On inflation and torsion in cosmology

In a recent letter by H. Davoudiasl, R. Kitano, T. Li and H. Murayama “The new Minimal Standard Model” (NMSM) was constructed that incorporates new physics beyond the Minimal Standard Model (MSM) of particle physics. The authors follow the principle of minimal particle content and therefore adopt the viewpoint of particle physicists. It is shown that a generalisation of the geometric structure of spacetime can also be used to explain physics beyond the MSM. It is explicitly shown that for example inflation, i.e. an exponentially expanding universe, can easily be explained within the framework of Einstein-Cartan theory. PACS numbers: 04.50.+h, 98.80.Jk