Gravitational causality and the self-stress of photons
Gravitational causality and the self-stress of photons
复制标题
引力因果关系和光子的自应力
DOI:
10.1007/jhep05(2022)154
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发表时间:
2022
影响因子:
5.4
通讯作者:
Sgarlata, Francesco
中科院分区:
文献类型:
--
作者:
Bellazzini, Brando;Isabella, Giulia;Lewandowski, Matthew;Sgarlata, Francesco
We study causality in gravitational systems beyond the classical limit. Using on-shell methods, we consider the 1-loop corrections from charged particles to the photon energy-momentum tensor—the self-stress—that controls the quantum interaction between two on-shell photons and one off-shell graviton. The self-stress determines in turn the phase shift and time delay in the scattering of photons against a spectator particle of any spin in the eikonal regime. We show that the sign of the β-function associated to the running gauge coupling is related to the sign of time delay at small impact parameter. Our results show that, at first post-Minkowskian order, asymptotic causality, where the time delay experienced by any particle must be positive, is respected quantum mechanically. Contrasted with asymptotic causality, we explore a local notion of causality, where the time delay is longer than the one of gravitons, which is seemingly violated by quantum effects.
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