Eddington Finkelstein coordinates in the Schwarzschild spacetime

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Discussion Overview

The discussion revolves around the coverage of the Schwarzschild spacetime using Eddington-Finkelstein coordinates, specifically whether these coordinates allow for the maximal analytic extension of the spacetime and what regions they encompass.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • Some participants propose that Eddington-Finkelstein coordinates cover the entire manifold of Schwarzschild spacetime except for the singularity at r=0.
  • Others argue that Eddington-Finkelstein coordinates only cover half of the maximal analytic extension of Schwarzschild spacetime, with ingoing and outgoing coordinates covering different but overlapping halves.
  • A participant notes that if "Eddington-Finkelstein coordinates" is mentioned without specification, it typically refers to the ingoing coordinates.
  • There is a mention of differing labels for regions of spacetime between sources, such as Poisson and Wald.
  • A participant later expresses uncertainty about their previous answer, indicating a potential error.

Areas of Agreement / Disagreement

Participants express competing views regarding the extent to which Eddington-Finkelstein coordinates cover the Schwarzschild spacetime, indicating that the discussion remains unresolved.

Contextual Notes

There are references to specific sections in literature that may provide additional context, but the discussion does not resolve the differences in interpretation or the implications of the coordinate systems.

vitaniarain
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Do the Eddington-Finkelstein coordinates allow to cover the maximal analytic extension of the Schwarzschild spacetime? ans if not what region do they cover?
 
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They cover the entire manifold except for the "true" singularity at r=0.
 
vitaniarain said:
Do the Eddington-Finkelstein coordinates allow to cover the maximal analytic extension of the Schwarzschild spacetime? ans if not what region do they cover?

Eddington-Finkelstein coordinates cover only half of the maximal analytic extension of Schwarzschild spacetime. Take a look at section 5.1.3 in Eric Poisson's notes,

http://www.physics.uoguelph.ca/poisson/research/agr.pdf.

Better yet, see if your library has a copy of the excellent book, A Relativist's Toolkit: The Mathematics of Black Hole Mechanics, into which the notes evolved.

Ingoing Eddington-Finkelstein coordinates cover half of the maximal analytic extension of the Schwarzschild spacetime, and outgoing Eddington-Finkelstein coordinates cover half of the maximal analytic extension of the Schwarzschild spacetime. Note that:

1) these are two different coordinate systems;

2) they cover different, but overlapping, halves of spacetime;

3) If "Eddington-Finkelstein coordinates" appears without either "ingoing" or "outgoing", than "ingoing" is usually meant;

4) Poisson labels the regions of spacetime differently than does Wald.
 
Last edited:
Sorry about my above answer, I think I am in error.
 
Thank you for your answers and help!
 

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