Abstract
The 5-dimensional extension of cosmological special and general relativity is considered. In this framework it is possible to define a 5-dimensional perfect fluid stress-energy tensor and to unify the equations of perfect hydrodynamics in a single 5-dimensional tensor conservation law. This picture in principle permits to interpret particle production phenomena as cosmological effects, in the spirit of open system cosmology.
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Gemelli, G. Particle Production in 5-Dimensional Cosmological Relativity. Int J Theor Phys 45, 2226–2234 (2006). https://doi.org/10.1007/s10773-006-9187-z
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DOI: https://doi.org/10.1007/s10773-006-9187-z