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.

Date Sujet#  Auteur
28 Jul 24 * Energy?41Stefan Ram
28 Jul 24 +- Re: Energy?1Ross Finlayson
28 Jul 24 +* Re: Energy?2J. J. Lodder
29 Jul 24 i`- Re: Energy?1Ross Finlayson
30 Jul 24 `* Re: Energy?37Ross Finlayson
30 Jul 24  +- Re: Energy?1Eddy Vadász
31 Jul 24  +* Re: Energy?13J. J. Lodder
31 Jul 24  i`* Re: Energy?12Maciej Wozniak
31 Jul 24  i `* Re: Energy?11gharnagel
31 Jul 24  i  +* Re: Energy?2J. J. Lodder
31 Jul 24  i  i`- Re: Energy?1Maciej Wozniak
31 Jul 24  i  `* Re: Energy?8Maciej Wozniak
1 Aug 24  i   `* Re: Energy?7gharnagel
1 Aug 24  i    +- Re: Energy?1Maciej Wozniak
2 Aug 24  i    `* Re: Energy?5J. J. Lodder
2 Aug 24  i     +* Re: Energy?3Maciej Wozniak
2 Aug 24  i     i`* Re: Energy?2Python
2 Aug 24  i     i `- Re: Energy?1Maciej Wozniak
2 Aug 24  i     `- Re: Energy?1Bobauk Guang Chou
31 Jul 24  `* Re: Energy?22Ross Finlayson
1 Aug 24   +- Re: Energy?1Ross Finlayson
3 Aug 24   `* Re: Energy?20J. J. Lodder
3 Aug 24    +* Re: Energy?2Maciej Wozniak
3 Aug 24    i`- Re: Energy?1Python
4 Aug 24    `* Re: Energy?17Ross Finlayson
4 Aug 24     +- Re: Energy?1Ross Finlayson
4 Aug 24     +* Re: Energy?10Thomas Heger
4 Aug 24     i+* Re: Energy?2Ross Finlayson
5 Aug 24     ii`- Re: Energy?1Thomas Heger
4 Aug 24     i`* Re: Energy?7gharnagel
4 Aug 24     i +* Re: Energy?4Ross Finlayson
4 Aug 24     i i`* Re: Energy?3gharnagel
4 Aug 24     i i +- Re: Energy?1Ross Finlayson
5 Aug 24     i i `- Re: Energy?1Verdell Muklevich Fung
4 Aug 24     i +- Re: Energy?1Maciej Wozniak
5 Aug 24     i `- Re: Energy?1Rictor Tatár
10 Aug 24     `* Re: Energy?5Thomas Heger
16 Aug 24      `* Re: Energy?4J. J. Lodder
16 Aug 24       +- Re: Energy?1Ross Finlayson
17 Aug 24       `* Re: Energy?2Thomas Heger
17 Aug 24        `- Re: Energy?1Dmitry Kalmár

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