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- Path: sparky!uunet!well!sarfatti
- From: sarfatti@well.sf.ca.us (Jack Sarfatti)
- Subject: Feynman 44 Is it unitary? Sarfatti predicts new solid state release of vacuum energy based upon Feynman's musings in 1949?
- Message-ID: <C044xC.3v0@well.sf.ca.us>
- Sender: news@well.sf.ca.us
- Organization: Whole Earth 'Lectronic Link
- Date: Thu, 31 Dec 1992 07:32:00 GMT
- Lines: 93
-
-
- Feynman 44 QED & renormalization Part VI Feynman has problems with
- unitarity and gauge invariance. Sarfatti introduces new idea to release
- vacuum energy in solid state physics - it is right?
- 7. The problem of vacuum polarization
- the virtual electron-positron pairs not included in above radiative
- corrections to scattering which only dealt with virtual photons emitted and
- reabsorbed on the electron worldlines.
-
-
- / real electron p2 hit by virtual photon
- /
- virtual photon /
- G ______________/ G
- /\ |
- pa+q / \ pa |
- \ / |
- \/ A | real electron p1
- virtual pair "closed loop"
-
- This is the biggest vacuum polarization Feynman diagram in 4-momentum
- space. I shall paraphrase a little - the quotes are loose - see original
- paper for details.
-
- "The potential Ae^-iqx creates a pair of electrons of momenta pa, -pb. This
- pair then reannihilates, emitting a quantum q = pa-pb, which quantum
- scatters the original electron from state 1 to state 2. The matrix element
- for this process ... is (30)
-
- -(e^2/ipi)(uad2Gu1)S{Tr[(pa/+q/-m)^-1 G(pa/-m)^-1G]d^4pa q^-2 C(q^2)A
-
- ... the potential produces the pair with amplitude proportional to AG, the
- electrons of momenta pa and -(pa+q) proceed from there to annihilate
- producing a quantum (factor G) which propagates (factor q^-2C(q^2)) over to
- the other electron, by which it is absorbed (matrix element of G between
- states 1 and 2 of the original electron, i.e., (uad2Gu1),. All momenta pa
- and spin states of the virtual electron pair are admitted which means the
- trace and the d^4pa integral are calculated.
-
- 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 ....
-
- ***The closed loops are a consequence of the usual hole theory in
- electrodynamics (i.e., vacuum structure is a filled Fermi sea of negative
- energy electrons propagating forward in time. Lift a negative FIT energy
- electron into a positive energy FIT state and the hole left behind is a
- postive energy FIT positron - this is the Dirac picture of the QED vacuum
- structure. It is similar to non-relavistic ground state of a simple metal
- in solid state physics. The Pauli exclusion principle makes the vacuum
- stable. Changing the quantum statistics from Fermi to Bose by changing
- dimension from 3+1 to 2+1 using slabs or "quantum wells" would appear to
- make the metallic ground state unstable inducing a first order phase
- transition releasing energy? -Sarfatti note of 12/30/92)***
-
- Was that an unanticipated telepatype - a message from the future?
-
- Back to Feynman:
- "The closed loops are .... required to keep probability conserved. The
- probability that no pair is produced by a potential is not unity and its
- deviation from unity arises from the imaginary part of Juv. Again with
- closed loops excluded, a pair of electrons once created cannot be
- annihilated, the scattering of light by light would be excluded etc.....
-
- To be sure, it is always possible that these matters of probability
- conservation will work themselves out as simply in the case of interacting
- charges as for those in a fixed potential...It would be interesting to
- calculat the Lamb shift accurately enough to be sure that the 20 megacylce
- expected from vacuum polarization are actually present" Remember this is
- 1949! Feynmen then talks of intruducing still another convergence factor
- for the electrons but he cautions that "the result is unsatisfactory"
- because it violates gauge invariance (i.e. local conservation of electric
- charge).
-
- to be continued
-
-
-
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-