Speaker
Roberto Percacci
(SISSA)
Description
In particle physics the running couplings are used to solve the
problem posed by large logarithms, and they faithfully reproduce
the overall dependence of scattering amplitudes on the energy.
I will show that in certain circumstances the standard definition of
running couplings fails to satisfy these properties, and will give
the physically relevant definition.
This applies in particular to higher derivative gravity.
The physical running differs from the one that is known in the
literature and allows the theory to be asymptotically free without
tachyons.
Primary author
Roberto Percacci
(SISSA)
