Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.051601
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Funding
- Sloan Research Fellowship
- DOE [DE-SC0010255]
- Hertz Graduate Fellowship
- NSF [DGE-1144469]
- U.S. Department of Energy (DOE) [DE-SC0010255] Funding Source: U.S. Department of Energy (DOE)
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We study the Gauss-Bonnet (GB) term as the leading higher-curvature correction to pure Einstein gravity. Assuming a tree-level ultraviolet completion free of ghosts or tachyons, we prove that the GB term has a nonnegative coefficient in dimensions greater than 4. Our result follows from unitarity of the spectral representation for a general ultraviolet completion of the GB term.
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