temperature and revealing the inherent relationship between these fundamental parameters.](https://arxiv.org/html/2603.18700v1/x5.png)
New lattice simulations explore how quark-gluon interactions change at extreme temperatures, pushing the boundaries of our understanding of matter’s fundamental building blocks.
Mapping the Web: How Hyperbolic Space Explains Network Structure
A new review explores how embedding networks within hyperbolic geometry offers a powerful framework for understanding complex relationships and scaling behavior.