Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2012-04-17
Physics
High Energy Physics
High Energy Physics - Theory
9 pages
Scientific paper
We explicitly confirm the expectation that generic Lovelock gravity in D dimensions has a unitary massless spin-2 excitation around any one of its constant curvature vacua just like the cosmological Einstein gravity. The propagator of the theory reduces to that of Einstein's gravity, but scattering amplitudes must be computed with an effective Newton's constant which we provide. Tree-level unitarity imposes a single constraint on the parameters of the theory yielding a wide range of unitary region. As an example, we explicitly work out the details of the cubic Lovelock theory.
Gullu Ibrahim
Sisman Tahsin Cagri
Tekin Bayram
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