Speaker
Prof.
Ilya Shapiro
(Universidade Federal de Juiz de Fora)
Description
Recently there were some advances in the higher-derivative
gravity theories and my purpose is to give the brief survey
of our results. First of all, it was shown that the theory
with six or more derivatives in the action, which has only
complex ghost-like poles, has a unitary S-matrix in the
Lee-Wick sense. Second, it was shown that in this class of
theories the magnitudes of the masses of the ghost-like
states can not be reduced by a gravitational version of the
see-saw mechanism. Third, even if the masses are huge, there
may be a chance to design an indirect texts for higher
derivatives from the astrophysical observations.
| Overview or Regular Talk? | Regular: 45 min. |
|---|
Author
Prof.
Ilya Shapiro
(Universidade Federal de Juiz de Fora)
