Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-05-28
Phys.Rev.D82:104022,2010
Physics
High Energy Physics
High Energy Physics - Theory
26 pages, 7 figures, harvmac. v2: added refs; clarified Regge discussion
Scientific paper
10.1103/PhysRevD.82.104022
We investigate features of perturbative gravity and supergravity by studying scattering in the ultraplanckian limit, and sharpen arguments that the dynamics is governed by long-distance physics. A simple example capturing aspects of the eikonal resummation suggests why short distance phenomena and in particular divergences or nonrenormalizability do not necessarily play a central role in this regime. A more profound problem is apparently unitarity. These considerations can be illustrated by showing that known gravity and supergravity amplitudes have the same long-distance behavior, despite the extra light states of supergravity, and this serves as an important check on long-range dynamics in a context where perturbative amplitudes are finite. We also argue that these considerations have other important implications: they obstruct probing the conjectured phenomenon of asymptotic safety through a physical scattering process, and ultraplanckian scattering exhibiting Regge behavior. These arguments sharpen the need to find a nonperturbative completion of gravity with mechanisms which restore unitarity in the strong gravity regime.
Andersen Jeppe R.
Giddings Steven B.
Schmidt-Sommerfeld Maximilian
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