  In the first Lecture, the Big Bang and the Standard Model of particle physics
are introduced, as well as the structure of the latter and open issues beyond
it. Neutrino physics is discussed in the second Lecture, with emphasis on
models for neutrino masses and oscillations. The third Lecture is devoted to
supersymmetry, including the prospects for discovering it at accelerators or as
cold dark matter. Inflation is reviewed from the viewpoint of particle physics
in the fourth Lecture, including simple models with a single scalar inflaton
field: the possibility that this might be a sneutrino is proposed. Finally, the
fifth Lecture is devoted to topics further beyond the Standard Model, such as
grand unification, baryo- and leptogenesis - that might be due to sneutrino
inflaton decays - and ultra-high-energy cosmic rays - that might be due to the
decays of metastable superheavy dark matter particles.
