Squared length of 4-momentum g(p,p)?

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    4-momentum Length
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SUMMARY

The squared length of 4-momentum, denoted as p^2, is defined as p dot p, which equals -m^2 in the context of special relativity. This relationship is contingent upon the choice of metric and the units employed, specifically highlighting that in "natural" units where c=1, the equation simplifies to p^2 = -m^2. This clarification addresses the common confusion regarding the inclusion of c^2 in the equation.

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Homework Statement
Can someone explain why the squared length of p^2 = p dot p = -m^2 and not -m^2*c^2?
Relevant Equations
p^2 = p dot p = -m^2
Explained in statement.
 
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That depends on two things:
1. What is the metric you use

2. What are the units you are using.
 

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