Space Time Interval: Expressions & Confusion

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Homework Help Overview

The original poster expresses confusion regarding the expression for calculating the spacetime interval, noting discrepancies between different sources. The subject area involves concepts from relativity and the mathematical formulation of spacetime intervals.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the conventions used in defining the spacetime interval, with some suggesting that the differences are based on arbitrary choices. Others raise questions about the implications of these conventions on the classification of intervals as time-like or space-like.

Discussion Status

The discussion is exploring the nature of conventions in physics, with some participants providing references to external resources for further clarification. There is an acknowledgment of the arbitrary nature of the conventions, but no consensus has been reached regarding the preferred expression.

Contextual Notes

Participants mention the importance of consistency in applying the chosen convention, indicating that the differences in expressions may not affect the underlying physics as long as one remains consistent.

Amith2006
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Homework Statement



I am bit confused about the expression for finding the space time intervel. Some books say it is,
(spacetime intervel)[tex]^{2}[/tex]=(time intervel)[tex]^{2}[/tex] - (space intervel)[tex]^{2}[/tex]
while some books say it is,
(spacetime intervel)[tex]^{2}[/tex]=(space intervel)[tex]^{2}[/tex] - (time intervel)[tex]^{2}[/tex]

Homework Equations





The Attempt at a Solution


 
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It's just a convention, pick one and stick to it. The physics will be the same.
 
As mentioned above it's just based on the adopted convention. http://en.wikipedia.org/wiki/Sign_convention#relativity - This wiki article on the sign conventions employed may help clear things up. It is something of an arbitrary choice though as long as you remain consistent.
 
Last edited:
The criteria for an intervel being time like or space like just get interchanged. Maybe it is not a universal fact as u say. Anyway, thanks guys.
 

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