What is the Definition of Continuity in Minkowski Space?

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Discussion Overview

The discussion revolves around the definition of "continuity" for maps in Minkowski space, focusing on the appropriate metrics and topologies to use. Participants explore the implications of different definitions and the nature of continuity in this context, touching on theoretical aspects and mathematical foundations.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the use of the Minkowski product for defining continuity, suggesting it may misrepresent point proximity.
  • Another participant asserts that Minkowski space-time can be viewed as ##\mathbb{R}^{4}## with the canonical Euclidean topology, indicating that continuity should be defined with respect to this topology.
  • A participant references the Wikipedia definition of Minkowski space and inquires whether a consistent metric can be induced by the quadratic form associated with it, suggesting reliance on the Euclidean norm for continuity if not.
  • Another participant notes that while pseudo-Riemannian metric tensors can theoretically induce a topology, the canonical topology on Minkowski space-time is generated by the Euclidean metric's open balls.
  • A later reply mentions a mathematical book that discusses topology in Minkowski spacetime, potentially providing further insights.

Areas of Agreement / Disagreement

Participants express differing views on the appropriate metrics and topologies for defining continuity in Minkowski space. There is no consensus on a singular definition or approach, and multiple competing perspectives remain present in the discussion.

Contextual Notes

Participants highlight the limitations of using the Minkowski product for continuity and the potential need for alternative metrics, indicating unresolved questions about the nature of continuity in this mathematical framework.

cosmic dust
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How "continuity" of a map Τ:M→M, where M is a Minkowski space, can be defined? Obviously I cannot use the "metric" induced by the minkowskian product:
x\cdoty = -x^{0}y^{0}+x^{i}y^{i}
for the definition of coninuity; it is a misinformer about the proximity of points. Should I use the Euclidean metric instead?

Thank's...
 
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Minkowski space-time is just ##\mathbb{R}^{4}## with the canonical Euclidean topology. Continuity of endomorphisms of Minkowski space-time is with respect to this topology.
 
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I took the wikipedia's definition of Minkowski space: a 4-D real vector space with a symmetric, bilinear, non-degenerate quadratic form with signature (1,3). From this point of view, can a consistent metric induced by that quadratic form? If not, then according to your comment, I will have to make use and of the Eucliden norm on that vector space, in order to define continuity.

Right?
 
cosmic dust said:
I took the wikipedia's definition of Minkowski space: a 4-D real vector space with a symmetric, bilinear, non-degenerate quadratic form with signature (1,3). From this point of view, can a consistent metric induced by that quadratic form? If not, then according to your comment, I will have to make use and of the Eucliden norm on that vector space, in order to define continuity.
I've never seen pseudo-Riemannian metric tensors on vector spaces being used to induce a topology on the vector space but that's not to say that it isn't defined (you can define it in the same way). The canonical topology on Minkowski space-time would just be that generated by the base of open balls of the Euclidean metric yes. There are other topologies you can endow as well of course and they don't have to stem from a metric.
 
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The beautiful [math] book "The Geometry of Minkowski Spacetime: An Introduction to the Mathematics of the Special Theory of Relativity" by Naber has an appendix that discusses topology for Minkowski spacetime.
 

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