My guess is that string theory with the infinite nature hypothesis implies the Friedmann model and dark-matter-compensation-constant = 0, but string theory with the finite nature hypothesis implies the Riofrio-Sanejouand model and dark-matter-compensation-constant = (3.9±.5) * 10^-5 . Have string theorists overlooked several possibilities for restricting the string landscape? J. P. Lestone of Los Alamos National Laboratory has developed a theory of virtual cross sections.
"Vacuum Polarization: A Different Perspective" by J. P. Lestone, report LA-UR-20-23090, April 2020
"QED: A different perspective" by J. P. Lestone, report LA-UR-18-29048, September 2018
"Possible reason for the numerical value of the fine-structure constant" by J. P. Lestone, report LA-UR-18-21550, February 2018
"Possible Mechanism for the Generation of a Fundamental Unit of Charge (long version)" by J. P. Lestone, report LA-UR-17-24901, June 2017
Lestone's theory is semi-classical and is not completely valid in terms of relativity theory. Many string theorists are unaware of Lestone's theory (which is loosely based upon string theory). Can Lestone's theory be made fully relativistic and, at least partially, compatible with siring theory?
Consider the following speculation:
Tachyonic Network Hypothesis (with subsidiary hypotheses A,B,C,D):
(A) String theory with the infinite nature hypothesis implies the Big Bang, the inflaton field, and, after quantum averaging, Einstein's field equations are totally correct. For times shorter than one Planck-time unit, the concepts of measurement, energy, and spacetime fail. For times in the range from one Planck-time unit to one hundred thousand Planck-time units, the Heisenberg uncertainty principle needs to be replaced by a generalized uncertainty principle (GUP). Call this the GUP range. For times greater than one hundred thousand Planck time units, the Heisenberg uncertainty principle is valid for almost all purposes.
(B) In the GUP range, 3-dimensional space needs to be replaced by 9-dimensional virtual space, which consists of 3 copies of the unit sphere in quaternionic space. In the GUP range, 1-dimensional time needs to be replaced by 2-dimensional time, which consists of 1 dimension of measurable time and 1 dimension of non-measurable, imaginary time. Non-measurable, imaginary time is bounded. As non-measurable, imaginary time shrinks to zero, 9-dimensional virtual space shrinks to 3-dimensional measurable space. Massless bosons have 0-dimensional virtual cross sections. Massive bosons have 1-dimensional virtual cross sections. Leptons have 2-dimensional virtual cross sections. Quarks have 8-dimensional virtual cross sections.
(C) To 36 quarks, 12 leptons, 9 massless bosons, and 4 massive bosons, adjoin the graviton, the axion, and the inflaton to get 64 fundamental particles. There is a 256-dimensional lattice approximation for string theory in which there are 64 virtual particle paths with each particle path having 4 dimensions of uncertainty. The 256-dimensional lattice approximation with 8 dimensions of virtual-cross-sectional uncertainty generates 264 dimensions of stringy uncertainty, which can be decomposed into 11 copies of the Leech lattice.
(D) Each virtual particle has 11 copies of the Leech lattice associated with it. As virtual particles collapse into measurable particles, there is an enormous network of non-measurable virtual tachyons, which link the measurable particles together. The virtual tachyons do not last long enough to be directly measured, but they do allow a transient violation of energy conservation which is postulated in Lestone's theory of virtual cross sections. The massless virtual particles collapse into 10 possible massless bosons. The massive virtual particles (which have imaginary mass-energy) collapse into 54 possible bosons. There might be other measurable particles for which this lattice approximation scheme fails (e.g. SUSY, magnetic monopoles, Majorana fermions), but the lattice approximation based upon 11 copies of the Leech lattice does work well enough to justify Lestone's theory of virtual cross sections.