高能暂现源 · 每日文献综述

Gravitational-wave detectors operate in inherently nonstationary environments, requiring robust detector characterization (DetChar) to distinguish instrumental transients from astrophysical signals. Traditional DetChar frameworks typically rely on morphological classifiers or energy-based projections, such as band-limited root-mean-square (BLRMS) metrics, which can conflate global amplitude scaling with physical reconfigurations of the spectrum. In this work, we introduce Fisher information velocity, a novel geometric channel that models the detector's power spectral density as a point on a Riemannian manifold. By tracking the kinematic drift of the noise floor and utilizing exterior algebra to calculate tangent divergence (<inline-formula><mml:math><mml:mi>sin</mml:mi><mml:mi>θ</mml:mi></mml:math></inline-formula>), we mathematically decouple simple energy surges from spectral warps, or differential redistributions of power across frequency bands. Applying this framework via the SGN-DRIFT streaming pipeline to <inline-formula><mml:math><mml:mo>~</mml:mo><mml:mn>40</mml:mn></mml:math></inline-formula> hours of high-cadence Advanced LIGO O4a data, we evaluate <inline-formula><mml:math><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>282</mml:mn></mml:math></inline-formula>, 080 independent manifold velocity samples. High-resolution phase space mapping reveals a bimodal taxonomy of severe instrumental nonstationarity, classifying events into structural pivots (87.2%) and isotropic surges (12.8%). Among codetected events, the geometric channel achieves higher significance than standard BLRMS monitors in 74% of cases with a median sensitivity ratio of <inline-formula><mml:math><mml:mi>Γ</mml:mi><mml:mo>=</mml:mo><mml:mn>1.65</mml:mn></mml:math></inline-formula>. The two channels detect largely nonoverlapping populations, increasing the total anomaly catalog by 87% over BLRMS alone. Systematic validation on 10 confirmed GWTC-4.0 events and <inline-formula><mml:math><mml:mo>~</mml:mo><mml:mn>5</mml:mn></mml:math></inline-formula>, 000 simulated injections demonstrates robust insensitivity to astrophysical signals, establishing this geometric channel as a sensitive, complementary, and veto-safe diagnostic for current and next-generation detector networks.

We use the latest ANTARES Galactic Ridge neutrino measurements to investigate their implications for indirect dark matter (DM) searches. We consider both annihilating and decaying DM scenarios, spanning a wide range of masses and final states, and systematically compare the resulting neutrino fluxes with the expected astrophysical Galactic diffuse emission. Furthermore, we compare the results for different DM density profiles allowed by the observations, from spike and cuspy to cored profiles. We do so for the WIMP model-independent scenario and explore two more specific models: branons and very heavy sterile neutrinos, where a cold DM candidate arises naturally from the theory. We show the potential neutrino measurements in the Galactic Ridge for DM and make predictions for future neutrino observatories.