David

Conformally Invariant Quantum Hair as a Mechanism for Black Hole Information Recovery

Conformally invariant corrections to the effective action arising from integrated-out matter fields in large N systems produce a family of quantum hair configurations around Schwarzschild black holes that modulate the near-horizon stress tensor. These quantum hair solutions emerge naturally from boundary conditions selecting an Unruh-like asymptotic sector and provide a semiclassical mechanism by which information encoded during black hole formation could escape outside the event horizon, potentially addressing information loss without invoking firewall or remnant scenarios.

Synthetic Data and Ensemble Methods Recover Macro Accuracy in Long-Tailed Vehicle Color Recognition

Vehicle color recognition in surveillance systems suffers from severe class imbalance, where rare colors—operationally critical for identification—are underrepresented. This study combines synthetic minority-class augmentation via generative models (text-to-image and image-editing tools) with ensemble methods and modern visual representations to achieve 79.7% macro accuracy on the UFPR-VeSV dataset. The results demonstrate an 8.2 percentage point improvement over prior work, though human-level error analysis reveals fundamental limits in color-based identification due to inherent visual ambiguity in unconstrained surveillance imagery.

GW190521 and GW231123 Are Consistent with Cosmic Domain Walls, But BBH Remains Favored — With a Critical Degeneracy

Two anomalous gravitational-wave events, GW190521 and GW231123, whose extreme masses and spins strain standard binary black hole (BBH) stellar evolution models, are tested against a topological dark matter (TDM) interpretation using cosmic domain wall waveform templates fit to LIGO strain data. While the BBH hypothesis is individually favored by large Bayes factors (log₁₀B = 12.2 and 11.3), these margins are lower than expected from clean BBH injections, suggesting the TDM hypothesis is not fully ruled out. A novel joint-fit analysis across both events finds consistency with a single underlying scalar field — the first such multi-event TDM parameter coherence test. Critically, injected domain wall signals are systematically misclassified as BBH with high spin, revealing a morphological degeneracy that could systematically obscure genuine domain wall dark matter signals in GW data.

String Solving with Stabilization and Transducers (Technical Report)

Sophie Germain, mathématicienne extraordinaire: A story stranger than fiction

Hybrid Sketching Methods for Dynamic Connectivity on Sparse Graphs