Hunting Invisible Light: New Limits on Dark Photon Dark Matter
![This work establishes upper limits on the kinetic-mixing parameter ε as a function of dark-photon mass [latex]m_{A^{\prime}}[/latex], derived from [latex]B_{x}B_{y}[/latex] and [latex]B_{y}B_{x}[/latex] channels and enhanced through noise subtraction utilizing [latex]B_{z}[/latex] as a coherent reference, demonstrating a sensitivity reaching over [latex]10^{7}[/latex] scanned masses and providing constraints complementary to those from astrophysical observations and existing bounds such as the Coulomb-law limit and projections for future implementations with sensitivities of [latex]0.1\,\mathrm{fT}/\sqrt{\mathrm{Hz}}[/latex].](https://arxiv.org/html/2602.22308v1/2602.22308v1/x2.png)
A sensitive laboratory search employing advanced magnetic shielding and signal processing techniques has constrained the properties of ultralight dark photons.
Science
Beyond Strings: Unraveling Matrix Quantum Mechanics
New research reveals deep connections between matrix models, holographic duality, and the hidden symmetries of string theory and supergravity.
The Memory of Superconductivity: A New Path to Higher Temperatures
![The emergence of superconductivity hinges on a delicate balance, where the transition temperature [latex] T_c(p) \sim E_{\rm pair}\rho_0(p) [/latex] peaks near a correlated critical point [latex] p_c [/latex], governed not by complex interactions, but by the finite infrared extent of collective relaxation modes-a principle demonstrated by the linear scaling between transition temperature and superfluid stiffness [latex] T_c \propto \rho_s [/latex] across diverse material families.](https://arxiv.org/html/2602.22626v1/2602.22626v1/x3.png)
A novel framework linking collective dynamics and long-range memory effects offers a promising explanation for the enduring mystery of high-temperature superconductivity.
Warped Spacetime: How Noncommutativity Alters Particle Motion
New research explores how the principles of noncommutative geometry reshape the behavior of particles in strong gravitational fields, predicting a position-dependent effective mass.
Unlocking the Secrets of Charm: Exotic Hadrons in Heavy Ion Collisions
New predictions detail how upcoming experiments at FAIR and the LHC can shed light on the production of rare charmed hadrons and nuclei, offering a window into the strong force.
Untangling Quantum Correlations in Fermi Gases
![The spatial behavior of correlation functions-specifically [latex]g_{ss^{\prime}}(\delta{\bf r})[/latex] and [latex]g_{nn}(\delta{\bf r})[/latex]-reveals distinct characteristics of translationally and rotationally invariant systems dependent on interaction parameters, exhibiting behavior consistent with either a deep BCS regime ([latex]\ln k_{\rm F}a=2.15[/latex]) or a crossover region ([latex]\ln k_{\rm F}a=0.36[/latex]), as modulated by the level of approximation detailed in Table 1.](https://arxiv.org/html/2602.23019v1/2602.23019v1/x1.png)
New theoretical work clarifies the interplay of spin, symmetry, and the Pauli exclusion principle in understanding correlated behavior across the BCS-BEC crossover.
Lost Light, Hidden Fields: How Magnetic Chaos Could Unlock Gamma-Ray Mysteries
![The study demonstrates that highly energetic photons observed by LHAASO can be explained through the mixing of axion-like particles and photons within strong, non-Gaussian magnetic fields, with survival probability [latex]\mathcal{P}\_{\gamma\rightarrow\gamma}[/latex] dependent on parameters κ and [latex]\lambda\_{\rho}[/latex] but independent of axion-like particle mass, suggesting a mechanism where even established theoretical frameworks are vulnerable beyond certain thresholds.](https://arxiv.org/html/2602.23249v1/2602.23249v1/FigNGCase3.png)
A new analysis reveals that complex intergalactic magnetic fields may dramatically increase the survival of high-energy photons, potentially explaining observed gamma-ray fluxes and opening a window into elusive axion-like particles.
Dancing Vortices: New Magnetoresistance Effect in 2D Superconductors
![The oscillatory behavior of magnetoresistance in [latex]NbSe_2[/latex] devices exhibits a clear dependence on layer thickness, transitioning from distinct oscillations in trilayer and four-layer structures to a more continuous response in six-layer devices and ultimately a bulk-like characteristic, a phenomenon consistently observed across varying temperatures.](https://arxiv.org/html/2602.22788v1/2602.22788v1/x2.png)
Researchers have discovered periodic magnetoresistance oscillations in few-layer niobium diselenide, revealing a unique mechanism driven by thermally activated vortices in a fluctuating superconducting state.
Revealing Hidden Order: How Sound Waves Can Unlock Quantum Magnetism
![The study of spin noise (SN) phase reveals that magnetic fields significantly alter phonon-magnon band spectra, with coupling between these excitations modulating the relative weight of phonon-like and magnon-like components within each band at an intrinsic frequency of [latex]\hbar\omega_{0}/J = 0.41[/latex].](https://arxiv.org/html/2602.22283v1/2602.22283v1/x2.png)
A new study demonstrates that subtle changes in phonon spectra can be used to detect previously hidden spin-nematic order and dynamics in quantum magnets.
Chiral Superconductivity from Altermagnetic Splitting
![The distribution of pairing amplitudes-specifically [latex]\Delta_{aa;s}^{\uparrow\downarrow}[/latex], [latex]\Delta_{aa;es}^{\uparrow\downarrow}[/latex], [latex]\Delta_{aa;d+id}^{\uparrow\downarrow}[/latex] for spin singlets and [latex]\Delta_{aa;f}^{\uparrow\uparrow}[/latex], [latex]\Delta_{bb;f}^{\uparrow\uparrow}[/latex], [latex]\Delta_{aa;p+ip}^{\uparrow\uparrow}[/latex], [latex]\Delta_{bb;p+ip}^{\uparrow\uparrow}[/latex] for spin triplets-reveals the stabilized ground state phases determined by minimizing condensation energy across varying [latex]JJ[/latex] points on the A and B sublattices, with parameters μ and [latex]V_{1}[/latex] defining the observed regions.](https://arxiv.org/html/2602.22736v1/2602.22736v1/x4.png)
New research reveals how altermagnetic order can induce chiral superconductivity by reshaping electronic states and suppressing conventional pairing.