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arXiv · 2502.06945

Acceleration-induced radiation from a qudit particle detector model

Kensuke Gallock-Yoshimura·Yuki Osawa·Yasusada Nambu
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Abstract

We nonperturbatively examine the emission rate of acceleration-induced radiation from a uniformly accelerated gapless qudit-type Unruh-DeWitt detector. We find that the emission rate can be written as Larmor's formula multiplied by a factor that depends on the detector's initial state. In particular, certain initial states of integer-spin detectors do not produce radiation. Although the appearance of Larmor's formula may suggest a classical phenomenon, we argue that the resulting radiation is fundamentally distinct from that of structureless classical sources, as it evolves into a multimode coherent state correlated with the detector's internal degree of freedom. Thus, gapless detectors cannot be treated as structureless sources, as previously proposed.

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Kensuke Gallock-Yoshimura, Yuki Osawa, Yasusada Nambu. 2025-02-10. Acceleration-induced radiation from a qudit particle detector model. https://doi.org/10.1103/physrevd.111.105012

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