11/22 2023 Seminar
- Title题目 Infinite derivative gravity as a strong UV completion candidate and its cosmological implications
- Speaker报告人 Alexey Koshelev (ShanghaiTech University)
- Date日期 2023年11月22日 10:00
- Venue地点 南楼6620
In my talk I will explain how higher and infinite derivatives naturally arise in a consideration of quantum properties of general gravity theories. I will construct the most general propagator around Minkowski and (anti)-de Sitter backgrounds proving that an infinite tower of derivatives is inevitable in order to exorcise ghosts. Then I will build on this explaining cosmological implications: modification of a tensor power spectrum, large non-Gaussianities, ideas towards observable primordial gravitational waves and related questions.