Thursday, November 30, 2023

Wide Binaries Are Basically Newtonian in Moffat's MOG Theory

Like Deur's approach, Moffat's modified gravity theory does not predict non-Newtonian behavior that is discernible in wide binary stars.
Wide binary stars are used to test the modified gravity called Scalar-Tensor-Vector Gravity or MOG. This theory is based on the additional gravitational degrees of freedom, the scalar field G=GN(1+α), where GN is Newton's constant, and the massive (spin-1 graviton) vector field ϕμ. The wide binaries have separations of 2-30 kAU. The MOG acceleration law, derived from the MOG field equations and equations of motion of a massive test particle for weak gravitational fields, depends on the enhanced gravitational constant G=GN(1+α) and the effective running mass μ. The magnitude of α depends on the physical length scale or averaging scale ℓ of the system. The modified MOG acceleration law for weak gravitational fields predicts that for the solar system and for the wide binary star systems gravitational dynamics follows Newton's law.
John W. Moffat, "Wide Binaries and Modified Gravity (MOG)" arXiv:2311.17130 (November 28, 2023).


neo said...

I'm waiting for PADME run 3 and MEG II

from Russia not Hungry

arXiv:2311.18632 (hep-ex)
[Submitted on 30 Nov 2023]
Observation of structures at ∼17 and ∼38 MeV/c2 in the γγ invariant mass spectra in pC, dC, and dCu collisions at plab of a few GeV/c per nucleon
Kh.U. Abraamyan, Ch. Austin, M.I. Baznat, K.K. Gudima, M.A. Kozhin, S.G. Reznikov, A.S. Sorin
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The results of an analysis of the invariant mass spectra of photon pairs produced in dC, pC and dCu interactions at momenta of 2.75, 5.5 and 3.83 GeV/c per nucleon respectively, are presented. Signals in the form of enhanced structures at invariant masses of about 17 and 38 MeV/c2 are observed. The results of testing of the observed signals, including the results of the Monte Carlo simulation are presented. The test results support the conclusion that the observed signals are the consequence of detection of the particles with masses of about 17 and 38 MeV/c2 decaying into a pair of photons.

Comments: arXiv admin note: text overlap with arXiv:0806.2790
Subjects: High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:2311.18632 [hep-ex]
(or arXiv:2311.18632v1 [hep-ex] for this version)

andrew said...

Color me skeptical.

neo said...

did you read it ?

from the paper

A series of experiments on the production of photon pairs in the interactions of protons,
deuterons and alpha particles with nuclei was carried out on the internal beams of the
Nuclotron at JINR. The experiments were performed on a multichannel two-arm gamma
spectrometer of the SPHERE setup (the PHOTON-2 setup). The results of the first analysis
on the production of η mesons (selection of photons from different arms of the spectrometer)

For this
anomalous region, it is important to confirm the observation of the X17 particle using very
different techniques and apparatus. It is furthermore important to know whether the X17,

A. General layout
The data acquisition of production of neutral mesons and γ-quanta in interactions of protons
and light nuclei with nuclei has been carried out with internal beams of the JINR Nuclotron
[1]. The experiments were conducted with internal proton beams at momentum 5.5 GeV/c
incident on a carbon target and with 2H, 4He beams and internal C-, Al-, Cu-, W-, Au-
targets at momenta from 1.7 to 3.8 GeV/c per nucleon. For the first analysis the data
for the d(2.0A GeV) + C, d(3.0A GeV) + Cu and p(4.6 GeV) + C reactions were selected.
Some results on γγ pair production in these reactions, for the effective mass region, Mγγ >
100 MeV/c2 (photons in pair from different arms of the spectrometer) were reported in [1].
Typical proton and deuteron fluxes were about 108 and 109 per pulse respectively. The
electromagnetic lead glass calorimeter PHOTON-2 was used to measure both the energies
and emission angles of photons. The experimental instrumentation is schematically repre-

The number of γγ pairs in the range of 12-22 MeV/c2 after the background subtraction
in the sum of three experiments is 924 ± 77. The values of the obtained fitting parameters
in (5) are in the pictures. The parameter N0 for the sum of the data obtained in the p + C,
d + C and d + Cu experiments, is:
N0 = 856 ± 75.
Thus, the statistics in the observed structure about 17 MeV/c2 is more than 11 standard
deviations. Based on the changes of the signal position (xc parameter) in the different
experiments (from 16.4 to 17.7 MeV/c2), we estimate the possible systematic errors to be
no more than ±0.7 MeV/c2.

Along with π0 mesons, signals in the form of enhanced structures at invariant masses of
about 17 and 38 MeV/c2 are observed in the reactions p + C → γ + γ + x, d + C → γ + γ + x
and d + Cu → γ + γ + x at momenta 5.5 GeV/c, 2.75 GeV/c and 3.83 GeV/c per nucleon,
respectively. The results of testing of the observed signals, including the results of the Monte
Carlo simulation support the conclusion that the observed signals are the consequence of

Mitchell said...

Stacy McGaugh's meta-analysis suggests to me that there *is* a MOND signal in the wide binaries.

andrew said...


I certainly don't know who's right. I have a very high level of certainty that dark matter phenomena are really part of a gravitational force law and are not due to dark matter particles.

But, I have only a quite modest level of confidence about which particular gravitational solution is the correct one.