TL;DR
This paper explores how five-dimensional relativity can explain the behavior of particles in four dimensions, suggesting that null paths in 5D correspond to massive particles in 4D with oscillations in the extra dimension.
Contribution
It proposes a model where 5D null paths manifest as 4D massive particles with oscillations, linking 5D geometry to 4D physics and symmetry principles.
Findings
Null paths in 5D appear as timelike paths in 4D.
Particles in 5D can be multiply imaged in 4D.
4D weak equivalence principle may be a 5D symmetry.
Abstract
It is possible that null paths in 5D appear as the timelike paths of massive particles in 4D, where there is an oscillation in the fifth dimension around the hypersurface we call spacetime. A particle in 5D may be regarded as multiply imaged in 4D, and the 4D weak equivalence principle may be regarded as a symmetry of the 5D metric.
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