Relativity and Cosmology


Unrealistic Assumptions Inherent in Maximal Extension

Authors: G.N.N.Martin

I argue that maximal extension makes improbable assumptions about future conditions. I start by looking at the Schwarzschild metric, and showing that it does not quite represent the exterior of a collapsed star, although it is easy to argue that the mismatch is immaterial. I then look at the collapse of a cloud of dust using the Robinson Walker metric, which might seem to justify using the Schwarzschild metric to describe the exterior of a black hole. I then show how the Schwarzschild metric is modified when the interior is a collapsed dust cloud, and finally show how the maximal extension of a Schwarzschild black hole makes unrealistic assumptions about the future.

Comments: 4 Pages.

Download: PDF

Submission history

[v1] 2017-04-19 10:09:41

Unique-IP document downloads: 29 times is a pre-print repository rather than a journal. Articles hosted may not yet have been verified by peer-review and should be treated as preliminary. In particular, anything that appears to include financial or legal advice or proposed medical treatments should be treated with due caution. will not be responsible for any consequences of actions that result from any form of use of any documents on this website.

Add your own feedback and questions here:
You are equally welcome to be positive or negative about any paper but please be polite. If you are being critical you must mention at least one specific error, otherwise your comment will be deleted as unhelpful.

comments powered by Disqus