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The Jeans mass is named after the British physicist Sir James Jeans, who considered the process of gravitational collapse within a gaseous cloud. He was able to show that, under appropriate conditions, a cloud, or part of one, would become unstable and begin to collapse when it lacked sufficient gaseous pressure support to balance the force of gravity.
Firehose instability (a.k.a. hose instability), not to be confused with the similarly named Firehose instability in galactic dynamics; Fish instability, Free electron maser instability, Gyrotron instability, Helical (Helix) instability, Jeans instability, [23] [24] Magnetic buoyancy instability. Interchange instability (a.k.a. flute instability ...
If the thermal motion of the electrons is ignored, it is possible to show that the charge density oscillates at the plasma frequency =, [/] (), =, [/] (), where is the number density of electrons, is the electric charge, is the effective mass of the electron, and is the permittivity of free space.
Sir James Hopwood Jeans OM FRS [1] (11 September 1877 – 16 September 1946 [2]) was an English physicist, mathematician and an astronomer.He served as a secretary of the Royal Society from 1919 to 1929, and was the president of the Royal Astronomical Society from 1925 to 1927, and won its Gold Medal.
Jeans Equation simulations place limits on the size of this halo. An example of such an analysis is given by the constraints that can be placed on the dark matter halo within the Milky Way. Using Sloan Digital Sky Survey measurements of our Galaxy, researchers were able to simulate the dark matter halo distribution using Jeans equations. [8]
After the instability has run its course, the system is typically "hotter" (the motions are more random) or rounder than before. Instabilities in stellar systems include: Bar instability of rapidly rotating disks; Jeans instability; Firehose instability [4] Gravothermal instability [5] Radial-orbit instability
In most of the photos, she's wearing baggy jeans, but one image in particular stood out to her followers. In the photo, EmRata, as she's affectionately known, stands in a pair of light-wash jeans ...
In the fields of nonlinear optics and fluid dynamics, modulational instability or sideband instability is a phenomenon whereby deviations from a periodic waveform are reinforced by nonlinearity, leading to the generation of spectral-sidebands and the eventual breakup of the waveform into a train of pulses.