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5 papers found.
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Mass-induced instability of SAdS black hole in Einstein–Ricci cubic gravity

We perform the stability analysis of Schwarzschild-AdS (SAdS) black hole in the Einstein–Ricci cubic gravity. It shows that the Ricci tensor perturbations exhibit unstable modes for small black holes. We call this the mass-induced instability of SAdS black hole because the instability of small black holes arises from the massiveness in the linearized Einstein–Ricci cubic gravity...

Comment on “Quantum massive conformal gravity” by F. F. Faria

In a recent paper in EPJC doi:10.​1140/​epjc/​s10052-016-4037-5, Faria has shown that quantum massive conformal gravity is renormalizable but has ghost states. We comment this paper on the aspect of renormalizability.

Scale-invariant power spectra from a Weyl-invariant scalar–tensor theory

We obtain scale-invariant scalar and tensor power spectra from a Weyl-invariant scalar–tensor theory in de Sitter spacetime. This implies that the Weyl invariance guarantees the implementation of the scale invariance of the power spectrum in de Sitter spacetime. We establish a deep connection between the Weyl invariance of the action and the scale invariance of the power spectrum...

Cosmological singleton gravity theory and dS/LCFT correspondence

We study the evolution of cosmological perturbations generated during de Sitter inflation in the singleton gravity theory. This theory is composed of a dipole pair in addition to tensor. We obtain the singleton power spectra which show that the de Sitter/logarithmic conformal field theory (dS/LCFT) correspondence works for computing the power spectra in the superhorizon limit...

Thermodynamic and classical instability of AdS black holes in fourth-order gravity

Yun Soo Myung 0 Taeyoon Moon 0 0 Institute of Basic Science and Department of Computer Simulation, Inje University , Gimhae 621-749, Korea We study thermodynamic and classical instability of AdS