Zwiebach Equation 9.80: Why M^2 = -p^2?

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SUMMARY

In the discussion regarding Zwiebach's Equation 9.80, the equation M^2 = -p^2 is established as a consequence of setting the speed of light (c) to 1 in natural units. This relationship is derived from Equation (2.72) on page 25 of Zwiebach's text, which clarifies the context of the equation. The participants confirm that this formulation is consistent within the framework of theoretical physics.

PREREQUISITES
  • Understanding of natural units in physics
  • Familiarity with the Zwiebach textbook on string theory
  • Basic knowledge of relativistic equations
  • Concept of momentum in theoretical physics
NEXT STEPS
  • Review the derivation of Equation (2.72) in Zwiebach's text
  • Study the implications of natural units in theoretical physics
  • Explore the relationship between mass and momentum in relativistic contexts
  • Investigate other equations in string theory that utilize similar formulations
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The discussion is beneficial for physics students, particularly those studying string theory, theoretical physicists, and anyone interested in the mathematical foundations of relativistic equations.

ehrenfest
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Homework Statement


Can someone explain to me why in the world Zwiebach sets M^2 = -p^2 in this equation? Even in natural units, that doesn't seem right.


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The Attempt at a Solution

 
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Equation (9.80) is just equation (2.72) page 25, with c set to 1.
 
I see. Thanks.
 

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