On Three Equivalent Definitions for the Spin 1 Massive Particles in Robertson-Walker Universe

Physics

Scientific paper

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Scientific paper

We compare three massive spin 1 particle models, in curved space-time for a slowly expanding universe of Robertson-Walker type. The comparison is made by means of the kernel which generalizes to curved space-time the flat-space kernel Delta1ij (x, y). Three alternative hypotheses are given to define that kernel. We finally conclude that these hypotheses define a particle model equivalent to the adiabatic one.

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