Hot scalar radiation around a cosmic string setting bounds on the coupling parameter ξ

Moreira, E. S.

doi:10.1007/jhep03(2017)105

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…[3] for a current application). Just to mention few other examples, local thermal behavior of a massive scalar field near a reflecting wall leads to the existence of bounds on the coupling curvature parameter [4,5], and in the context of semiclassical gravity we report a sort of quantum dragging effect [6] in a spacetime of a cosmic string presenting a dislocation along its axial axis.…”

Section: Introductionmentioning

confidence: 76%

Vacuum fluctuations of a scalar field near a reflecting boundary and their effects on the motion of a test particle

Camargo

Lorenci

Ribeiro

et al. 2018

J. High Energ. Phys.

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The contribution from quantum vacuum fluctuations of a real massless scalar field to the motion of a test particle that interacts with the field in the presence of a perfectly reflecting flat boundary is here investigated. There is no quantum induced dispersions on the motion of the particle when it is alone in the empty space. However, when a reflecting wall is introduced, dispersions occur with magnitude dependent on how fast the system evolves between the two scenarios. A possible way of implementing this process would be by means of an idealized sudden switching, for which the transition occurs instantaneously. Although the sudden process is a simple and mathematically convenient idealization it brings some divergences to the results, particularly at a time corresponding to a round trip of a light signal between the particle and the wall. It is shown that the use of smooth switching functions, besides regularizing such divergences, enables us to better understand the behavior of the quantum dispersions induced on the motion of the particle. Furthermore, the action of modifying the vacuum state of the system leads to a change in the particle energy that depends on how fast the transition between these states is implemented. Possible implications of these results to the similar case of an electric charge near a perfectly conducting wall are discussed.

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Section: Introductionmentioning

confidence: 76%

Vacuum fluctuations of a scalar field near a reflecting boundary and their effects on the motion of a test particle

Camargo

Lorenci

Ribeiro

et al. 2018

J. High Energ. Phys.

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show abstract

“…We may also quote the more severe effect of spontaneous scalarization, where the vacuum fluctuations lead to phase transitions in certain spacetimes [2]. In the context of a quantum scalar field near a reflecting wall in locally flat spacetime, requirement of thermodynamic equilibrium leads to a restriction on the possible values of the curvature coupling parameter ξ [3,4]. Particularly, it is shown that for higher dimensions the minimal coupling is ruled out.…”

Section: Introductionmentioning

confidence: 99%

Probing thermal fluctuations through scalar test particles

et al. 2021

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The fundamental vacuum state of quantum fields, related to Minkowski space, produces divergent fluctuations that must be suppressed in order to bring reality to the description of physical systems. As a consequence, negative vacuum expectation values of classically positive-defined quantities can appear. This has been addressed in the literature as subvacuum phenomenon. Here it is investigated how a scalar charged test particle is affected by the vacuum fluctuations of a massive scalar field in D + 1 spacetime when the background evolves from empty space to a thermal bath, and also when a perfectly reflecting boundary is included. It is shown that when the particle is brought into a thermal bath it gains an amount of energy by means of positive dispersions of its velocity components. The magnitude of this effect is dependent on the temperature and also on the field mass. However, when a reflecting wall is inserted, dispersions can be positive or negative, showing that subvacuum effect happens even in a finite temperature environment. Furthermore, a remarkable result is that temperature can even improve negative velocity fluctuations. The magnitude of the residual effects depends on the switching interval of time the system takes to evolve between two states.

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Ambiguities in the local thermal behavior of the scalar radiation in one-dimensional boxes

Moreira

2020

Phys. Rev. D

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Hot scalar radiation around a cosmic string setting bounds on the coupling parameter ξ

Cited by 4 publications

References 25 publications

Vacuum fluctuations of a scalar field near a reflecting boundary and their effects on the motion of a test particle

Vacuum fluctuations of a scalar field near a reflecting boundary and their effects on the motion of a test particle

Probing thermal fluctuations through scalar test particles

Ambiguities in the local thermal behavior of the scalar radiation in one-dimensional boxes

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