Within the MSSM we propose the chaotic inflationary scenario in which the inflaton field is a combination of sleptons and the Higgs field states evolving along the D -term flat direction .
In the inflation and postinflation reheating processes , a decisive role is played by the MSSM Yukawa superpotential .
The vacuum energy during the inflationary era is mainly from the muonic Yukawa coupling , while the inflaton decay and subsequent reheating process dominantly proceeds due to the strange quark Yukawa term .
Because of these , the presented scenario is predictive and the results obtained agree well with cosmological observations .
In particular , the scalar spectral index and the tensor-to-scalar ratio are respectively , n _ { s } \simeq 0.966 and r = 0.00117 .
The reheating temperature is found to be T _ { r } \simeq 7.2 \times 10 ^ { 7 } GeV .