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- Xref: sparky sci.physics:22045 alt.sci.physics.new-theories:2679
- Newsgroups: sci.physics,alt.sci.physics.new-theories
- Path: sparky!uunet!well!sarfatti
- From: sarfatti@well.sf.ca.us (Jack Sarfatti)
- Subject: Feynman 45 - gravity cut-off in QED has zero bare mass and charge
- Message-ID: <C09nKM.4J6@well.sf.ca.us>
- Sender: news@well.sf.ca.us
- Organization: Whole Earth 'Lectronic Link
- Date: Sun, 3 Jan 1993 07:02:46 GMT
- Lines: 79
-
-
- Feynman 45,renormalization of charge by vacuum polarization and a
- conjecture on the nature of cosmological dark matter and that quantum
- gravity creates mass and charge of electron from zero rather than infinite
- bare values!. Part VII
-
- Recall from the last lecture that:
- "One can imagine that the closed loop path of the positron-electron
- produces a (vacuum polarization) current
-
- 4piju = JuvAv (31)
-
- (uv are here are not electron spinors but Lorentz indices ranging from 1 to
- 4 with summation convention on RHS of 31)
-
- which is the source of the virtual photons which act on the second
- electron. One sees .. that
-
- Juv = S{Tr[(pa/+q/-m)^-1 G(pa/-m)^-1G]d^4pa (32)
-
- diverges very badly. The modification of D to f alters the amplitude with
- which the vacuum polarization current will affect the scattered real
- electron , but it can do nothing to prevent the divergence.
-
- .......
-
- A method of making (32) convergent without spoiling the gauge invariance
- has been found by Bethe and by Pauli. The convergence factor for light can
- be looked upon as the result of a superpostion of the effects of quanta of
- various masses (some contributing negatively) ... likewise (i.e. the
- convergence factor for electrons) if we we take the factor C(p^2 - m^2) = -
- @^2(p^2 - m^2 -@^2)^-1 so that (p^2 - M^2)^-1C(p^2 - m^2) = (p^2 - m^2)^-1
- - (p^2 - m^2 - @^2)^-1 we are taking the difference of the result for
- electrons of mass m and mass (@^2 + m^2)^1/2. But we have taken this
- difference for each propagation between interactions with photons.... That
- is, if ...(32) integrated over some finite range of p is called Juv(m^2),
- but with m replaced by (@^2 + m^2)^1/2 is called Juv((@^2 + m^2)^1/2) we
- should calculate (32')
-
- Juv^P = S(0 to infinity)[Juv(m^2) - Juv((@^2 + m^2)^1/2)]G(@)d@ ... then
- ... the range of p integration can be extended to infinity as the integral
- now converges.....(33) is an explicit gauge invariant solution for JuvP.
- See original paper. The formal statement of U(1) em gauge invariance in 4-
- momentum space is
-
- qu(quqv - q^2duv) = 0. There is a term -(1/3)(ln(@^2/m^2)(quqv-q^2duv)
- which "gives a current proportional to the current producing the potential.
- This would have the same effect as a change in charge, so that we would
- have a difference de^2 between e^2 and the experimentally observed
- (squared) charge e^2 + de^2, analogous to the (self-energy) difference
- between m and the observed mass. This charge depends logarithmically on the
- cut-off, de^2/e^2 = -(2e^/3pi)ln(@/m). After this renormalization of charge
- is made, no effects will be sensitive to the cut-off" There is a second
- more complicated cut-off independent term in the vacuum response function
- Juv.
-
- *Suppose we use the same gravity cut-off we did in the mass renormalization
- of of the self-energy of the electron in which all the mass of the electron
- is caused by gravity or curvature - as it should be.
-
- @^2/m^2 is 10^-10/10^-54 = 10^44 so ln@^2/m^2 is order of 44/loge = 44/.43
- = 102 and e^2 is 1/137 so de^2/e^2 is very roughly .16 and de/e is .4 - not
- bad! It may be that a more accurate calculation with more Feynman diagrams
- using the gravity cut-off gives both mass and charge starting from the idea
- of zero bare mass and zero bare charge! In standard QED the bare quantities
- are infinite.*
-
- *What does Feynman mean, in the case of the convergence factor for light
- only, by "some contributing negatively" does that mean spin 1 vector
- particles with the wrong Fermi-Dirac statistics like the Faddeev-Popov
- ghosts? The ghosts do not exist asymptotically as real particles - but
- perhaps that is a mistake - perhaps they compose the cosmological dark
- matter which is more than 90% of the mass of the universe. This dark matter
- would be superluminal in real time and transluminal in imaginary time which
- is orthogonal to real time but co-existent in a "shadow universe"?*
-
-
-
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-