Corrections induced by the GUP to the Lamb shift of an accelerated atom interacting with a quantum scalar field
Abstract
We investigate the effect of the GUP on the Lamb shift of a two-level atom interacting with a real massless scalar quantum field, within the DDC formalism. For an atom undergoing inertial motion, uniform acceleration, and uniform circular motion, we analyze the separate contributions of vacuum fluctuations and radiation reaction. We first derive the statistical functions of the field along the atom's trajectories for the three types of motion, expressing them as frequency integrals, and then employ them to calculate the vacuum fluctuation and radiation reaction contributions to the radiative level shift. We show that the GUP-modified Lamb shift of the two-level atom arises entirely from vacuum fluctuations and acquires additional corrections proportional to β. We focus in particular on the acceleration-dependent GUP corrections. For a uniformly accelerated atom, the GUP corrections comprise thermal and nonthermal parts. At low accelerations, the thermal part exhibits nonmonotonic behavior, and is proportional to a4 in the limit a/ω0 → 0; the nonthermal part, by contrast, grows nonlinearly and monotonically, exceeding the thermal part by nearly two orders of magnitude at large accelerations. For an atom in uniform circular motion, the GUP corrections are purely nonthermal and also display a nonlinear, monotonic dependence on acceleration, increasing or decreasing steeply according to the sign of β. For the same β, the corrections are larger in uniform circular motion than in uniformly accelerated motion, since the former involves terms proportional to both a2 and a3, whereas the latter contains only a2 terms.
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BibTeX
@misc{wang2026corrections,
title = {{Corrections induced by the GUP to the Lamb shift of an accelerated atom interacting with a quantum scalar field}},
author = {Zhi Wang and Yi Yang and Zhengwen Long},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.26914},
eprint = {2608.26914},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.26914},
}
RIS
TY - UNPB
TI - Corrections induced by the GUP to the Lamb shift of an accelerated atom interacting with a quantum scalar field
AU - Zhi Wang
AU - Yi Yang
AU - Zhengwen Long
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2608.26914
UR - https://arxiv.org/abs/2608.26914
AB - We investigate the effect of the GUP on the Lamb shift of a two-level atom interacting with a real massless scalar quantum field, within the DDC formalism. For an atom undergoing inertial motion, uniform acceleration, and uniform circular motion, we analyze the separate contributions of vacuum fluctuations and radiation reaction. We first derive the statistical functions of the field along the atom's trajectories for the three types of motion, expressing them as frequency integrals, and then employ them to calculate the vacuum fluctuation and radiation reaction contributions to the radiative level shift. We show that the GUP-modified Lamb shift of the two-level atom arises entirely from vacuum fluctuations and acquires additional corrections proportional to β. We focus in particular on the acceleration-dependent GUP corrections. For a uniformly accelerated atom, the GUP corrections comprise thermal and nonthermal parts. At low accelerations, the thermal part exhibits nonmonotonic behavior, and is proportional to a^4 in the limit a/ω_0 → 0; the nonthermal part, by contrast, grows nonlinearly and monotonically, exceeding the thermal part by nearly two orders of magnitude at large accelerations. For an atom in uniform circular motion, the GUP corrections are purely nonthermal and also display a nonlinear, monotonic dependence on acceleration, increasing or decreasing steeply according to the sign of β. For the same β, the corrections are larger in uniform circular motion than in uniformly accelerated motion, since the former involves terms proportional to both a^2 and a^3, whereas the latter contains only a^2 terms.
ER -