Journal
PHYSICAL REVIEW D
Volume 93, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.93.064076
Keywords
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Funding
- MIUR-FIRB Grant [RBFR12H1MW]
- Agence Nationale de la Recherche [ANR 2010 BLANC 0413 01]
- ERC Starting Grant [278234]
- Sloan Research Fellowship
- DOE Early Career Award [DE-SC0010255]
- Hertz Graduate Fellowship
- NSF Graduate Research Fellowship [DGE-1144469]
- Aspen Center for Physics
- Munich Institute for Astro- and Particle Physics (MIAPP) of the DFG cluster of excellence Origin and Structure of the Universe
- European Research Council (ERC) [278234] Funding Source: European Research Council (ERC)
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We derive rigorous bounds on corrections to Einstein gravity using unitarity and analyticity of graviton scattering amplitudes. In D >= 4 spacetime dimensions, these consistency conditions mandate positive coefficients for certain quartic curvature operators. We systematically enumerate all such positivity bounds in D = 4 and D = 5 before extending to D >= 6. Afterwards, we derive positivity bounds for super-symmetric operators and verify that all of our constraints are satisfied by weakly coupled string theories. Among quadratic curvature operators, we find that the Gauss-Bonnet term in D >= 5 is inconsistent unless new degrees of freedom enter at the natural cutoff scale defined by the effective theory. Our bounds apply to perturbative ultraviolet completions of gravity.
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