2023•Journal of Physics Conference SeriesOpen access

Instantaneous vacuum and States of Low Energy for a scalar field in cosmological backgrounds

Antonio Ferreiro, Silvia Pla

Abstract

Abstract We construct the instantaneous vacuum state for a quantum scalar field coupled to another classical scalar field as described in [1]. We then compare it with the state of low energy constructed for a particular solution. We show that under physically motivated conditions they become very similar.

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Key concepts: Scalar field, Physics, Vacuum state, Vacuum energy, Scalar (mathematics), Field (mathematics), Scalar field theory, Quantum field theory