Canonical structure of minimal varying Λ theories

0554741 - FZÚ 2022 RIV GB eng J - Journal Article
Alexandrov, S. - Speziale, S. - Zlosnik, Thomas
Canonical structure of minimal varying Λ theories.
Classical and Quantum Gravity. Roč. 38, č. 17 (2021), č. článku 175011. ISSN 0264-9381. E-ISSN 1361-6382
R&D Projects: GA ČR(CZ) GA20-28525S
Institutional support: RVO:68378271
Keywords : background * symmetry: conformal * de Sitter
OECD category: Particles and field physics
Impact factor: 3.853, year: 2021
Method of publishing: Limited access
https://doi.org/10.1088/1361-6382/ac1852

Minimal varying Λ theories are defined by an action built from the Einstein–Cartan–Holst first order action for gravity with the cosmological constant Λ as an independent scalar field, and supplemented by the Euler and Pontryagin densities multiplied by 1/Λ. We identify the canonical structure of these theories which turn out to represent an example of irregular systems. We find five degrees of freedom on generic backgrounds and for generic values of parameters, whereas if the parameters satisfy a certain condition (which includes the most commonly considered Euler case) only three degrees of freedom remain. On de Sitter-like backgrounds the canonical structure changes, and due to an emergent conformal symmetry one degree of freedom drops from the spectrum.
Permanent Link: http://hdl.handle.net/11104/0329402