Particle detectors in superposition in de Sitter spacetime
- URL: http://arxiv.org/abs/2403.02087v1
- Date: Mon, 4 Mar 2024 14:45:33 GMT
- Title: Particle detectors in superposition in de Sitter spacetime
- Authors: Laura Niermann and Luis C. Barbado
- Abstract summary: Cosmological particle creation is the phenomenon by which the expansion of spacetime results in the production of particles of a given quantum field in that spacetime.
We study this phenomenon by considering a multi-level quantum particle detector in de Sitter spacetime coupled to a massless real quantum scalar field.
The main novel result is that, due to the quantum nature of the superposition of trajectories, the state of the detector after interaction with the field is not only a mixture of the thermal states that would be expected from each individual static trajectory but rather exhibits additional coherences due to interferences between the different trajectories.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Cosmological particle creation is the phenomenon by which the expansion of
spacetime results in the production of particles of a given quantum field in
that spacetime. In this paper, we study this phenomenon by considering a
multi-level quantum particle detector in de Sitter spacetime coupled to a
massless real quantum scalar field. Rather than considering a fixed classical
trajectory for the detector, following recent novel approaches we consider a
quantum superposition of trajectories, in particular of static trajectories
which keep a fixed distance from one another. The main novel result is that,
due to the quantum nature of the superposition of trajectories, the state of
the detector after interaction with the field is not only a mixture of the
thermal states that would be expected from each individual static trajectory
but rather exhibits additional coherences due to interferences between the
different trajectories. We study these in detail and associate them with the
properties of the particle absorbed by the detector from the thermal bath.
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