Gravitino or axino dark matter with reheat temperature as high as 1016GeV

A new scheme for lightest supersymmetric particle (LSP) dark matter is introduced and studied in theories of TeV supersymmetry with a QCD axion, a, and a high reheat temperature after inflation, TR. A large overproduction of axinos (ã) and gravitinos (G˜) from scattering at TR, and from freeze-in at the TeV scale, is diluted by the late decay of a saxion condensate that arises from inflation. The two lightest superpartners are ã, with mass of order the TeV scale, and G˜ with mass m3/2 anywhere between the keV and TeV scales, depending on the mediation scale of supersymmetry breaking. Dark matter contains both warm and cold components: for G˜ LSP the warm component arises from ã→ G˜ a, while for ã LSP the warm component arises from G˜ → ãa. The free-streaming scale for the warm component is predicted to be of order 1 Mpc (and independent of m3/2 in the case of G˜ LSP). TR can be as high as 1016 GeV, for any value of m3/2, solving the gravitino problem. The PQ symmetry breaking scale VPQ...