A comment on gravitational waves and the scale of supersymmetry breaking Speaker(s): Alexander Westphal
Abstract:
It has been suggested, by Kallosh and Linde, that a generic bound on inflation in string theory keeps the
Hubble scale of inflation $H$ smaller than the gravitino mass, $m_{3/2}$. Given that models with lowenergy supersymmetry have $m_{3/2}$ smaller than a TeV, this is a severe constraint, and would suggest that one is forced to choose between highscale inflation and lowscale supersymmetry. The bound arises by considering possible decompactification instabilities of the extra (compactified) dimensions of string theory, during the inflationary epoch. I explain the arguments that give rise to such a bound, and describe recent work with T. He and A. Westphal exhibiting largefield chaotic inflation models in stringinspired supergravities that have $H >> m_{3/2}$ but avoid decompactification. I conclude that even within the framework of string theory, highscale inflation and lowenergy supersymmetry may well be compatible.
Date: 16/06/2010  3:45 pm
