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Everything about Isotropic coordinates

Coordinate system used to represent certain spacetimes

In the theory of Lorentzian manifolds, spherically symmetric spacetimes admit a family of nested round spheres. There are several different types of coordinate chart which are adapted to this family of nested spheres; the best known is the Schwarzschild chart, but the isotropic chart is also often useful. The defining characteristic of an isotropic chart is that its radial coordinate is defined so that light cones appear round. This means that, the angular isotropic coordinates do not faithfully represent distances within the nested spheres, nor does the radial coordinate faithfully represent radial distances. On the other hand, angles in the constant time hyperslices are represented without distortion, hence the name of the chart. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Isotropic coordinatesA 5-minute orientation
  2. Skim a recent paper: The isotropic relaxed micromorphic model in polar coordinates and its application to an elastostatic axisymmetric extension problemInfluential work since 2022
  3. Pick up a classic book: Stochastic Structural DynamicsThe most-reprinted book on the subject
  4. Read the landmark paper: New algorithms to obtain analytical solutions of Einstein’s equations in isotropic coordinatesCited 58 times
  5. Go sideways: Gaussian polar coordinatesA closely related topic
  6. Go sideways: Spherically symmetric spacetimeA closely related topic

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