Speaker
Ogan Ozsoy
(S)
Description
**High-scale supersymmetry (SUSY) with a split spectrum has become increasingly interesting
given the current experimental results. A SUSY scale above the weak scale could be
naturally associated with a heavy unstable gravitino, whose decays populate the dark matter
(DM) particles. In the mini-split scenario with gravitino at about the PeV scale and the
lightest TeV scale neutralino being (a component of ) DM, the requirement that the DM relic
abundance resulting from gravitino decays does not overclose the Universe and satisfies
the indirect detection constraints demand the reheating temperature to be below** $\small 10^9$-$\small 10^{10}~\rm{GeV}$. **On the other hand, the BICEP2 result prefers a heavy inflaton with mass at around** $\small 10^{13}~\rm{GeV}$ **and a reheating temperature at or above $\small 10^9~\rm{GeV}$ with some general assumptions. The mild tension could be alleviated if SUSY scale is even higher with the gravitino mass above the** $\small~\rm{PeV}$ **scale. Intriguingly, in no-scale supergravity, gravitinos could be very heavy at about** $\small 10^{13}~\rm{GeV}$, **the inflaton mass scale, while gauginos could still be light at the $\small \rm{TeV}$ scale.**
Primary author
Prof.
JiJi Fan
(Syracuse University)
Co-authors
Ms
Bithika Jain
(Syracuse University)
Ogan Ozsoy
(S)
