I got bombed with a 2 yesterday. I will say the essays near the top are pretty good, with one notable exception IMO.
I am not that wedded to any particular thoery or paradigm. I tend to wear different hats at various times. By doing that I am freer to think about things. The one person who most often restricts a person's freedom is themselves.
In physics the so called fine tuning problem has two components. The first is from the Higgs field. The П†^4 theory has vertices with four "legs," which makes it the center of mass renormalization. For Оґ the cut-off scale mass renormalization terms are of the form (О»/Оґ^2)^n, which means that for a large number of diagrams they have to cancel properly at ~ 1/Оґ^2. We may then think of this scale as being from the mass scale of the Higgs ~ 200 GeV to the string or Planck scale of 10^{19}GeV which is about 16 or 17 orders of magnitude. We then have to get the theory tuned to within 1/Оґ^2 ~ 10^{-32} orders of magnitude.
We then of course have vacuum bubbles which give energy to the vacuum. This would not be a problem for QFT if we only dealt with energy differences. However, for gravitation we have that gravitation involves the absolute mass-energy in space and so from the cosmological constant of 10^{54}cm^{-{2} to the Planck scale curvature of 10^{66}cm^{-2} there is then a 10^{120} fine tuning issue. We may think of the vacuum as due to self-interacting П†^4 bubble, say two loops connected at a vertex. For the Higgs field this is О»/Оґ^4, which has 10^{64} to 10^{66} orders of magnitude fine tuning problem. This is of course from the Higgs scale to the Planck scale. If we include the low energy scale where the 3 Goldstone boson fields are absorbed as longitudinal degrees of freedom down the cosmological scale we then recover the quantum gravity fine tuning.
Of course this is pretty horrendous. However, if we can transform this problem into another guise it might be avoided, or at least ameliorated. This is to look as a soliton version of this theory. Consider the fermion, which in the Thirring fermon theory gives a sine-Gordon soliton for the condensate of that field. We then have that the fermion superfield with
ОЁ = П€ + C(Оё-barA + ОёA-bar) + ОёОё-barF
and the Thirring condensate giving the sine-Gordon dynamcs as
ОЁ в†' exp(ОЁОЁ).
This of course carries over to the scalar field as well, where the Higgs field is a condensate at the low energy domain with the important Higgs vev = Ој/2О». In this way the fine tuning with the Higgs field can be connected to the problem with gravitation.
Another way to think of it is Gauss' theorem and holography. The CFT on the AdS boundary, or the equivalent on a black hole horizon (holographic screen) is evaluated on a bounding surface. In the case of black holes with an inner and out horizon this is evaluated on two surfaces. In the bulk however, where one has gravitation, there is more than just the difference in energy. However, holography tells us, as really does Gauss' theorem, this should not be terribly relevant. The gravitational or cosmological fine tuning should be pinned to the field theoretic fine tuning. The QFT fine tuning is ultimately due to the Higgs field.
Cheers LC