1️⃣ Sgr A Polarization During the 2018 EHT Campaign
ALMA found low total intensity variability of Sgr A* (<10%) but much higher polarization variability (up to 50%). During an X-ray flare, a simultaneous millimeter peak contradicts standard delayed-flare models, pointing to continuous energy injection.
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2️⃣ Chaotic EMRI Migration in Turbulent Disks
Future gravitational wave detector LISA will observe objects spiraling into supermassive black holes (EMRIs). New research shows that disk turbulence makes their migration chaotic, noticeably affecting gravitational waveforms. The effect may be detectable at sufficient signal-to-noise ratios.
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3️⃣ Where Did the First Black Holes Come From?
JWST finds overly massive black holes in the first billion years — a challenge for theory. A new study compares three seeding scenarios: light (~100 M☉), heavy (~10³⁻⁵ M☉), and primordial. Only heavy-seed and primordial black hole models can simultaneously match all observations.
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4️⃣ Analytic Formulae for Binary Black Hole Populations
Symbolic regression produced compact closed-form expressions for key merger population properties from the GWTC-4 catalog: merger rates, spin distributions, mass ratios — now analyzable without complex numerical models.
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5️⃣ Planetary Exploration 3.0
NASA's incremental approach (22 Mars missions over decades) doesn't work for distant worlds. PE 3.0 proposes radically adaptive missions with software-defined systems and onboard AI that can autonomously change strategy in situ. Concepts include Neptune/Triton flyby and ocean world exploration.
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