期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.101302
关键词
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资金
- Division Of Physics
- Direct For Mathematical & Physical Scien [0757190] Funding Source: National Science Foundation
Canonical analysis of a recently proposed linear+quadratic curvature gravity model in D=3 establishes its pure, irreducibly fourth derivative, quadratic curvature limit as both ghost-free and power-counting UV finite, thereby maximally violating standard folklore. This limit is representative of a generic class whose kinetic terms are conformally invariant in any dimension, but it is unique in simultaneously avoiding the transverse-traceless graviton ghosts plaguing D > 3 quadratic actions as well as double pole propagators in its other variables. While the two-term model is also unitary, its additional mode's second-derivative nature forfeits finiteness.
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