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On the degrees of freedom of R$^{2}$ gravity in flat spacetime / Hell, Anamaria (Tokyo U., IPMU) ; Lust, Dieter (Munich U. ; Munich, Max Planck Inst.) ; Zoupanos, George (Munich, Max Planck Inst. ; Natl. Tech. U., Athens ; CERN ; Heidelberg U.)
We study the degrees of freedom of $R^2$ gravity in flat spacetime with two approaches. By rewriting the theory a la Stueckelberg, and implementing Lorentz-like gauges to the metric perturbations, we confirm that the pure theory propagates one scalar degree of freedom, while the full theory contains two tensor modes in addition. [...]
arXiv:2311.08216; LMU-ASC 34/23; MPP-2023-256.- 2024-02-07 - 36 p. - Published in : JHEP 2402 (2024) 039 Fulltext: 2311.08216 - PDF; Publication - PDF;

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On the Ghost Problem of Conformal Gravity / Hell, Anamaria (Munich U., ASC) ; Lust, Dieter (Munich U., ASC ; Munich, Max Planck Inst.) ; Zoupanos, George (CERN ; Heidelberg U.)
We study the metric perturbations around the de Sitter and Minkowski backgrounds in Conformal Gravity. We confirm the presence of ghosts in both cases. [...]
arXiv:2306.13714; CERN-TH-2023-116; LMU-ASC 21/23; MPP-2023-134.- 2023-08-24 - 24 p. - Published in : JHEP 2308 (2023) 168 Fulltext: 2306.13714 - PDF; document - PDF;

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