**European Journal of Physics (IOP) papers**

**Göttingen Presentation ***Deutsche Physikalische Gesellschaft*

**Vixra.org posting**

**Results in Physics (Elsevier)**

- Bell’s twin rockets non-inertial length enigma resolved by real geometry (2017)
- Real-metric spacetime own-surfaces hosting nongeodesic radar paths crossing ‘hemix’ own-lines and shared velocity helices (2019)
- ADDENDUM PDF
Addendum/Corrigendum submitted to *Results in Physics* February 2020:

The *Real-metric spacetime own-surfaces *paper’s *Introduction *section* *referred to *the static gravitational field *discussed by Einstein in his 1912 paper (reference [5]). Such a constant ‘background’ one-dimensional gravity field could be created by an infinite radius thin disk. Independently of its distance from the disk, as easily shown, any small object would be subject to a fixed acceleration *a *= 2π*G*ω*h *along the disk’s axis, *G *being the universal gravitational constant, ω the disk’s mass density per unit volume and *h *being the disk’s thickness—necessarily negligible compared with any object’s distance. Acceleration *a *however is that with respect to the inertial reference frame of the disk itself. This differs from any medium’s constituent’s own-[proper]acceleration α in a comoving frame which, as well known, relates as *a *= α/γ^{3}. For α to remain constant the infinite radius disk thickness h would have to be caused to dynamically decrease by 1/γ^{3}, in a manner accommodating gravitational time lags proportional to differing radial distances. Accordingly, the paper’s *‘*homogeneously accelerating’ medium case is not fully equivalent to Einstein’s *static* field scenario.

Hence in the *Introduction *section’s 3rd paragraph, *‘replicates’* should read *‘approximately replicates’*; four lines after equation (26) *‘idealised’* should read *‘approximately idealised’*; and ‘*exactly*’ in the paper’s 5th last paragraph should be replaced by ‘*approximated by*’.

Nevertheless this does not reflect on the paper’s thesis, in particular its paradigm as *the ‘simplest possible case’* visually embodying key properties of an accelerating extended medium’s real-metric manifold, and directly challenging general relativity literature’s endemically hypothesised geodesics.

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