Extragalactic TEV photons and the zero-point vibration spectrum limit

There are observations indicating a possible anomalous transparency of intergalactic space (filled with infrared background light) for extragalactic gamma-rays of very high energy (> 100 GeV). The anomaly is usually associated with effects of some new physics. However, another explanation is possible - as a manifestation relating to a cut-off of the zero-point vibration spectrum. It is assumed that this boundary 𝑈ZV is isotropic in the reference frame, where the cosmic microwave background (CMB) radiation is isotropic, and an estimate is obtained: 𝑈ZV ≈ 7.4TeV. It is noted that the presence of a boundary also leads to an increased beta decay time of accelerated particles with the Lorentz factor > 50 (in the CMB rest frame; in addition to the usual (𝛽)). It is widely believed that the ZV-spectrum continues up to the Planck energy (in natural units, the gravitational constant is related to the square of the Planck length). There is, however, a 5D variant of the Absolute Parallelism theory (AP), free from singularities of solutions, where a large characteristic length appears, which determines the thickness of expanding spherical 𝑆3 shell (a cosmological solution as the longitudinal wave along the radius) in co-moving co-ordinates. Newton’s Law ~ 1/𝑟2 is replaced by 1/𝑟 at distances exceeding 𝐿, and the Planck length (a composite parameter) “arises” from when switching to the conventional energy-momentum scale (where the energy of a photon is its angular frequency). The theory features are briefly exposed - description of 15 polarizations (degrees of freedom), the energymomentum tensor (in prolonged 4th order equations), topological charges and quasi-charges of localized field configurations.