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| Main Authors: | , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2502.20328 |
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| _version_ | 1866916970552623104 |
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| author | Passegger, Albert Georg Verch, Rainer |
| author_facet | Passegger, Albert Georg Verch, Rainer |
| contents | We calculate the transition rate of an Unruh-DeWitt detector coupled to a non-equilibrium steady state (NESS) of a free massless scalar field on four-dimensional Minkowski spacetime. Bringing two semi-infinite heat baths at different temperatures into thermal contact along a surface, the NESS arises at asymptotically late times as a stationary state that has modewise thermal properties and features a heat flow between the reservoirs. The detector couples linearly to the field by a monopole interaction, and it moves inertially along the axis of the NESS heat flow. We contrast the transition rate with the case of a detector that is coupled to an inertial thermal equilibrium state. The results illustrate that the monopole does not couple to the heat flow, causing the detector to only register kinematical effects. Hence dynamical features of the NESS are hidden from this detector model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_20328 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing non-equilibrium steady states of the Klein-Gordon field with Unruh-DeWitt detectors Passegger, Albert Georg Verch, Rainer High Energy Physics - Theory Statistical Mechanics Mathematical Physics Quantum Physics 82C10, 82B10, 81T28 We calculate the transition rate of an Unruh-DeWitt detector coupled to a non-equilibrium steady state (NESS) of a free massless scalar field on four-dimensional Minkowski spacetime. Bringing two semi-infinite heat baths at different temperatures into thermal contact along a surface, the NESS arises at asymptotically late times as a stationary state that has modewise thermal properties and features a heat flow between the reservoirs. The detector couples linearly to the field by a monopole interaction, and it moves inertially along the axis of the NESS heat flow. We contrast the transition rate with the case of a detector that is coupled to an inertial thermal equilibrium state. The results illustrate that the monopole does not couple to the heat flow, causing the detector to only register kinematical effects. Hence dynamical features of the NESS are hidden from this detector model. |
| title | Probing non-equilibrium steady states of the Klein-Gordon field with Unruh-DeWitt detectors |
| topic | High Energy Physics - Theory Statistical Mechanics Mathematical Physics Quantum Physics 82C10, 82B10, 81T28 |
| url | https://arxiv.org/abs/2502.20328 |