A vector field is considered in a Friedmann metric. At the level of classical field theory, one can show that the field comprises a spin-one part and a spin-zero part, whose mass has to be zero, and which is not the usual spin-zero part of vector fields in flat space-time. At the quantum level, because of the Friedmann expansion, the particle number varies. This is fully analogous to a well-known phenomenon already thoroughly studied for scalar and spinor fields. However, because of the presence of the new spin-zero part, in the initial stages of the universal expansion the number of particles must decrease, necessarily implying the existence of a large number of vector quanta since the Planck time. Later on, the expansion will cause particle creation in the same way as in the scalar and spinor theories.

Vector Particle Creation and Annihilation in a Friedmann Expansion

MATARRESE, SABINO;
1981

Abstract

A vector field is considered in a Friedmann metric. At the level of classical field theory, one can show that the field comprises a spin-one part and a spin-zero part, whose mass has to be zero, and which is not the usual spin-zero part of vector fields in flat space-time. At the quantum level, because of the Friedmann expansion, the particle number varies. This is fully analogous to a well-known phenomenon already thoroughly studied for scalar and spinor fields. However, because of the presence of the new spin-zero part, in the initial stages of the universal expansion the number of particles must decrease, necessarily implying the existence of a large number of vector quanta since the Planck time. Later on, the expansion will cause particle creation in the same way as in the scalar and spinor theories.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/135960
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