2015/05/31 by Xavier Calmet, Djuna Croon, Christopher Fritz
Physics and Astronomy · #Cosmology and Gravitation Theories #Doubly special relativity #Four-force #Galaxies: Formation, Evolution, Phenomena #General relativity #Noncommutative and Quantum Gravity Theories #Observable #Problem of time #Quantum field theory #Quantum gravity #Tests of special relativity #Theory of relativity #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1140/epjc/s10052-015-3838-2
arxiv created 2015/08/12 · openalex publication_date 2015/12/01 · arxiv updated 2016/01/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We show that general relativity coupled to a quantum field theory generically leads to non-local effects in the matter sector. These non-local effects can be described by non-local higher dimensional operators which remarkably have an approximate shift symmetry. When applied to inflationary models, our results imply that small non-Gaussianities are a generic feature of models based on general relativity coupled to matter fields. However, these effects are too small to be observable in the cosmic microwave background.