Positivity of Curvature-Squared Corrections in Gravity.
نویسندگان
چکیده
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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ورودعنوان ژورنال:
- Physical review letters
دوره 118 5 شماره
صفحات -
تاریخ انتشار 2017