- In the TGD framework, the fundamental principle determining physics as geometry is that the infinite-dimensional geometry of the "world of classical worlds" (WCW) exists mathematically. Physics is unique because of its mathematical existence and has maximal symmetries. Freed demonstrated that for the loop spaces this geometry is unique and indeed has an infinite-D group of isometries (Kac-Moody symmetries).
- 4-D general coordinate invariance is essential in TGD and implies holography in reducing to a generalization of 2-D holomorphy to 4-D case,
which in turn corresponds to 4-D quantum criticality.
- The first guess would be that WCW consists of 3-D surfaces in M
^{4}×CP_{2}: M^{4}×CP_{2}is indeed unique by several mathematical arguments and also by standard model symmetries. 3-surface generalizes the notion of a point-like particle. - 4-D general coordinate invariance requires that a given 3-surface corresponds to a
*nearly*unique 4-surface in M^{4}×CP_{2}. This means holography, or equivalently, Bohr orbitology. WCW also has interpretation as a space of 4-D analogs of Bohr orbits. Quantum TGD becomes the analogue of wave mechanics in WCW.Note that in atomic physics this would mean the replacement of electrons configuration space E

^{3}with the space of its Bohr orbits: this would be fiber space over E^{3}with fiber at given point consisting of Bohr orbits through it.

- The first guess would be that WCW consists of 3-D surfaces in M

- For 2-D systems conformal invariance implying holomorphy of string orbits extends to 4-D analog of holomorphy, which realizes quantum criticality in 4-D case. Holomorphy implies holography! Field equations reduce to a purely algebraic form, having no dependence on the coupling parameters of the action as long as it is general coordinate invariant and constructible using the induced geometry.
- This happens outside 3-D and lower-D singularities. Space-time surface is a minimal surface, analog of a soap film spanned by frames. Minimal surface property is analog of massless field equations at field level and analog of massless geodesic property at particle level. The classical and quantum dynamics distinguishes between different actions only at the frames, which can depend on action.

- In Quantum TGD, wave functions of the ordinary wave mechanics are replaced with analogs of wave functions in WCW (WCW spinor fields as many-fermion states as WCW spinors) consisting of analogs of Bohr orbits. This forces a new ontology: I call it zero energy ontology (ZEO) forcing a new view of quantum measurement.
- In state function reduction (SFR) this kind of superposition inside quantization volume (causal diamond (CD) is replaced with a new one, and also the size and other parameters characterizing the CD can change. The standard paradox of quantum measurement theory disappears.
- There are two kinds of SFRs.
- In small SFRs (SSFRs), the boundary of CD is stationary and states at it are not affected but the active boundary is shifted and CD tends to increase. The sequences of SSFRs correspond to Zeno effect, having no effect in standard QM, and give rise to a conscious entity, self for which subjective time as sequence of SSFRs correlates with the increase of the distance between tips of CD.
- In big SFRs (BSFRs), the arrow of time changes so that the active boundary of the CD becomes passive and vice versa. BSFRS correspond to ordinary SFRs. BSFR means "death" of self and reincarnation with an opposite arrow of time. Even small perturbations can induce BSFR by affecting the set of the observables measured in SSFR: if the new set does not commute with those defining the passive states, BSFR unavoidably occurs.
- BSFRs give rise to self-organized quantum criticality. Self lives at criticality against death! As a consequence, the flow of consciousness of self has gaps with a distribution of gap durations. This is known for human consciousness.

- Paradoxically, this continual short term dying in BSFRs makes it possible for the system able to survive and correct behaviors. Self can also learn of avoidable behaviors by trial and error. Self can learn moral and ethical rules: do not do anything destroying quantum coherence! Perhaps most of the learning is by this method. Homeostasis is a basic implication. The system is at quantum criticality at the top of a hill and unstable. When it starts to fall down, it makes BSFR in some scale and changes the arrow of time and returns back near criticality. Self-organization, say spontaneous generation of molecules from their building bricks, can be understood as a time reversed dissipation.

- The half Virasoro algebra V with non-negative conformal weights serves as a simplified example. V contains an infinite set of sub-algebras V
_{k}for which conformal weights are divisible by integer k=1,2,,... One also obtains inclusion hierarchies ⊂ V_{k(n)}⊂ V_{k(n+1)}⊂ .. such that k(n) divides k(n+1), whose generalizations are very relevant to quantum TGD. - The ordinary realization of conformal symmetries is as a gauge symmetry for which the generators L
_{n}, n> 0, annihilate the physical states. One can however generalize this and only assume that V_{k}and [V_{k},V] annihilate the physical states. In this case, the generators L_{n}, n<k do not annihilate the states and act as genuine symmetries. Gauge symmetries are broken but have transformed to genuine physical symmetries! This removes the paradox from the idea of emergence of symmetries by symmetry breaking!

See for instance the article TGD view of Michael Levin's work .

For a summary of earlier postings see Latest progress in TGD.

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