Beyond the Event Horizon: Probing Black Hole Spacetime
![The study demonstrates that for a rapidly spinning black hole with [latex] a_{\*} = 0.99 [/latex] and maximal deformation [latex] \ell_{\textrm{NP}} = 0.1137 [/latex], the horizon radius [latex] r_H(\theta) [/latex] deviates from that of a Kerr black hole, and the innermost stable circular orbit (ISCO) radius [latex] r_{\textrm{ISCO}} [/latex] is significantly altered as a function of spin and deformation-with parameter combinations leading to naked singularities excluded from the analysis.](https://arxiv.org/html/2602.16562v1/x2.png)
New research details a method for testing the predictions of Einstein’s theory of gravity using X-ray reflections from material swirling around black holes.
Science
The Fabric of Reality: Could Gravity Be an Illusion of Geometry?
New research suggests gravity isn’t a fundamental force, but an emergent property arising from the complex, fluctuating geometry of spacetime itself.
Neutrino Secrets at the Quantum Limit
![Neutrino flavor evolution, governed by parameters [latex]\bf{\lambda}[/latex], transforms a prepared neutrino state into a superposition of eigenstates, enabling a quantum metrology protocol where final flavor detection reveals insights into the oscillation process over time [latex]t[/latex].](https://arxiv.org/html/2602.16534v1/schema_misura_2.png)
A new analysis reveals the fundamental precision limits for measuring neutrino properties and uncovering the origins of matter-antimatter asymmetry.
Fragile Coherence: How Asymmetry Reveals Quantum Order
![The study reveals that asymmetry following a spin flip evolves predictably over time, with the rate of change-quantified as [latex]\delta\mathcal{S}(\rho\_{A},Z\_{A})=(\Delta S(\rho\_{A},Z\_{A})-\Delta S\_{0})/\log t[/latex]-scaling consistently across varying subsystem sizes, suggesting a universal characteristic of this dynamic process.](https://arxiv.org/html/2602.15969v1/x10.png)
New research explores the delicate balance between quantum clustering and macroscopic coherence in spin chains following a localized disturbance.
Strange New Worlds: Unlocking the Secrets of Kaon Production
This review explores the decades-long effort to understand how electromagnetic interactions create kaons from nucleons, revealing insights into the fundamental forces governing matter.
Spinning in the Dark: How Axions Could Influence Particle Systems
New research explores the collective behavior of spinning particles when exposed to hypothetical axion fields, revealing subtle forces with potential implications for dark matter detection.
The Feeling of Now: How Evolution Built Consciousness
A new framework proposes that consciousness isn’t a unique biological quirk, but an inherent property of systems driven to reduce uncertainty and predict the future.
Dark Matter’s Hidden Signal: A New Hunt in Protoplanetary Disks
![The study demonstrates that birefringence induced by hypothetical axion-like particles (ALPs) within protoplanetary disks causes a time-varying rotation χ of the polarization plane of scattered light, measurable through oscillations in local Stokes parameters [latex]Q_{\phi}[/latex] and [latex]U_{\phi}[/latex], and thus providing a potential signature for these elusive particles.](https://arxiv.org/html/2602.15611v1/x1.png)
Researchers are leveraging the polarization of light from swirling gas and dust around young stars to search for subtle signatures of elusive axion-like particles, a leading candidate for dark matter.
Sculpting Interactions with Light: A New Route to Quantum Simulation
Researchers have demonstrated a novel method for engineering interactions between atoms in a gas, paving the way for simulating complex quantum systems.
Beyond the Swampland: Infinite Fields and Higher Dimensions
New research explores whether non-compact gauge theories can escape theoretical constraints by leveraging an infinite number of fields, revealing a surprising link to the breakdown of effective field theory and potential decompactification.