= Takashi Nakamura
{c}
<Takashi Nakamura>, with <Takenori Nakano>, analyzed the <gravitational instability> of an isothermal gaseous disk threaded perpendicularly by a frozen-in <magnetic field>. Their 1978 <linear stability analysis> showed how magnetic support changes whether perturbations can collapse.<Gravitational Instability of Magnetized Gaseous Disks by Takenori Nakano and Takashi Nakamura>[Abstract: perpendicular frozen field and perturbation stability]{ref}
The competition is scale dependent: gas <pressure> stabilizes sufficiently short <wavelengths>, while the <mass-to-flux ratio> determines whether gravity can overcome magnetic support at larger scales.
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