Jack Sarfatti has constructed a physics model with two basic structures:

- "... negative energy virtual electron Dirac Sea [that] is unstable and forms the Higgs Ocean with the Vacuum ODRLO PSI ... B = ( Lp / 2 pi ) "dArgPSI" ..."
- "... B is also the ... local gauge potential from local gauging of T4 to Diff(4) ... Einstein's emergent curved space time is from the EEP g(curved) = (I+B) (Minkowski ((I+B) ...[where]... The Einstein-Cartan Tetrad 1-form is e = I+B ...[and]... I = Identity ..." with I corresponding to the Minkowski Rotations and Boosts.

In my opinion,

However, I think that Jack's model can be refined a bit to be even more realistic as follows:

1 - Make a Nambu-Jona-Lasinio (NJL) model with T-quark condensate playing the role of Jack's "negative energy virtual electron Dirac Sea". The Planck Length Lp emerges from NJL as the compositeness scale of the T-quark-antiquark pair Higgs condensate.

2 - Make a MacDowell-Mansouri gravity (MCDM) model in which the 4 anti-deSitter translations form the metric of Einstein gravity, just as in Jack's model.

3 - Combine NJL and MCDM by

- looking first at the NJL and seeing that at the Planck scale of the T-quark-antiquark condensate compositeness each quark-antiquark Cooper-type pair is a spinor-antispinor pair that in 4 dimensions corresponds to a 4-dimensional vector ( as in a spinor being a square root of a vector )
- which vector is naturally defined with respect to an underlying 4-dimensional Minkowski physical spacetime
- which Minkowski (I+B) after gauging gives gravity by MCDM.

The NJL T-quark-antiquark Higgs condensate acts through B on the MCDM gravity to effectively curve physical spacetime, which explains the connection between Higgs and Mass.

Here are some of my further comments:

The discussion above works well for an 8-dimensional spacetime reducible to a 4-dimensional Mindkowski physical spacetime plus a 4-dimensional CP2 internal symmetry space.

Pure NJL is non-renormalizable, but by adding gauge interactions and a 4-Fermi interaction (gauged 4F NJL) you get renormalizability. Further, you can eliminate the need for the 4-Fermi interaction by going to an 8-dim Kaluza-Klein NJL, and such an 8DKKNJL is really quite realistic. I like 8DKKNJL because it shows how Jack's model and my model are mutually consistent and fit together nicely.

Jack's "... toy model with G / H = S1 ..." might in a more nearly
realistic version be G / H = Spin(2,3) / Spin(1,3) = anti-deSitter /
Lorentz, in which case MCDM variation of B would lead to the usual
**Poincare/anti-deSitter phase** of ordinary spacetime such as
prevails within the orbit of Uranus.

Another realistic version might be use G = Spin(2,4) = SU(2,2) =
Conformal Group, in which case MCDM variation of B would lead to the
**Segal conformal gravity****
phase** of expanding spacetime such as prevails outside the orbit
of Uranus.

**Those 2 phases** (with transition at the orbit of Uranus)
explain the Pioneer anomalous
acceleration, and are the underlying basis for Jack's 2-phase
Hedgehog explanation of the
Pioneer anomalous acceleration.

Since I think that Jack's construction of gravity from the B of I+B is equivalent to MCDM, and since MCDM is well known to produce spin-2 gravitons, I think that Jack's model does in fact effectively have spin-2 gravitons. However, Jack is correct when he says "... Quantized Gloldstone vibrations in argPSI are not spin 2 gravitons ..." because the NJL Goldstone bosons are the Higgs bosons.

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