How detailed the quantum classical correspondence can be?
Can the dynamics defined by preferred extremals of Kähler action be dissipative in some sense? The generation of the arrow of time has a nice realization in zero energy ontology as a choice of welldefined particle numbers and other quantum numbers at the "lower" end of CD. By quantum classical correspondence this should have a spacetime correlate. Gradient dynamics is a highly phenomenological realization of the dissipative dynamics and one must try to identify a microscopic variant of dissipation in terms of entropy growth of some kind. If the arrow of time and dissipation has spacetime correlate, there are hopes about the identification of this kind of correlate.
Quantum classical correspondence has been perhaps the most useful guiding principle in the construction of quantum TGD. What is says that not only quantum numbers but also quantum jump sequences should have spacetime correlates: about this the failure of strict determinism of Kähler action gives good hopes. Even the quantum superposition  at least for certain situations  might have spacetime correlates.
 Measurement interaction term in the modified Dirac action at the upper end of CD indeed defines a coupling to the classical dynamics kenociteallb/Dirac in a very delicate manner. This kind of measurement interaction is indeed basic element of quantum TGD. Also the color and charges and angular momentum associated with the Hamiltonians at point of braids could couple to the dynamics via the boundary conditions.
 The braid strand with a given Hamiltonian could obey Hamiltonian equations of motion: this would give rise to a skeleton of spacetime defined by braid strands possibly continued to string world sheets and would provided different realization of quantum classical correspondence. Symplectic tringulation suggests by the symplectic QFT proposed to describe physics in zero modes would add to the skeleton edges connecting string ends continued to 2D sheets in the interior of spacetime.
 Quantum TGD can be regarded as a square root of thermodynamics in welldefined sense. Could it be possible to couple the Hermitian square root of density matrix appearing in Mmatric and characterizing zero energy state thermally to the geometry of spacetime sheets by coupling it to the classical dynamical via boundary conditions depending on its eigenvalues? The necessity to choose single eigenvalue spoils the attempt and one obtains only a representation for single measurement outcome. It seems that one can achieve only a representation of the ensemble at spacetime level consisting of spacetime sheets representing various outcomes of measurement. This ensemble would be realized as ensemble of subCDs for a given CD.
 One can pose even more ambigious question: could quantum superposition of WCW spinor fields have a spacetime correlate in the sense that all spacetime surfaces in the superposition would carry information about the superposition itself? Obviously this would mean selfreferentiality via quantumclassical feedback.
The following discussion concentrates on possible spacetime correlates for the quantum superposition of WCW spinor fields and for the arrow of time.
 It seems difficult to imagine spacetime correlate for the quantum superposition of final states with varying quantum numbers since these states correspond to quantum superpositions of different spacetime surfaces. How could one code information about quantum superposition of spacetime surfaces to the spacetime surfaces appearing in the superposition? This kind of selfreferentiality seems to be necessary if one requires that various quantum numbers characterizing the superposition (say momentum) couple via boundary conditions to the spacetime dynamics.
 The failure of nondeterminism of quantum dynamics is behind dissipation and strict determinism fails for Kähler action. This gives hopes that the dynamics induces also arrow of time. Energy nonconservation is of course excluded and one should be able to identify a measure of entropy and the analog of second law of thermodynamics telling what happens at for preferred extremals when the situation becomes nondeterministic. The vertices of generalized Feynman graphs are natural places were nondeterminism emerges as are also subCDs.
Naive physical intuition would suggest that dissipation means generation of entropy: the vertices would favor decay of particles rather than their spontaneous assembly. The analog of blackhole entropy assignable to partonic 2surfaces might allow to characterize this quantatively. The symplectic area of partonic 2surface could be a symplectic invariant of this kind.
 Could the mysterious branching of partonic 2surfaces obviously analogous to even more mysterious branching of quantum state in many worlds interpretation of quantum mechanics assigned to the multivalued character of the correspondence between canonical momentum densities and time derivatives of H coordinates allow to understand how the arrow of time is represented at spacetime level? Recall that this brancing is what implies the effective hierarchy of Planck constants as integer multiples of its minimal value absolutely crucial for the application of TGD in biology and consciousness and to the understanding of dark matter as large hbar phases
 This branching would effectively replace CD with its singular covering with number of branches dependin on spacetime region. The relative homology with respect to the upper boundary of CD (so that the branches of the trees would effectively meet there) could define the analog of Floer homology with various paths defined by the orbits of partonic 2surfaces along lines of generalize Feynman diagram defining the first homology group. Typically tree like structures would be involved with the ends of the tree at the upper boundary of CD effectively identified.
 This branching could serve as a representation for the branching of quantum state to a superposition of eigenstates of measured quantum observables. If this is the case, the various branches to which partonic 2surface decays at partonic 2surface would more or less relate to quantum superposition of final states in particle reaction. The number of branches would be finite by finite measurement resolution. For a given choice of the arrow of
geometric time the partonic surface would not fuse back at the upper end of CD.
 Rather paradoxically, the spacetime correlate for the dissipation would reduce the dissipation by increasing the effective value of hbar: the interpretation would be however in terms of dark matter identified in terms of large hbar phase. In the same manner dissipation would be accompanied by evolution since the increase of hbar naturally implies formation of macroscopically quantum coherent states. The spacetime representation of dissipation would compensate the increase of entropy at the ensemble level.
 The geometric representation of quantum superposition might take place only in the intersection of real and padic worlds and have interpretation in terms of cognitive representations. In the intersection one can also have a generalization of second law (see this) in which the generation of genuine negentropy in some spacetime regions via the build up of cognitive representation compensated by the generation of entropy at other spacetime regions. The entropy generating behavior of living matter conforms with this modification of the second law. The negentropy measure in question relies on the replacement of logarithms of probabilities with logarithms of their padic norms and works for rational probabilities and also their algebraic variants for finitedimensional algebraic extensions of rationals.
 Each state in the superposition of WCW quantum states would contain this representation as its spacetime correlate realizing selfreferentiality at quantum level in the intersection of real and padic worlds. Also the state function reduced members of ensemble could contain this cognitive representation at spacetime level. Essentially quantum memory making possible selfreferential linguistic representation of quantum state in terms of spacetime geometry and topology would be in question. The formulas written by mathematicians would define similar map from quantum level to the spacetime level making possible to "see" one's thoughts.
For more details see the new chapter Infinite Primes and Motives of "Physics as Generalized Number Theory" or the article with same title.
