The peculiar Jeans length

@inproceedings{Tsagas2021ThePJ,
  title={The peculiar Jeans length},
  author={Christos G. Tsagas},
  year={2021}
}
Large-scale bulk flows are commonplace in the universe. This means that observers living in typical galaxies, like our Milky Way, do not follow the mean universal expansion, but have peculiar velocities relative to it. Using relativistic linear cosmological perturbation theory, we show that bulk peculiar motions introduce a characteristic length scale. The latter is analogous to the familiar Jeans length and marks the threshold below which the linear kinematics, as seen by observers living… Expand
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