Re: Positrons

Liste des GroupesRevenir à sp relativity 
Sujet : Re: Positrons
De : ram (at) *nospam* zedat.fu-berlin.de (Stefan Ram)
Groupes : sci.physics.relativity
Date : 08. Jul 2025, 20:57:02
Autres entêtes
Organisation : Stefan Ram
Message-ID : <mass-20250708205259@ram.dialup.fu-berlin.de>
References : 1 2 3 4 5 6 7
"Paul.B.Andersen" <relativity@paulba.no> wrote or quoted:
E_1 = E_0 "Energy is conserved"
p_1 = p_0 "momentum is conserved"
m_1 < m_0 "mass is converted into energy"
Please explain why these three assumptions are not compatible with:
e⁺ + e⁻  →  γ + γ

  Well, "energy", "momentum", and "mass" are /vague terms/. One needs
  to specify the energy (momentum, mass) /of what/ one refers to.

  If one would try to correct the vagueness of "mass is converted into
  energy" by saying, "the mass of 'γ + γ' is smaller than the mass
  of 'e⁺ + e⁻'" (thereby saying "of what"), then this would be wrong.

m₀ = 2m, m₁ = 0

  Well, this is the same point: It's too vague because the system
  is not specified. The mass of what system is "m_0"? The mass of
  what system is "m_1"? So, to quote Dirac, it's not even wrong!

  But, if I assume that m_0 is the mass of "e⁺ + e⁻", then it's
  wrong, because when they move in their COG system m_0 > 2m
  (assuming m to be the mass of an e⁺ or e⁻ in its COG system)
  if they are moving with a non-zero speed in the COG.

  And m_1 surely is larger than 2*0 (two times the mass of
  a photon). For one illustration: The mass of a gluon is 0.
  Yet the kinetic energy of gluons make up for 37 percent of the
  /mass/ of a proton. You don't get this value of .37*m_p if you
  take the mass of each gluon in isolation and then sum them up.

  No, wait, it was Pauli, not Dirac!
 

Date Sujet#  Auteur
6 Jul05:27 * Re: Positrons19Bertietaylor
7 Jul19:40 +* Re: Positrons14Paul.B.Andersen
7 Jul19:53 i+- Re: Positrons1Athel Cornish-Bowden
7 Jul22:20 i+- Re: Positrons1Maciej Woźniak
7 Jul23:02 i+* Re: Positrons9Stefan Ram
8 Jul13:57 ii`* Re: Positrons8Paul.B.Andersen
8 Jul15:17 ii `* Re: Positrons7Stefan Ram
8 Jul20:38 ii  `* Re: Positrons6Paul.B.Andersen
8 Jul20:57 ii   `* Re: Positrons5Stefan Ram
8 Jul21:16 ii    +* Re: Positrons2Stefan Ram
8 Jul22:19 ii    i`- Re: Positrons1Stefan Ram
9 Jul18:43 ii    `* Re: Positrons2Paul.B.Andersen
9 Jul19:32 ii     `- Re: Positrons1Stefan Ram
8 Jul20:50 i`* Re: Positrons2Aether Regained
9 Jul20:29 i `- Re: Positrons1Aether Regained
8 Jul21:00 `* Re: Positrons4Aether Regained
8 Jul23:45  +- Re: Positrons1William Hyde
9 Jul06:27  `* Re: Positrons2Thomas Heger
9 Jul20:24   `- Re: Positrons1Aether Regained

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