We consider dark energy cosmology in a de Sitter universe filled with quantum conformal matter. Our model represents a Gauss-Bonnet model of gravity with contributions from quantum effects. To the General Relativity action an arbitrary function of the GB invariant, f(G), is added, and taking into account quantum effects from matter the cosmological constant is studied. For the considered model ...

In any quantum theory of gravity we do expect corrections to Einstein gravity to occur. Yet, at fundamental level, it is not apparent what the most relevant corrections are. We argue that the generic curvature square corrections present in lower dimensional actions of various compactified string theories provide a natural passage between the classical and quantum realms of gravity. The Gauss-Bo...

We investigate the linearized gravity on a single de Sitter brane in the anti-de Sitter (AdS) bulk in the Einstein Gauss-Bonnet (EGB) theory. We find that the Einstein gravity is recovered for a high energy brane, i.e., in the limit of the large expansion rate, Hl ≫ 1, where H is the de Sitter expansion rate and l is the curvature radius of the AdS bulk. We also show that, in the short distance...

We review the topic of 4D Einstein-Gauss-Bonnet gravity, which has been subject considerable interest over past two years. Our begins with a general introduction to Lovelock's theorem, and Gauss-Bonnet terms in action for gravity. These areas are fundamental importance understanding modified theories inform our subsequent discussion recent attempts include effects term four space-time dimension...

In this work, gravitational phase transition emerging from anti de-Sitter (AdS) to (dS) vacua in Einstein-Gauss-Bonnet-massive gravity (EGBMG) is considered. We determine the location of thermalon (a static bubble solution Euclidean space) which exists casually connected two regions spacetime. The plays a major role by inducing decay negative effective cosmological constant positive one due hig...

We consider perturbative solutions in Einstein gravity with higher-derivative extensions and address some subtle issues of taking extremal limit. As a concrete new result, we construct the rotating black hole five dimensions equal angular momenta $J$ general mass $M$ Einstein-Gauss-Bonnet gravity, up to including linear order standard Gauss-Bonnet coupling constant $\alpha$. obtain near horizon...

We investigate the presence of a black hole string phase transition in Einstein Gauss Bonnet (EGB) gravity large dimension limit. The merger point is static spacetime connecting with phase. consider several ranges Gauss-Bonnet parameter. find that there range when corrections are subordinate to terms limit, and yet geometry does not approach away from neck. cannot rule out topology changing as ...

Abstract In this paper we study uncharged, non-conformal and anisotropic systems with strong interactions using the gauge-gravity duality by considering Einstein-Quadratic-Axion-Dilaton action in five dimension. fact would like to gain insight into influence of higher derivative gravity on QCD system. At finite temperature, obtain an black brane solution a 5D Einstein–Gauss–Bonnet-Axion-Dilaton...