Landscape versus Swampland for Higher Derivative Gravity
Sho Yaida
TL;DR
This paper reviews recent research on Gauss-Bonnet gravity and its dual conformal field theories, focusing on holographic properties, causality, and constraints that distinguish consistent theories from the swampland.
Contribution
It provides a comprehensive survey of how higher derivative gravity theories relate to boundary CFT properties and identifies criteria that separate viable theories from the swampland.
Findings
Gauss-Bonnet gravity affects viscosity bounds in dual CFTs
Holographic studies reveal causality and unitarity constraints
Some gravitational theories are classified as swampland due to inconsistencies
Abstract
We survey recent studies of Gauss-Bonnet gravity and its dual conformal field theories, including their relation to the violation of the Kovtun-Starinets-Son viscosity bound. Via holography, we can also study properties such as microcausality and unitarity of boundary field theory duals. Such studies in turn supply constraints on bulk gravitational theories, consigning some of them to the swampland.
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