Unraveling the Mystery of Missing Matter
![The analysis of hyperon decay processes-specifically, measurements of weak and strong phase differences in [latex]\Xi^{-}[/latex] decays-reveals subtle discrepancies between experimental results and Standard Model predictions, with observed values consistently diverging from theoretical expectations and exhibiting confidence intervals-spanning 68.2%, 95.4%, and 99.7%-that suggest a potential breakdown in established physics beyond the precision of current models.](https://arxiv.org/html/2602.20524v1/x6.png)
New, highly precise measurements of hyperon decay are refining our understanding of why the universe is dominated by matter over antimatter.
Science
Hidden Rhythms in Quantum Materials
New observations reveal sequential mini-oscillations in the Dirac semiconductor ZrTe5, hinting at unexpected quantum behavior beyond established theory.
Harnessing Earth’s Core to Hunt for Dark Matter
![The Earth’s dense matter fundamentally alters the behavior of hypothetical axion dark matter particles through quadratic coupling with fermions, creating a localized gradient in the axion field-analogous to light refraction-that is maximized at the surface and detectable via a specialized comagnetometer configured to exploit this effect; this configuration leverages the differing responses of alkali-metal and noble-gas spins to external noise and the axion gradient to achieve ultrahigh sensitivity, with predicted enhancements scaling approximately as [latex] 1/(kR_{\mathrm{E}}) \times ((f_{\mathrm{a}}^{c}/f_{\mathrm{a}})^{2} [/latex] for a Compton frequency of 1 Hz and a decay constant of [latex] 10^{13.5} [/latex] GeV, demonstrating a spatially-confined, measurable signal concentrated near the Earth’s surface.](https://arxiv.org/html/2602.20260v1/x1.png)
A new experiment leverages the planet’s own magnetic field to boost the search for weakly interacting axions, a leading dark matter candidate.
Entangled Gravity: A New Path to Primordial Wave Detection
![The study demonstrates that as [latex] \lambda k(s) [/latex] approaches 0.5 - specifically transitioning from 0.1, 0.3 to 0.49 and 0.499 - the uncertainty product [latex] \Delta q \Delta_{q} [/latex] exhibits a critical behavior, suggesting a fundamental limit to precision even before accounting for slow-roll corrections.](https://arxiv.org/html/2602.20734v1/x2.png)
A novel theoretical framework suggests that quantum entanglement between hidden gravitational sectors could amplify primordial gravitational waves, offering a potential solution to longstanding constraints on early universe cosmology.
Beyond Magnetism: Unlocking New States of Matter
![Altermagnetic textures give rise to emergent spin-orbit coupling and odd-parity magnetism, demonstrated by the vanishing of an emergent Zeeman field [latex]V\_z \propto \cos 2\varphi[/latex] at specific points within circular Néel domain walls-where energy splitting stems solely from a metric-induced term [latex]\boldsymbol{\mathtt{g}}\_{\boldsymbol{p}}\propto\boldsymbol{p}\cdot\nabla\phi[/latex]-and, conversely, by the elimination of nodes in the energy contours of skyrmion textures due to contributions from both [latex]\nabla\theta[/latex] and [latex]\sin\theta\nabla\phi[/latex].](https://arxiv.org/html/2602.20236v1/x5.png)
A new understanding of altermagnetic textures is revealing unexpected links between spin arrangements, emergent electromagnetic fields, and the quantum behavior of electrons.
Beyond the Standard Model: The Spectroscopic Search for New Physics
![Precision spectroscopy, applied across diverse atomic, molecular, and exotic systems-including hydrogenic atoms, molecular ions, and muonium-establishes a complementary sensitivity to new physics, with the reach dependent on specific combinations of effective couplings to fundamental particles and modulated by the characteristic interaction range, as evidenced by the distinct sectors delineating sensitivity for electrons, muons, protons, and neutrons [latex] [/latex].](https://arxiv.org/html/2602.20750v1/x2.png)
Atomic and molecular spectroscopy are emerging as powerful tools to explore phenomena beyond our current understanding of the universe.
Quantum Islands: Engineering Exotic Anyons in Fractional Hall States
![Spherical braids, closely related to traditional Artin braids, differ in a crucial topological detail: while an Artin braid constructed by circling punctures on a plane is non-trivial, its spherical counterpart-represented by the sequence [latex]b_1b_2b_1b_2b_1[/latex]-collapses to a topologically trivial loop when all but one puncture remain fixed.](https://arxiv.org/html/2602.18748v1/graphics/SphericalBraid-labeled.png)
A new theoretical model details how superconducting islands can induce and stabilize non-abelian anyons within two-dimensional fractional quantum Hall liquids.
Seeing Symmetry: A New Way to Analyze Materials with Light
Researchers have developed a novel Raman spectroscopy technique that unlocks hidden details about a material’s crystalline structure with unprecedented sensitivity.
The High-Energy Frontier: Unveiling the Limits of Particle Scattering
![The study demonstrates how fitting parameters - [latex]\sigma_{t+} [/latex], [latex]\sigma_{t-} [/latex], [latex]\rho_{+} [/latex], and [latex]\rho_{-} [/latex] - using equations derived from data at varying minimum transverse momentum scales ([latex]s_{min} [/latex] of 5 GeV, 30 GeV, and 1 TeV) reveals dependencies inherent within the DB24 dataset, where fitted values incorporate a specific data subset while additional points serve for validation.](https://arxiv.org/html/2602.20005v1/x1.png)
A new analysis of proton-proton and proton-antiproton collisions suggests we may be approaching fundamental limits on how particles interact at ever-increasing energies.
Beyond the Horizon: Can Spinning Gyroscopes Reveal Naked Singularities?
![Within the ergoregion of a rotating Kerr-Newman black hole, orbital velocity Ω diverges near the central region for naked singularities, distinctly differentiating their behavior from that of a black hole where Ω remains finite, a phenomenon observable across varying [latex] Q [/latex] values and measured in units of [latex] M^{-1} [/latex] as a function of radial coordinate [latex] r [/latex] in units of [latex] M [/latex].](https://arxiv.org/html/2602.18972v1/x6.png)
A new analysis suggests that the precession of test gyroscopes could distinguish between the event horizons of black holes and the potentially observable surfaces of naked singularities.