Quantum Breaking of de Sitter and Implications for Model Building
by
Sebastian Zell(Ludwig-Maximilians-Universitat, Max Planck Institute For Physics (Munich))
→
Europe/Berlin
313
313
Description
The quantum break-time is the timescale after which a system can no longer be described classically. In this talk, I will first introduce this concept using a simple example of a scalar field [1, 2] and then discuss implications for cosmic axions [2]. Subsequently, I will turn to de Sitter [1]. Once the spacetime itself is viewed as expectation value of an underlying quantum state, a finite quantum break-time emerges. The consistency condition of avoiding quantum breaking leads to a new class of constraints for model building. By excluding any theory with a metastable de Sitter vacuum, it rules out spontaneously-broken discrete symmetries [3] and makes the axion solution to the strong CP problem mandatory [4]. Moreover, it results in restrictions on inflation similar to the de Sitter swampland conjecture [5].
Based on:
[1] G. Dvali, C. Gomez and S. Zell, Quantum Break-Time of de Sitter, JCAP 1706 (2017) 028, arXiv:1701.08776.
[2] G. Dvali and S. Zell, Classicality and Quantum Break-Time for Cosmic Axions, JCAP 1807 (2018) 064, arXiv:1710.00835.
[3] G. Dvali, C. Gomez and S. Zell, Discrete Symmetries Excluded by Quantum Breaking, arXiv:1811.03077.
[4] G. Dvali, C. Gomez and S. Zell, A Proof of the Axion?, arXiv:1811.03079.
[5] G. Dvali, C. Gomez and S. Zell, Quantum Breaking Bound on de Sitter and Swampland, arXiv:1810.11002.
