Beyond the Standard Model: Hunting for New Physics in Rare Particle Decays
![The decay process of [latex]\bar{B}^{0}_{s}[/latex] into [latex]D^{*+}_{s}[/latex] (which further decays into [latex]D^{+}_{s}\pi^{0}[/latex]) alongside a tau lepton and its antineutrino is characterized by specific angular definitions - theta, theta-star, and chi - crucial for a complete kinematic description of the event.](https://arxiv.org/html/2603.09133v1/x16.png)
A new theoretical analysis delves into the subtle signatures of semileptonic decays to reveal potential deviations from established physics.
Science
Echoes of a Black Hole: Linking Ringdown’s Fading Signals
![The study verifies a critical relationship-dubbed the “bridge relation”-between the amplitude of quasi-normal modes and accumulated strain in the ringdown phase of binary black hole mergers, demonstrated through comparisons of Λ values extracted from simulations against theoretical predictions derived from amplitude ratios [latex]\mathcal{R}[/latex] across a range of remnant spin values.](https://arxiv.org/html/2603.07469v1/x3.png)
New research reveals a fundamental connection between the oscillatory ‘echoes’ and persistent distortions produced during black hole ringdown, offering a novel way to probe the limits of Einstein’s theory.
Ghostly Singularities in Light: How Boundaries Shape Wave Behavior
![The study demonstrates that within a defect waveguide, variations in the odd index [latex]n_0[/latex] induce a transition in light intensity decay, shifting from rapid dissipation at the exceptional point to emergent oscillatory dynamics as [latex]n_0[/latex] surpasses a value of 5, a phenomenon corroborated by both numerical solutions of coupled-mode equations and an approximate analytical expression.](https://arxiv.org/html/2603.07212v1/Fig3.png)
New research reveals that the edges of photonic structures can create unusual ‘exceptional points’-singularities in light propagation-without needing energy loss or gain.
Beyond Metals: A New State of Matter Emerges from Quantum Pairing
Researchers have predicted a novel phase of matter-a Weyl excitonic condensate-where topology and strong electron interactions give rise to unique properties and chiral edge states.
Echoes of the Event Horizon: Hunting for Quantum Clues in Black Hole Mergers
New research explores how subtle shifts in the orbits of objects spiraling into black holes could reveal quantum properties of spacetime itself.
Black Hole Horizons: A New Look at Spacetime and Stability
![The behavior of mass [latex]M(r_h)[/latex] as a function of [latex]r_h[/latex] reveals critical dependencies in the system's dynamics.](https://arxiv.org/html/2603.08222v1/x30.png)
New research delves into the interplay between gravity, electromagnetism, and non-abelian gauge fields to reveal how these forces shape the structure and thermodynamics of black holes.
From Vacuum Decay to Hadron Storms: Exploring the Schwinger Effect
A new review examines how the spontaneous creation of matter from intense fields-the Schwinger effect-is reshaping our understanding of nuclear physics and high-energy collisions.
Graphene Supercircuits Break Time’s Arrow
![The emergence of a finite supercurrent at [latex]\varphi = \pi[/latex] signals a time-reversal breaking instability within a coupled GJJ and LC quantum harmonic oscillator system, occurring within a specific parameter space defined by the coupling constant and temperature (expressed in units of [latex]\Delta\_{0}/k\_{\rm B}[/latex]), and demarcated by a critical temperature [latex]T\_{\mathrm{c}}[/latex], which numerical solutions-and an analytical estimate detailed in Eq. (22)-confirm captures the qualitative behavior of this spontaneous instability given fixed parameters of [latex]\hbar\omega\_{\mathrm{r}}=0.6\Delta\_{0}[/latex] and [latex]\mu\_{0}=10\hbar v\_{\mathrm{F}}/L[/latex].](https://arxiv.org/html/2603.07256v1/x7.png)
New research reveals how coupling graphene Josephson junctions to superconducting resonators can induce time-reversal symmetry breaking and create novel hybrid light-matter excitations.
Predicting the Future: A New Approach to Robust World Models
Researchers have developed a framework that enables agents to learn and generalize to unseen physical environments by actively exploring symmetries within those environments.
Cleaner Superconductors, Coherent Qubits: Tantalum’s Interface Matters
New research reveals a direct link between the quality of superconducting tantalum films and their performance in quantum circuits, demonstrating that interface engineering can dramatically reduce energy loss.