- #1
Rasalhague
- 1,387
- 2
Is is a typo? The 1985 edition of Schutz: A First Course in General Relativity, p. 52, equation 2.37, which is supposed to express the idea that "photons have spatial momentum equal to their energy":
[tex]\vec{p} \cdot \vec{p} = -E^2 + E^2 = 0.[/tex]
Shouldn't this be
[tex]\vec{p} \cdot \vec{p} = E^2[/tex]
or
[tex]E^2 - \vec{p} \cdot \vec{p} = 0?[/tex]
[tex]\vec{p} \cdot \vec{p} = -E^2 + E^2 = 0.[/tex]
Shouldn't this be
[tex]\vec{p} \cdot \vec{p} = E^2[/tex]
or
[tex]E^2 - \vec{p} \cdot \vec{p} = 0?[/tex]