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nlin.AO2026
Pink Noise in Economic Time Series from Synchronization and Amplitude Demodulation
Masahiro Morikawa, Yokoh Morikawa, Akika Nakamichi
Pink noise, characterized by a power spectral density with , appears in economic indices as well as in many natural systems. We summarize a unified mes…
astro-ph.HE2026
A Synchronized Spin Model for Black-Hole Accretion Systems
Masahiro Morikawa, Akika Nakamichi
Black-hole accretion systems exhibit a characteristic coexistence of activities: broad-band X-ray variability, hot coronae, wide-angle winds, and both steady and discrete jets. Thi…