2023•arXiv (Cornell University)Open access

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

Antonio Ferreiro, Silvia Pla

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, Scalar (mathematics), Vacuum energy, Field (mathematics), Theoretical physics, Quantum field theory