Beyond the Basics: Refining Quark Pair Creation Models
![The comparison of squared amplitudes, [latex]|M^{SL}|^{2}[/latex], across non-relativistic and relativistic calculations-extended to a broader range of off-shell energies and utilizing parameters consistent with prior analysis-demonstrates how these fundamental quantities diverge under differing theoretical frameworks.](https://arxiv.org/html/2604.21403v1/x6.png)
A new study offers a detailed comparison of relativistic and non-relativistic approaches to modeling quark pair creation in meson decays, revealing subtle but potentially important differences.
Science
Mapping Magnetic Order: A New Platform for Unconventional Magnet Discovery
Researchers have developed an open-source platform, FINDSPINGROUP, to systematically analyze magnetic symmetry and predict the properties of novel magnetic materials.
Designing Magnetic Materials with AI
A new framework leverages artificial intelligence to efficiently discover materials that block magnetism, opening doors for next-generation spintronics and quantum computing.
Beyond Shape: A New Calculus of Space and Measure
This review introduces a powerful mathematical framework for defining spaces and their associated metrics, moving beyond traditional geometric constraints.
Echoes of the Early Universe: Quantum Signatures in Inflationary Sound Waves
![The study reveals how the spectral index [latex]\phi_k[/latex] scales with cosmological horizon size [latex]\log_{10} a[/latex] during inflationary expansion, demonstrating this relationship for a specific wavenumber [latex]k=1[/latex] and a normalized Hubble parameter [latex]H_0 = 1[/latex].](https://arxiv.org/html/2604.21755v1/phi_k_0.04.png)
New research explores how the speed of sound during the universe’s rapid expansion alters the quantum properties of its initial fluctuations.
Spinning into Chaos: The Quantum Kicked Top
![The probability distribution [latex]P(s)[/latex] was analyzed for the QKT system with [latex]p=\pi/2[/latex] and [latex]j=1000.5[/latex], revealing how its shape shifts markedly with varying values of <i>k</i>-specifically, at 0.1, 2.5, 2.75, and 6.0-demonstrating a sensitivity to this parameter that dictates the system’s probabilistic behavior.](https://arxiv.org/html/2604.12345v1/x8.png)
This review explores the quantum kicked top, a fundamental model system used to understand the complex transition between order and chaos at the quantum level.
Entangled Top Quarks: A New Window to Physics Beyond the Standard Model
![Entanglement markers are mapped across the [latex]\(\left(s, \theta / \pi\right)\)[/latex] plane to differentiate between the Standard Model and extensions incorporating scalar mediation, [latex]\(U(1)_{B-L}\)[/latex] symmetry, or Randall-Sundrum models.](https://arxiv.org/html/2604.21332v1/Emarker_con_RS.jpg)
Researchers are exploring how the quantum correlations of top quarks produced at future colliders could reveal subtle hints of new interactions, going beyond our current understanding of particle physics.
Heavy Quarks in the Extreme: Unlocking the Secrets of Quark-Gluon Plasma
New lattice QCD calculations shed light on the behavior of heavy quarks at high temperatures, offering insights into the properties of matter created in heavy-ion collisions.
Twisting Towards Control: Engineering Edge States in 2D Materials
![The electronic structure of twisted [latex]WSe_2[/latex] nanoribbons exhibits a nuanced relationship between twist angle and edge localization, where energies are mapped against moiré quasi-momentum and band positioning is relative to the highest occupied band, revealing how these factors dictate the confinement of electronic states to the ribbon edges.](https://arxiv.org/html/2604.19929v1/FIG2.png)
A new continuum model reveals how manipulating twisted bilayer materials allows precise control over the emergence and properties of topological edge states.
FRB Signals Reveal Dynamic Magnetic Fields
New research identifies rapid changes in the polarization of repeating Fast Radio Bursts, hinting at complex and evolving magnetic environments around their sources.