Decoding Black Hole Geometry from Boundary Data
![The distribution of pole-skipping points in a rotating BTZ black hole-identified as intersections of the poles and zeros of its retarded Green’s function-precisely corresponds to locations [latex]\big(\mathfrak{m}\_{n},k\_{nj}\big)[/latex] derived from near-horizon analysis, and exhibits an asymmetry attributable to the black hole’s rotation.](https://arxiv.org/html/2604.14638v1/x1.png)
A new analytical framework allows researchers to reconstruct the shape of black holes, even rotating ones, using information from their boundaries.
Science
Unconventional Charge Order Emerges in Kagome Metal
![In CsV3Sb5, a kagome lattice material, the emergence of an odd-parity [latex]f-f[/latex]-wave charge order breaks both [latex]C_{6z}[/latex] and inversion symmetries, opening a gap at the Dirac crossing near the Fermi energy and modifying the electronic density of states-a phenomenon that expands the established phase diagram beyond standard charge order and superconducting states.](https://arxiv.org/html/2604.14538v1/Figures/FIG05.jpg)
New research reveals an unusual form of electronic organization in CsV3Sb5, challenging conventional understanding of charge ordering phenomena.
Beyond Thermal Freeze-In: How Non-Equilibrium Dynamics Shape Dark Matter
New research reveals that deviations from thermal equilibrium can dramatically alter dark matter relic abundance in freeze-in scenarios, particularly within complex dark sectors.
Hunting for Magnetic Signals in Fast Radio Bursts
![Automated detection identified flare phases in fifteen repeating fast radio bursts, utilizing significance scores exceeding a rigorous threshold of [latex]T_{\rm tri} = 10[/latex] to delineate these events with sub-cadence temporal precision, and adaptive baseline subtraction to accurately measure rotation measure fluctuations.](https://arxiv.org/html/2604.15012v1/x15.png)
A new algorithm automatically detects subtle changes in the magnetic environment around repeating fast radio bursts, offering a clearer view of their origins.
Dark Matter’s Subtle Rhythms
![The study demonstrates that wave-envelope dynamics exhibit modulation at two distinct timescales-a slow modulation with period [latex]\tau \sim eq 2\pi/(\mu M)[/latex] and a fast oscillation with period [latex]T \sim eq 2\pi/M[/latex]-resulting in characteristic sidebands at frequencies [latex]m_\phi \pm 2\mu M_\Phi[/latex] within the frequency spectrum, a clear departure from the single peak expected of monochromatic signals and indicative of a complex interplay between mass scales of comparable magnitude [latex]m_\phi \sim eq M_\Phi \sim eq M[/latex].](https://arxiv.org/html/2604.14480v1/x2.png)
New research suggests that interactions between ultralight dark matter waves can create complex patterns, potentially opening new avenues for detection.
Beyond Conventional Conductivity: Unraveling the Mysteries of Quantum Criticality
![The study of unconventional superconducting materials reveals how electrical resistivity changes with temperature, demonstrating that extrapolations to zero temperature can indicate either conventional Fermi-liquid behavior - described by [latex]\rho=\rho\_{0}+AT^{2}[/latex] - or a non-Fermi-liquid, ‘strange-metal’ state characterized by [latex]\rho=\rho\_{0}+A\_{n}T^{n}[/latex] with [latex]n<2[/latex], with the presence of a non-physical residual resistivity in some high-residual-resistivity-ratio samples suggesting a complex transition below the superconducting temperature [latex]T\_{sc}[/latex].](https://arxiv.org/html/2604.14952v1/Figure5.png)
New research scrutinizes the electrical behavior of unconventional superconductors to distinguish between intrinsic quantum phenomena and the effects of superconductivity itself.
Unlocking Hadronic Secrets with Rare Meson Decays
![The differential decay rate for [latex]K^{*}\(892)\rightarrow K\ell^{+}\ell^{-}[/latex] is modeled with a pole mass defined as [latex]\Lambda=m_{\rho}[/latex], providing a foundational parameter for understanding this particle decay process.](https://arxiv.org/html/2604.14735v1/x2.png)
A new analysis of the K* meson’s decay offers a unique window into the fundamental structure of matter and the search for hidden particles.
Hunting Hidden Particles: LDMX’s Potential to Uncover Dark Sector Secrets
![The study demonstrates that the LDMX experiment possesses sensitivity to new physics, specifically the parameter [latex]A^{\prime}[/latex], and projects limits exceeding those established by previous experiments, with sensitivity scaling dependent on integrated luminosity-achieving greater distinction with lower background event rates, as indicated by the comparison between curves representing 0.5, 5, and 50 background events at [latex]1\text{\times}{10}^{16}[/latex] EoT.](https://arxiv.org/html/2604.14359v1/x10.png)
A new detector simulation reveals the Light Dark Matter eXperiment could provide unprecedented sensitivity to long-lived, weakly interacting particles thought to comprise dark matter.
Dark Matter’s Internal Life: Shaping the Universe We See
![The evolution of density contrasts-illustrated for a mode [latex] k=60\,h\,\mathrm{Mpc}^{-1} [/latex]-demonstrates how differing velocity-dependent scattering cross-sections-defined by parameters ranging from [latex] n=-1 [/latex] to [latex] n=-2 [/latex] or incorporating a velocity scale [latex] v_{0} [/latex] between 0.01 and 0.1 km/s-shape the transition from superhorizon scales through phases of early subhorizon growth, conversion-driven behavior, acoustic oscillation, damping, and ultimately, late-time gravitational dominance.](https://arxiv.org/html/2604.15006v1/x4.png)
New research explores how interactions within dark matter itself influence the growth of cosmic structures and leaves detectable signatures in the universe.
Beyond Linear Gravity: A New Bootstrap for the Swampland
![The study delineates permissible parameter ranges within the [latex]\bigl((8\pi G)/(4\pi)^{4},\,g\_{2}/(4\pi)^{4}\bigr)[/latex] plane for gravitational loop contributions in six-dimensional flat spacetime, demonstrating consistency between tree-level calculations and one-loop results under the constraints of linear unitarity, and indicating a dependence on a heavy mass scale.](https://arxiv.org/html/2604.15235v1/x14.png)
Researchers are developing a novel framework to explore the boundaries of consistent quantum gravity theories, revealing unexpected patterns in how gravity interacts with other forces.