The ultimate UFT should be obtained from un-designed theories, which are not Standard Model or General Relativity
Regarding Ultimate Reality, it is most likely hidden in Einstein's ultimate question, "The most incomprehensible thing about the world is that it is comprehensible".
1, My interpretation is that the great master wouldn't believe the world is intellectual designed, but he couldn't explain why it looks as orderly designed and who designed it. While he didn't give an answer, it's an insightful direction and I don't think it's unanswerable.
2, In fact, Weinberg answered it half way in a prescription for the theory of everything, "... [it] has to be simple ... equations that are based on a simple physical principle ... it has to give us the feeling that it could scarcely be different from what it is..." [1]. That is, it is based on one unified principle and is non-designed (no designer), but simply cannot be otherwise, e.g. EM.)
3, Therefore, the problem is not that Einstein's question cannot be answered, but that, for non-EM forces, there DOES NOT YET EXIST non-designed theories. (Unfortunately, neither standard model nor GR is non-designed.) If non-designed theories for these forces are found, Einstein's question would be answered.
4, In order to reach non-designed theories, it's important that certain concepts must NOT be assumed, because assumptions are subjective and lead to intellectual (human-, not God-) designed theories.
5, Actually, two unnoticed assumptions exist in today's physics, namely, 1. Pre-assumed plane angle scales (i.e. pre-assumed space flatness, axes perpendicularity and existence of symmetry) without physical definition, which leads to "designed" Standard Model. When we wonder why Standard Model looks like designed. The reason is simple: because it is in fact designed, not by God, but by ourselves. 2. Preselected inertial frames in special relativity leading to "designed" GR.
6, Let's consider the first assumption, "pre-assumed plane angle scales". Take 4d spacetime (and EM) as an example. Special Relativity used light speed to define the 4 linear scales. Not mentioned explicitly is the 6 circular magnetic and electric fields running among the 4 axes which define the "equivalencies" among the 4 axes. Without this definition, light would not be measured at equal speeds in different directions, rotational symmetry would not exist and photons cannot be generated.
7, Then, what are the fields running among the 6 "planes" to define the equivalencies among the 6 "angle scales". Just like linear scales, these equivalencies cannot be assumed, but "must" be defined by real physical fields running among the 6 planes. These fields are conjectured to be the "classical" weak fields. We may say these fields are running in solid (3d-) angles among planes (2d-surfaces). When equivalencies among angle scales are thus defined, an SO(6)~SU(4) (or SO(10)~SU(5) for 5d spacetime) symmetry surfaces, which is just the observed particle spectrum (without quarks). The relation between weak fields and plane angle scales are exactly that between EM and linear scales, making weak fields as un-designed as EM.
8, Likewise, there are two more levels of sub-geometries: fields running in 4d-angles among 3d-surfaces (conjectured to be CP-violation fields) and fields running in 5d-angles among 4d-surfaces (conjectured to be strong fields). Rotations in 5d-angles are believed to be causing baryon and various lepton numbers. The relations "between CP-violation fields and 3d-angle scales" and "between strong fields and 4d-angle scales" are also the same as that "between EM and linear scales", making CP-violation and strong fields as un-designed as EM. Details are in reference [2], "Theory of Fields of Unified Origin (TFUO)". More discussions are also in FQXi forum topic Anatomy of spacetime and possible origins of internal symmetry and all particle quantum numbers under category "High Energy Physics".
9, If the 6 (or 10) angle scales are not defined to be equivalent to each other by weak fields, a full circle on xy-plane may be 360 degrees, while that on yz-plane may be 362 degrees, then the 4d-spacetime would be warped and perpendicularity of axes cannot exist and symmetry would not surface. More accurately, without TFUO (or 3 levels of sub-geometries), linear spacetime on top would be warped and perpendicularity of axes cannot exist and symmetry would not surface.
10, In TFUO, strong, weak, CP-violation and EM fields are all originated from the same principle as Weinberg prescribed (each defining a critical scale). EM would be as complicated as other forces if not for the change of geometry by Special Relativity. What sub-geometries do to other forces is exactly the same thing as what Special Relativity does to EM. At the same time, complete particle zoo is generated from all layers of geometries. This is a big achievement through removal of assumption of automatic equivalencies of plane angle scales (i.e. automatic space flatness, or axes perpendicularity, or symmetry presence). We see assumption often deprives us of otherwise present possibility to uncover real nature of physics.
