Energy?
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Sujet :
Energy?
De :
ram (at) *nospam* zedat.fu-berlin.de (Stefan Ram)
Groupes :
sci.physics.relativity
Date :
28. Jul 2024, 10:37:36
Autres entêtes
Organisation :
Stefan Ram
Message-ID :
<Energy-20240728103722@ram.dialup.fu-berlin.de>
In a chapter of a book, the author gives this relation for a
system with mass m = 0:
E^2/c^2 = p^"3-vector" * p^"3-vector"
. Then he writes, "This implies that either there is no particle
at all, E = 0, or we have a particle, E <> 0, and therefore
p^'3-vector' <> 0.".
So, his intention is to kind of prove that a particle without mass
must have momentum.
But I wonder: Does "E = 0" really mean, "there is no particle."?
300 years ago, folks would have said, "m = 0" means that there is
no particle! Today, we know that there are particles with no mass.
Can we be confident that "E = 0" means "no particle", or could there
be a particle with "E = 0"?
Here's the Unicode:
E²/c² = p⃗ · p⃗
and
|This implies that either there is no particle at all, E = 0, or we
|have a particle, E ≠ 0, and therefore p⃗ ≠ 0.
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