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Within the MSSM we propose the chaotic inflationary scenario in which theinflaton field is a combination of sleptons and the Higgs field states evolvingalong the $D$-term flat direction. In the inflation and postinflation reheatingprocesses, a decisive role is played by the MSSM Yukawa superpotential. Thevacuum energy during the inflationary era is mainly from the muonic Yukawacoupling, while the inflaton decay and subsequent reheating process dominantlyproceeds due to the strange quark Yukawa term. Because of these, the presentedscenario is predictive and the results obtained agree well with cosmologicalobservations. In particular, the scalar spectral index and the tensor-to-scalarratio are respectively, $n_s\simeq 0.966$ and $r=0.00117$. The reheatingtemperature is found to be $T_r\simeq 7.2\times 10^7$ GeV.

Chaotic Inflation from the MSSM Along Flat $D$-Term Trajectory