Perturbative Quantum Gravity: Diffeomorphisms, Observables and Noncommutativity | Dr. Markus Fröb
Автор: Math Club KUNIV
Загружено: 2022-11-04
Просмотров: 135
Описание:
Speaker: Dr. Markus Fröb, University of Leipzig, Germany
Title: Perturbative Quantum Gravity: Diffeomorphisms, Observables and
Noncommutativity
Abstract: Perturbative Quantum Gravity (pQG), the effective quantum
field theory of gravitational fluctuations around a given background, is
currently the only experimentally accessible theory of quantum gravity.
Its tree-level predictions, in the form of temperature fluctuations of
the Cosmic Microwave Background, have been experimentally confirmed, and it is possible that loop corrections are accessible to future
experiments. However, while the tree-level results are well understood
also from a theoretical point of view, the diffeomorphism symmetry of
gravity makes the construction of invariant observables very difficult
beyond this. Only recently, this issue has been overcome, and a class of
causal invariant observables has been constructed. I will discuss this
construction and how it can be related to observations, and present some
predictions of pQG for graviton loop corrections to the Newtonian
gravitational potential and the Hubble rate, the local expansion rate of
the universe. Lastly, I show that pQG also predicts that spacetime
becomes non-commutative at the Planck scale, but in a different way from
previous approaches.
The talk is based (in particular) on the recent papers arXiv:1806.11124,
2108.11960, 2109.09753 and 2207.03345.
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