I say that my 3 most important ideas are: (1) Milgrom is the Kepler of contemporary cosmology. (2) The Koide formula is essential for understanding the foundations of physics. (3) Lestone's theory of virtual cross sections is essential for understanding the foundations of physics.
The axion is coupled to the electromagnetic field in ways that should be testable.
Sikivie, P., 1983. Experimental tests of the" invisible" axion. Physical Review Letters, 51(16), p.1415.
Could most of the proton charge radius puzzle be explained by unexpected electromagnetic interactions caused by axions?
John P. Lestone has suggested that leptons might be quantum micro black holes according to his theory of virtual cross sections.
Possible Mechanism for the Generation of a Fundamental Unit of Charge (long version), Los Alamos Report LA-UR-17-24901, 16 June 2017
If Lestone is correct, then massive bosons might be (approximately) quantum micro black hole 1-spheres, leptons might be quantum micro black hole 2-spheres, and quarks might be quantum micro black hole 3-spheres.
The electromagnetic effects of axions (1-spheres with virtual cross sections) and leptons (2-spheres with virtual cross sections) might suggest that some form of electromagnetic uncertainty might be approximated by (axion mass)/(electron mass).
Can the proton charge radius puzzle be resolved in terms of electromagnetic effects from axions?
Proton radius puzzle, Wikipedia
Axion, Wikipedia
According to Graf and Steffen, "If the Peccei-Quinn (PQ) mechanism is the explanation of the strong CP problem, axions will pervade the Universe as an extremely weakly interacting light particle species."
"Thermal axion production in the primordial quark-gluon plasma" by Peter Graf and Frank Daniel Steffen, 2011
According to Derbin et al., "If the axions or other axion-like pseudo scalar particles couple with electrons then they are emitted from Sun by the Compton process and by bremstrahlung ...:
"Search for solar axions produced by Compton process and bremsstrahlung using the resonant absorption and axioelectric effect" by A. V. Derbin, et al., 2013
What is the magnitude of the uncertainty in determining the fine structure constant?
Fine structure constant, Wikipedia
Hanneke, Fogwell, and Gabrielse (2008) estimated 1/(fine structure constant) as: 137.035999084(51)
Hanneke, D., Fogwell, S., & Gabrielse, G. (2008). New measurement of the electron magnetic moment and the fine structure constant. Physical Review Letters, 100(12), 120801.
.000000051/137.035999084 = 3.72... * 10^-10
(electron mass) * 3.72 * 10^-10 = 1.901 * 10^-4 eV/c^2
P. J. Mohr, B. N. Taylor, and D. B. Newell (2015) estimated 1/(fine structure constant) as: 137.035999139(31)
"Fine structure constant" in CODATA Internationally recommended 2014 values of the fundamental physical constants, National Institute of Standards and Technology
.000000031/137.035999139 = 2.262... * 10^-10
(electron mass) * 2.262 * 10^-10 = 1.156 * 10^-4 eV/c^2
How might the proton radius puzzle be related to uncertainties in determining the fine structure constant?
In the article "The Rydberg constant and proton size from atomic hydrogen" Beyer et al. (2017) stated (p. 80), "Line shape distortions caused by quantum interference from distant neighboring atomic resonances have recently come into the focus of the precision spectroscopy community ... To the best of our knowledge, this effect has been considered in the analysis of only one of the previous H experiments and was found to be unimportant for that particular experimental scheme ... The effect was found to be responsible for discrepancies in the value of the fine structure constant α extracted from various precision spectroscopy experiments in helium ... The root of the matter is that natural line shapes of atomic resonances may experience deviations from a perfect Lorentzian when off-resonant transitions are present."
Beyer, Axel, Lothar Maisenbacher, Arthur Matveev, Randolf Pohl, Ksenia Khabarova, Alexey Grinin, Tobias Lamour et al. "The Rydberg constant and proton size from atomic hydrogen." Science 358, no. 6359 (2017): 79-85.
Are axions a likely source of off-resonant transitions? Could the older experiments for determining the proton charge radius have failed to eliminate axion interactions as a source of inflating the value of the proton radius? Could the 2017 experiment by Beyer et al. be failing to take into account axion interactions? What might happen if experiments for measuring the proton charge radius were performed at 4 different levels of shielding -- on the surface, in a slightly deep mine, in a moderately deep mine, and in a very deep mine -- to check for possible axion production of off-resonant transitions? By assuming a precise value for the axion mass could the 2017 experiment by Beyer et al. be modified for axion detection?
If most of the proton charge radius puzzle can be explained by uncertainty in estimating the finite structure constant due to unexpected axion detection, then (1.2 ± 1.0) * 10^4 eV/c^2 might be a plausible estimate for the axion mass.