The Hunt for Hidden Particles: A New Probe of Sub-GeV Dark Matter
![The study elucidates dark matter-nucleon scattering and the decay of eta mesons into two pions via a scalar resonance, demonstrating that the coupling strength [latex]g_{u}(g_{\chi})[/latex] - and its effective counterpart [latex]g_{N}[/latex] as defined in equations (3) and (5) respectively - fundamentally governs these interactions.](https://arxiv.org/html/2601.10597v1/x701.png)
Researchers are leveraging meson decays to search for extremely light dark matter candidates, opening a novel window into the universe’s missing mass.
Science
Beyond Isolation: Why Gravity Always Gets Its Due
New research suggests that completely separating topological field theories from the influence of gravity is fundamentally impossible, challenging assumptions about global symmetries in quantum gravity.
Beyond Contact: Cavity QED Shapes Long-Range Quantum Gases
![The study demonstrates how cavity-mediated interactions sculpt the behavior of two-body wavefunctions, revealing distinct ground states-either spatially extended for repulsive interactions at strengths of [latex]V_0 = 10\varepsilon[/latex] and [latex]V_0 = 100\varepsilon[/latex], or localized for the corresponding attractive cases-as dictated by the second term of Eq. (II.2).](https://arxiv.org/html/2601.10301v1/x1.png)
New simulations reveal how light confinement dramatically alters the behavior of interacting quantum particles, leading to exotic phases and delocalized states.
Beyond Symmetry: Harnessing Quantum Magnetoelectricity for Novel Light Control
New research delves into the exotic light-matter interactions arising from broken symmetries in quantum materials, opening doors to advanced metamaterials and quantum devices.
Unlocking the Quark-Gluon Plasma with Resonance Signatures
![The distributions of [latex]\pi^+ \pi^-[/latex] and [latex]K_S^0 K_S^0[/latex] pairs are modeled with relativistic Breit-Wigner functions to identify resonance peaks, while a smoothly varying function accounts for residual background, effectively distinguishing signal from noise in the data.](https://arxiv.org/html/2601.09777v1/x6.png)
New results from the ALICE experiment reveal how short-lived particles can illuminate the final moments of heavy-ion collisions and probe the structure of exotic hadrons.
Reading Material’s Shape: Unlocking Topology with Light
A new spectroscopic technique allows researchers to directly map the geometric and topological properties of materials by analyzing how light interacts with their electronic structure.
Beyond the Quantum Limit: Time Crystals Unlock Precision Sensing
Researchers have harnessed the unique properties of dissipative Rydberg atom time crystals to achieve multi-parameter sensing with accuracy surpassing classical limitations.
Holographic Entanglement in Deformed Spacetime
![The system demonstrates how variations in a deformation parameter influence energy distribution-specifically, the real part of the Hawking-Eberhardt function [latex]\text{HEE}[/latex] and quantities [latex]\mathcal{Q}\_{\pm}[/latex]-for both purely timelike intervals and scenarios with non-vanishing chemical potential, suggesting a nuanced relationship between spacetime geometry and energy fluctuations at [latex]t=2[/latex], [latex]\beta=\sqrt{8}\pi[/latex], [latex]\Omega=0[/latex], and [latex]c=12\pi[/latex].](https://arxiv.org/html/2601.10213v1/x4.png)
New research explores how entanglement behaves in two-dimensional quantum field theories distorted by specific types of deformation, using a powerful connection between gravity and quantum mechanics.
Sculpting Space-Time with Hyperbolic Lattices
Researchers have demonstrated the ability to engineer complex topologies in space and time using a novel type-II hyperbolic lattice structure.
Shining a Light on Magnetism
![Light can induce magnetization through the intrinsic quantum geometry of a material, specifically via the quadrupole density of the quantum metric and a weighted quantum metric term [latex]\partial\left(Gv\right)[/latex], demonstrating a pathway where polarized light directly influences magnetic properties.](https://arxiv.org/html/2601.09637v1/x1.png)
New research reveals that light can induce magnetism in materials through subtle geometric properties of their electronic structure.