11, It is important to emphasize that, whether 4d, 5d, 11d, or 26d, there cannot be automatic flatness of space, automatic perpendicularity of axes and automatic symmetry, unless sub-geometries exist to support them. (It may be possible in mathematics but not in physics, because two persons could define differently, but physics will only follow what is defined by Nature). Take 11d as an example, if the (11x10/2=) 55 plane angle scales are not defined equivalent to each other by physical fields running among them, then the space would be warped and perpendicularity of the 11 axes is lost and the 11d symmetry would not exist. Simply put, the wished-for 11d symmetry wouldn't exist if sub-geometries don't exist. But if sub-geometries exist, 11d micro dimensions are no longer needed, because the sub-geometries already offer all the symmetries needed for particle spectrum. In fact, the 11 micro dimensions are never observed. (Also, the sub-geometry of 55 planes should generate SO(55) spectrum, which is not observed either.)
12, Let's consider the second assumption, "preselected inertial frames". It's well known inertial (uniform) frames are "preselected" before spacetime scales are defined to verify uniformity in SR. Removal of this assumption leads unambiguously to the "objective" 5d spacetime [3].
13, What is done here (and in sub-geometries/TFUO) is to restore the original Nature hidden behind assumptions. Without this restoration, it's highly doubtful quantum gravity and ultimate UFT can be successful.
14, To be published is the ultimate 5d non-designed gravitation (NDG), which is "linear" and quantize-able. It meets all 3 tests of GR. Note that, the 3 tests (bending of light, perihelion motion of Mercury and gravitational red shift) did not test GR completely, as they are based on Schwarzschild solution with Einstein/stress-energy tensor set to 0. This means the exact "non-0 expression" of Einstein/stress-energy tensor has not been tested, since a different expression (e.g. this 5d linear gravitation) could work just as well, as long as it can be set to 0 in these situations. The 5d gravitation joins TFUO to form the ultimate theory, which answers Einstein's question.
15, This should "not" be just another fancy idea, but is THE long-sought-for ultimate theory, as: 1. It meets Weinberg's prescription above, as all forces originate from the same principle (i.e. each defining a critical scale). 2. It is able to answer Einstein's ultimate question, as intellectual designer is eliminated in this non-designed theory of forces and particles, just as EM and photons. 3. While more verifications are needed, the symmetry, SU(4) or SU(5), already meets particle spectrum without quarks. 4. Linear gravity can be quantized. 5. The strongest evidence is that no micro dimensions are observed for any symmetry for standard model or string theory or whatsoever. On the other hand, sub-geometries are the most (or the only) plausible explanation for particle spectrum and forces.
With TFUO, we may be in a position to answer Einstein's question and the Ultimate Reality. The triplet: spacetime (with sub-geometries), forces and particles, come together. There is no hard cored particles, they feel like hard cored only because they have half spin, otherwise they would overlap on each other just like photons. (There is no real material objects, all stem from spacetime conceptually.) There is no other creator in the universe. As long as we are in a 4d- or 5d-spacetime, the same particles and forces would surface automatically. The world is like standardized vehicles (particles) powered by standardized engines (forces) running on standardized highways (spacetime and sub-geometries).
Therefore, when I came across FQXi and found it was eager to uncover the ultimate theory, I contacted them, saying the ultimate theory already exists, all needed is just "dissemination" and verification. Thanks to Professor Schindler for setting up a forum topic under High Energy Physics on Sep 9, 2021. Since this is also the key step toward the Ultimate Reality, I take this chance to post this from the perspective of Ultimate Reality.
Since the paper attached seems not working, anyone can send an email to: qchiang2@yahoo.com , I will send a free copy from there.
References
[1] Steven Weinberg, "Will a theory of everything reign?", TIME April 10, 2000, p. 86.
[2] Kwan C. Chiang, "Anatomy of spacetime and possible origins of internal symmetry and all particle quantum numbers", Physics Essays, Vol. 33, N.3 p342-347, 2020.
[3] K. C. Chiang: "A Unified Gravitation and Quantum Mechanical Space-Time Structure through a Unified Origin of Inertial and Gravitational Masses and a discussion of the Foundation of Special Relativity", Il Nuovo Cimento Vol. 68B, N.2 p322, 1982.