4-Derivative gravity provides a renormalizable theory of quantum gravity at the price of introducing a physical ghost, which could admit a sensible positive-energy quantization. To understand its physics, we compute ghost-mediated scatterings among matter particles at tree-level, finding a new power-like infra-red enhancement typical of 4-derivative theories, that we dub ghostrahlung'. Super-Planckian scatterings get downgraded to Planckian by radiating hard gravitons and ghosts, which are weakly coupled and carry away the energy.
Salvio, A., Strumia, A., Veermae, H. (2018). New infra-red enhancements in 4-derivative gravity. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 78(10), 842 [10.1140/epjc/s10052-018-6311-1].
New infra-red enhancements in 4-derivative gravity
Salvio A.;
2018-10-20
Abstract
4-Derivative gravity provides a renormalizable theory of quantum gravity at the price of introducing a physical ghost, which could admit a sensible positive-energy quantization. To understand its physics, we compute ghost-mediated scatterings among matter particles at tree-level, finding a new power-like infra-red enhancement typical of 4-derivative theories, that we dub ghostrahlung'. Super-Planckian scatterings get downgraded to Planckian by radiating hard gravitons and ghosts, which are weakly coupled and carry away the energy.| File | Dimensione | Formato | |
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